I was in the hospital one time many years ago and my roommate snored very loud and one night his snoring hit a resonant frequency and a picture on the wall started vibrating. I'm not kidding either.
That Schlieren optics shot was beautiful. That strange, ghostly glow around the objects and the mirror looking like a window that looks out into space. Wow.
@@iphgfqweio As a matter of fact, it will be very useful for me. I'm a game developer and we will use that mechanic in our upcoming game. We will tweak it to fit our gameplay necessities, but it will be exactly that, on a very large scale. For one of the puzzle in the game at least.
I am an engineer... And wave physics was always a part of study... We have to apply it in real life... Did You know that even the springs of the coaches of Indian Railways have a frequency near 128Hz so that everybody can sleep pleacefully despite all that noises in a train
This guy: "Even though I can't hear it I'm still going to use ear protection." Our generation: "Even though I'm bleeding from my ears I'm gonna turn up that bass."
I've seen multiple videos about Acoustic Levitation, though this is the first one I've seen made with a reflector instead of a second speaker. I've also seen multiple videos about Schlieren optical photography, most notably looking at the shockwaves produced by a bullet breaking the sound barrier. This is, however, the first video I've seen that combines the two, and I quite like it. Well done.
awesome to see someone doing this with schlieren imaging, I haven't seen anyone else on youtube doing that before, and it's really cool to be able to actually 'see' what's happening!
I don't get it. The title says "Ultrasonic Levitation" and the video demonstrates ultrasonic levitation, but still 264 people disliked the video. What were they expecting?!
its not limited to little styrofoam balls lol. this is just a glimpse at whats possible. look into the ancient traditions of sound moving rocks and boulders. ancient cataclysm and pre deluvian civilisations
Saken Kenzhegulov nope😂 it wouldn't..if he doesn't exactly hit that resonance frequency it will just vibrate with the other frequency but with a way lower amplitude..and that's the problem. thinner glass is easier to get to vibrate so it takes more energy up. I guess thicker glass just reflects it better.
How does this represents wave-particle duality? This is just simple example of transverse wave experiencing resonance (constructive interference). Wave particle duality was at first just plain and simple hypothesis given by de Broglie's own thought experiments.
Wait what? I am afraid you have no idea what you are talking about. This is a concept of ultrasonic levatation, the "waves" you are seeing is the waveform generated from the ultrasonic sound creating gaps of high and low pressure that can suspend ultra light objects. Literally the transducer or speaker at the bottom generated high frequency sound that creates pockets of high pressure capable of suspending light small objects. Wave-particle duality has to do with quantum particles. The best demonstration would be the double slit experiment. Again the difference is one thing deals with small macro objects being suspended by macro sound waves that have nothing to do with the objects. The other(wave particle duality) has to do with quantum particles(that for all intents and purposes you can't see) and those quantum particles in some cases act completely like particles and in other act as a distribution of possibilities represented as a possibility wave distribution. Quantum objects and ultrasonic levatation have nothing to do with each other
lol.. you will be pleased to know the human eye is capable of seeing what that "mirrior" is showing ;) when you see the "heat waves" coming off the road in the distance while driving on a hot day. thats it. just focus differently on things like your finger tips and you will see those same heat looks coming off your hands like came off his in the video
The audio codec used by youtube has a low-pass filter at around 17 kHz. The dynamic range is also very limited, so nothing harmful could get through. Videos that scare headphone users tend to have an extremely low overall audio level. The user then turns up the volume (which also increases the noise, which should be a warning) and then someone bumps the microphone. Imagine the opening scene from "Back to the Future": ua-cam.com/video/3isQI0nXQRE/v-deo.htmlm20s No worries, I still liked the joke with the dog. I actually imagined the dogs in his neighborhood starting to howl and everybody is confused why they are doing this. ;)
Please don’t make these jokes, most scientist take high respect for science (that’s why their scientists). And to call them magicians is like saying everything they are doing is just a small little party magic trick.
Already knows the concept but seeing in practical was just awesome . Feel like my question that I asked my physics professor he should have shown me this instead of just saying yes that can happen. UA-cam why don't you always these awesome videos to me
Great demo, proves the potential of levitation by these means, now all we need is a few hundred years to perfect the technique that our very ancient predecessors used thousands of years ago !! We have a LOT to learn !!
That's freaking badass! What a great idea to use a schlieren projector. I've known about this phenomenon for years but it never occurred to me to visualize it like this. Absolutely f****** awesome! So happy. 😁
While using my power saw sometimes it would hit a certain frequency that made me feel like I was levitating. I always thought what you are doing was possible through my experience while sawing that wood!
Yep. There is some well deserved controversy over this recently. There are some parks in Philly that are playing loud high pitched noises in the park all night. It's supposed to be inaudible to everyone except kids and young adults, so it's basically used to keep kids away from the park at night. But that just means an adult could walk by and have their ears fucked up without having a clue. It's literally sonic warfare against its own citizens to keep kids out of parks at night... the device is called the mosquito and they need to be removed and/or destroyed. And whoever's idea that shit was should be removed from their position and sued
Our choir in school once managed to hit the resonant frequence of a window perfectly so it started vibrating. Our teacher then explained us what happened. I wish he would have shown us your video, it would have been perfect to visualize the effect!
One of the coolest demonstrations..loved it!!! We have to perform such demonstrations in schools for young students especially in counties like India(my country) where a lot of rote learning is going on... Many would become 'truely' curious and develop scientific temper.
THAT IS TRULY AMAZING.I THINK THE WORD CYMATICS COMES TO MIND. ONE COULD SAY THIS IS THE STRUCTURE OF THE UNIVERSE,INTERFERRANCE PATTERNS OF DIFFERENT SOUND-VIBRATION,S...OMM.
wouldn´t the bright lines be the low pressure area? Your explanation did make sense, but my thinking is this: the ball would be "sucked" into lower pressure areas and the high pressure above and below the ball would prevent it from going anywhere. since I assume, that i am in the wrong here :D , i would love, if you could take the time to further explain where my thinking is flawed! regards from germany!
Yeah it made more sense to me too that the ball would settle in one of the low pressure areas. An explanation (from anyone who knows how this works) would be great.
I might be wrong but when he says high and low pressure it means high and low pressure variation. So at a spot of high pressure, pressure oscillate a lot between a pressure above atmospheric pressure and below atmospheric pressure. Whereas on a spot of low pressure, pressure hardly change over time.
There are 2 different descriptions for sound. One is a pressure wave, that is literally the variation of the physical quantity pressure. And the other is a displacement wave, that is the actual movement of the air. These two waves are out of phase with each other. The nodes of one wave (the zero points) coincide with the anti nodes (points of maximum amplitude) of the other wave. So the regions of highest pressure variation are actually regions of least air movement. It is at these displacement nodes that the beads settle down.
I saw the same thing using microwaves back in the mid-1980s. Objects could be held static with specific frequencies of microwaves. It was an 8 mm film that was quite interesting to watch.
Incredible demonstration. I would like to see other configurations like three ultrasonic horns/reflectors configured with a computer controlling the amplitude and frequency, or three horns/reflectors to manipulate a lens or a drop of glue suspended in the standing waves.
Awesome! During the first half of the video, I had this idea that the balls would rest in the low density regions, sitting atop the high density planes of air, so I'm glad for the schlieren setup. It took a fair bit of thought to (maybe) understand what is going on.
It's not that easy, though. The reason why the balls fluctuate is because there's a non-linear term on the sound pressure equation that doesn't cancel out (generating a net force upwards). It's not straightforward! If you think, since the waves generate pressure both positive and negative in the anti-nodes, the average resulting force should be zero, as the sound is oscillating much more rapidly than the ball can respond. It's fascinating, I myself don't understand that well but if you're interested you can look it up.
I am too young to get this.. Aren’t the balls suppoused to sit in the low-pressure point, since everything is naturally going from the high-pressured points to the low pressured points? Just like in a balloon, air moves out, because there is more pressure within the balloon.
So hypothetically if you could construct the speaker device to be very large or even more than one device in a vehicle and faced it downwards using the Earth as the reflector could you theoretically have created a levitating vehicle, a levitating aircraft that could travel within those high pressure bands at will, continually using the Earth as the sound reflector?
I think this would work with two rotating electromagnetic coils and depending on the ultrasonic frequency strength you can both cancel out gravity and dial in the desired height locally! Just make sure the ultrasonic frequency is active inside the coil to interact with the coil's electromagnetic spin!
That will not work. The sound waves need to be bounced back upon themselves at the right distance, for them to give this effect. Creating a moving vehicle out of this principle would be much more complicated and would require an impractical amount of energy.
Warmonger of Warsong how will that make it fly? I could see how the compartment above the mirror would levitate but wouldnt the whole thing just drop to the ground due to there not being any standing ways between the speaker and the ground? And also what kind of crazy power would you need to generate waves powerful enough to lift that wave when a normal speaker can lift about 5 water droplets?
First off, thank you. This is one of the best acoustic levitation demonstrations on the web. As is the schlieren optics portion in this and in Daniel's video. The amplitude of the pressure waves shown with the schlieren setup was impressive. This was not covered on in the presentations section on Harvard's site so I was hoping you could give a brief description of the amplifier used and the matching transformer in the back ground that appears to be a self wound ferrite core.
The amplifier is a Samson Servo 120 audio power amp. A home-made impedance matching transformer couples the 8-ohm output to the ultrasonic transducer. The core of the transformer consists of two C-shaped pieces of ferrite which, when put together make a square. Ferrite is better than iron at high frequencies. The primary is 10 turns of #18 wire and the secondary is 100 turns of #22 wire. The inductance of the primary is 230 microH w/ secondary open and 16 microH w/ secondary shorted. It's operational inductance is such that its impedance is well matched to the 8-ohm output of the amp. The inductance of the secondary is 18.8 mH w/ pri open and 1.8 mH w/ pri shorted. It's operational inductance is around 10 mH. The static capacitance of the transducer is 3550 pF. To resonate at 28 kHz, we want an inductance of 9.1 mH. The inductance of the secondary is a close match for that. The "speaker" is an ultra-sonic power transducer (designed for ultra-sonic cleaning baths) such as one of these: www.americanpiezo.com/standard-products/ultrasonic-power-transducers.html The one I'm using is the 50-watt version (but I'm only operating it at around 8 watts). Hope that helps. Thank you for your kind words about the video.
Thank you for the quick reply and detailed information. I was heading down the path of implementing some type of impedance matching and your example helps a lot. I wanted it mainly to get the most power at resonance but also to prevent resonance at a frequency other than what the transducer is expecting which is an issue with this amplifier (Pyle PT210) using the 70V output. My setup (for a demonstration in my daughters 6th grade science class) was inspired by yours except I am using an iPhone on an XY translation stage. Thanks again and happy sciencing! :) www.thingiverse.com/make:382484
Nice. I never heard about something similar. If you put another Ultrasonic-Loudspeaker to the side, is it possible to move the balls along the highpressurezone?
@@scherenschnitt6333 Tesla was working with longitudinal waves, aka sound waves and actually was famous for it. Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Even more he is known for its experiments of propulsion based on longitudinal (sound waves). Therefore this seems nothing new but recycled Tesla work.
I would like to see acoustic levitation of objects done via electric wave instead of sound wave which i think is doable in theory. I think it can be done with top loads of two Tesla Coils pointed at each other while operating 180 degree out of phase to each other and creating nodes and anti-nodes in space between the two top loads. You will likely need to rectify AC or DC to Tesla's LC (Longitudinal Current) first so you can have electric wave behaving like a sound wave. For circuit diagram to produce LC/LMD wave, google "The L.M.D./T.E.M.Test - JLN Labs" and for demonstration of Tesla's longitudinal electric waves, google "Transverse & Longitudinal Electric Waves and Tesla’s Longitudinal Electricity" by electrical engineer Eric Dollard. Longitudinal electricity has electric field and magnetic field flowing in same direction as you can see in this video "Replication of Eric Dollard's Analog Computer". You can easily measure it with Trifield meter.
I hope I live long enough to see this technology enter mainstream usage. It could have any number of applications, cooking, manufacturing, VR, who knows.
Flying cars already exist. But why would we issue them if we can even use a blinker and end up causing 30 car pile ups? No one wants a flying car barreling into their house. Once autopilot has been fully flushed out then I assume the next steps are how to get them for practical use on flying cars and building virtual roadways to plot courses. So human don’t have to cause so many unnecessary negligence deaths
Sure is. They used tech very similar to this levitation. That's why they had cubits measurements in the blocks, they had to be a certain size. Wait till people also find out that it only took a couple of hours to build them, AAAAAND they were built from the top down :). Now off you all go down a rabbit ole :D
The mirror is part of a schlieren setup, which bounces light back on its original path and can show density changes in the air. At 2:48 you can see that the warm air rising off his hands is visible as if it were fumes, but its just the change of refractive index due to the density change. The optics are there just to show the standing waves, the acoustic effects don't need the optics.
@@r0cketplumber yeah, but my question was if the mirror needed a light frequency to be able to reflect back the waves...already found the answer and the answer is yes, more than a specific light frequency, it needs a one pointed source of light and a sharp obstruction before it hits the mirror, without it the mirror does not reflect the waves.
If a small device was emitting a sound such as this, and was in the atmosphere (in the clouds), would the water in the clouds cause some kind reverb? Similar to the glass, but less powerful? And would that reverb be enough to make the device levitate? Someone smart point out the flaws in this idea cus I don’t research I just think 💀💀💀
Not completely sure but here’s what I think. I dont think a cloud would provide much reverb for 2 reasons 1. It is simply to far away and it would take forever for it to come back and by the time it did it wouldn’t be enough pushback for it to float a small object as most of the sound waves would probably have spread out. 2. A cloud is not solid and does not provide the reverb for the object to float, Pretty certain for this to actually work you need a solid object to bounce the sound wave off of. Thanks for coming to my TEDTalk
@@xxochitla7166 the thing is, sound is reflected by a phase difference of 180 degrees, when incident on a denser medium from a rarer medium. ( here see, the glass is more dense than air, so it's able to reflect by a phase difference of 180, which is responsible for the effective superposition of the sound waves, resulting in the effective production of stationary waves.) , since water is more denser than air, so yes, we can have the same effect with clouds too theoretically ( U might ask then why are they able to float, that is explained by the buoyant force experienced by the cloud surface due to air. Now the reason being it's too hard to experiment with is that : Here we kept the glass surface fixed at that particular position ( which should be a multiple of half the wavelength to achieve the case of standing waves.) On the surface of clouds, the air particles striking with the clouds will create pressure on it, and that pressure will result in upward force on clouds which will increase the distance between the cloud and the surface of earth. And one more reason for this to be hard to achieve is that, the velocity if sound depends on the temperature of medium in which it propagates, and temperature of earth atmosphere decreases as we go up. So the speed of sound will also become variable, which will make the wavelength a variable. Theoretically it's possible because there we take many assumptions as to this cannot happen, the clouds are fixed, and that the velocity will not change, but practically it's very very difficult.
Amish are non violent and don't have a death penalty. Where do you get your information? The only one chopping off hands and rejecting science are the same ones who follow the Koran. Most religions are very peaceful, contrary to what Cultural Marxism has taught most (dumb) Occidental youth.
@@myopicseer I am surprised you could be so aware and yet so naive> Koran followers do not reject science. Science and spirituality are the same in Hebrew - and not all Hebrew speaking people follow Koran, Quran or Torah, but in essence, ALL religions know same, protect same, occult sAme. But you can find it if you want to. Hebrew is based on mathematics and scared geometry. Really surprised you chose to single out Koran. Look into "tree of life."
why do they sit in the high pressure zones? i would have thought they would sit in the low pressure ones
Actually the objects are trapped in the nodes of the standing pressure wave. See doi.org/10.1119/10.0002764
It's really a great job to show a sound wave in real life
It's called schlieren imaging
@@oppy8811 Yeah I recently googled it
@SALINA AJAYKUMAR I 😘 😘 .
i
.:.
I see what you mean.
Put your hand in front of your mouth and scream loud + long.... You can feel the vibration and that is another way too.
I never thought i would get to literally see a sound wave! Thank you for this!
ua-cam.com/video/wvJAgrUBF4w/v-deo.html
Just do psychedelics and you'll be seeing all sorts of wave, sound wave included
I was in the hospital one time many years ago and my roommate snored very loud and one night his snoring hit a resonant frequency and a picture on the wall started vibrating. I'm not kidding either.
😦
Is that even possible?
@@ulysse3254 Yeah, Ive done that with instruments but I guess you can do it vocally too...
@@user-hk8yp7cw1v wow that would be amazing
That Schlieren optics shot was beautiful. That strange, ghostly glow around the objects and the mirror looking like a window that looks out into space. Wow.
Ya it was cool
the last ball to fall reminded me of tom and jerry when tom realizes he is in the air.
Wile E. Coyote in almost all the Road Runner cartoons 🤪
Lmao 😂
Dude same lmao
even in the deepest regions of Afghanistan, Iraq, Iran, Syria, Somalia, North Korea, Cuba, only this cartoon can make them laugh 😂🤣
Crystal clear explanation, demonstration and overall presentation. Doesn't get much better than this :)
Probably the most useful video I ever saw on youtube.... Amazing...
amazing?y interesting?y useful?n
@@iphgfqweio As a matter of fact, it will be very useful for me. I'm a game developer and we will use that mechanic in our upcoming game. We will tweak it to fit our gameplay necessities, but it will be exactly that, on a very large scale. For one of the puzzle in the game at least.
@@fl260 i will buy the game and help you get rich
@@fl260 you can get fat and buy drugs
I am an engineer... And wave physics was always a part of study... We have to apply it in real life... Did You know that even the springs of the coaches of Indian Railways have a frequency near 128Hz so that everybody can sleep pleacefully despite all that noises in a train
"Scientist dangles his balls in the air with close up"
Haha porn science
Dangles his "little balls"
😅😂
Clickbait level 8/10 unlocked!
“Old man plays with his balls”
This guy: "Even though I can't hear it I'm still going to use ear protection."
Our generation: "Even though I'm bleeding from my ears I'm gonna turn up that bass."
ok boomer
Ok boomer
Ok boomer
ok Boomer
Huu
I've seen multiple videos about Acoustic Levitation, though this is the first one I've seen made with a reflector instead of a second speaker. I've also seen multiple videos about Schlieren optical photography, most notably looking at the shockwaves produced by a bullet breaking the sound barrier.
This is, however, the first video I've seen that combines the two, and I quite like it. Well done.
It's always a good day when I learned something new. Thank you.
The fumbling at 1:45-1:58, trying to complete the set. Anyone else find that satisfyingly wholesome?
My alien says this is so 6 thousand years old
Are you using the alien toilet messenger on area 51 ?
Aliens are not property and do not belong to any human and I don’t care if Alf or Mork does live with you.
Gut Eater the flush? Yeah
You have a pet Alien? From which planet?
Millions
3:03 it looks like a portal to another world where thunder and lightning is going on !
Doom Eternal
Dead Space
Its hell
You have 69 likes not gonna destroy that.
@@AlexOjideagu2 It does look like the color hues used in the game
awesome to see someone doing this with schlieren imaging, I haven't seen anyone else on youtube doing that before, and it's really cool to be able to actually 'see' what's happening!
I don't get it. The title says "Ultrasonic Levitation" and the video demonstrates ultrasonic levitation, but still 264 people disliked the video. What were they expecting?!
UFO´s
Clear exemple of: you shouldn't really always give a fuck of what people think
Great point. I noticed this phenomenon as well.
he dint give little balls a chance to stay up
you gotta look at it from little balls perspective. he could of made it
its not limited to little styrofoam balls lol. this is just a glimpse at whats possible. look into the ancient traditions of sound moving rocks and boulders. ancient cataclysm and pre deluvian civilisations
Excellent. Very clearly demonstrated. I noticed that the glass reflector is quite thick.
maybe I'm being obvious, but thin glass would break there =)
* T H I C C *
Saken Kenzhegulov nope😂 it wouldn't..if he doesn't exactly hit that resonance frequency it will just vibrate with the other frequency but with a way lower amplitude..and that's the problem. thinner glass is easier to get to vibrate so it takes more energy up.
I guess thicker glass just reflects it better.
Great ! black hole science Lab.
@@_I_am_a_liar What do you mean? Could this cause black holes?
Concept of wave-particle duality demonstrated very clearly.
How does this represents wave-particle duality? This is just simple example of transverse wave experiencing resonance (constructive interference). Wave particle duality was at first just plain and simple hypothesis given by de Broglie's own thought experiments.
He's putting particles on standing waves, the waves are not coming from the particles.
Wait what? I am afraid you have no idea what you are talking about.
This is a concept of ultrasonic levatation, the "waves" you are seeing is the waveform generated from the ultrasonic sound creating gaps of high and low pressure that can suspend ultra light objects.
Literally the transducer or speaker at the bottom generated high frequency sound that creates pockets of high pressure capable of suspending light small objects.
Wave-particle duality has to do with quantum particles. The best demonstration would be the double slit experiment. Again the difference is one thing deals with small macro objects being suspended by macro sound waves that have nothing to do with the objects. The other(wave particle duality) has to do with quantum particles(that for all intents and purposes you can't see) and those quantum particles in some cases act completely like particles and in other act as a distribution of possibilities represented as a possibility wave distribution. Quantum objects and ultrasonic levatation have nothing to do with each other
Am I the only one who is more interested by this weird magical mirror than those levitating balls?
I was waiting to see something else in the background of it. Im gonna find one of those. Lol
@@lucienberl ua-cam.com/video/K7pQsR8WFSo/v-deo.html
@@overloader7900
"Schlieren Imaging in Color!"
Thank you! Very interesting video.
I wish it was a bit easier to setup...
lol.. you will be pleased to know the human eye is capable of seeing what that "mirrior" is showing ;) when you see the "heat waves" coming off the road in the distance while driving on a hot day. thats it. just focus differently on things like your finger tips and you will see those same heat looks coming off your hands like came off his in the video
Congratulations no, there are other, stupid people!
The comments are fresh for a 2 year old video.
*THIS JUST MEANS UA-camS ALGORITHM STRIKES AGAIN*
It started appearing in my home feeds for every refresh and I was ignoring it after watching its upload date.
peenguinne pengguinne *UP VOTE!!!*
True
Yes it is
Like the video.. let the algorithm understand our preference
experiments with the Schlieren method are very revealing !!! awesome !!!
I didn't hear anything but my dog is deaf now.
Does the mic get up to 28khz?
I didn’t hear anything either... which means i’m now deaf too
😂😂😂
The audio codec used by youtube has a low-pass filter at around 17 kHz. The dynamic range is also very limited, so nothing harmful could get through.
Videos that scare headphone users tend to have an extremely low overall audio level. The user then turns up the volume (which also increases the noise, which should be a warning) and then someone bumps the microphone. Imagine the opening scene from "Back to the Future": ua-cam.com/video/3isQI0nXQRE/v-deo.htmlm20s
No worries, I still liked the joke with the dog. I actually imagined the dogs in his neighborhood starting to howl and everybody is confused why they are doing this. ;)
@@zvpunry1971 *confused barking*
Don't let him fool ya with all the science jargon, this guy is an actual wizard!
He he he yeah baby
I agree with Mr. Solve Everything. To make it funny you should have said: “a wizard level 27”
I bet you don’t vaccinate your children
@@sumguy01 He's probably just making a joke. A bit of a poor delivery is all.
Please don’t make these jokes, most scientist take high respect for science (that’s why their scientists). And to call them magicians is like saying everything they are doing is just a small little party magic trick.
Wow! I LOVE the Schlieren optics idea for visualizing the effect!!
A superb demonstration. Thanks for sharing it!
Already knows the concept but seeing in practical was just awesome .
Feel like my question that I asked my physics professor he should have shown me this instead of just saying yes that can happen.
UA-cam why don't you always these awesome videos to me
What?
This is nice just a polite older gentleman explaining some stuff I wish him good health
BTW I am going to be immortal
Edit: in future 2100
I will be 94 then. Still healthy
Great demo, proves the potential of levitation by these means, now all we need is a few hundred years to perfect the technique that our very ancient predecessors used thousands of years ago !! We have a LOT to learn !!
What the hell did you smoke?
Sergeant Sharkseant Really good smoke, opened my eyes and my mind to many things I was not yet aware of, ya otta try it sometime‼️
That's freaking badass! What a great idea to use a schlieren projector. I've known about this phenomenon for years but it never occurred to me to visualize it like this. Absolutely f****** awesome! So happy. 😁
Awesome explanation and demonstration.
While using my power saw sometimes it would hit a certain frequency that made me feel like I was levitating. I always thought what you are doing was possible through my experience while sawing that wood!
Absolutely astounding ! Now we're getting somewhere :)
Thank you. Very nice clear job. More experiments please
its really great to see an information that ı learned in my physics class used in a real life application thanks for uploading
1:11 Does this mean someone can purposefully damage my ears without me even noticing it until it's too late?
Yes
Yep. There is some well deserved controversy over this recently. There are some parks in Philly that are playing loud high pitched noises in the park all night. It's supposed to be inaudible to everyone except kids and young adults, so it's basically used to keep kids away from the park at night. But that just means an adult could walk by and have their ears fucked up without having a clue. It's literally sonic warfare against its own citizens to keep kids out of parks at night... the device is called the mosquito and they need to be removed and/or destroyed. And whoever's idea that shit was should be removed from their position and sued
Scary shit, lets make it happen.
@@Jesse-cw5pv Most animals can hear that high as well, I could imagine they wouldn't be too fond of mosquitos either.
Thats it - getting rid of all the ultrasonic mouse repellers i have plugged in around the house
Our choir in school once managed to hit the resonant frequence of a window perfectly so it started vibrating. Our teacher then explained us what happened. I wish he would have shown us your video, it would have been perfect to visualize the effect!
One of the coolest demonstrations..loved it!!!
We have to perform such demonstrations in schools for young students especially in counties like India(my country) where a lot of rote learning is going on... Many would become 'truely' curious and develop scientific temper.
this kind of work done by this sir, one day will make all civilization moves forward
I need to get my hands on such a large concave mirror... But they're impossible to find anywhere!
I've been looking for ages as well. I even tried a cheap one from amazon but the tolerance was terrible.
look for a used reflector telescope and use that mirror
Experimentboy just buy girls make up mirror worked for me
Newtonian telescope
Experimentboy make your own simple
when my wife screams (sound), the cat lifts off the ground (levitation) ... simple science 101
Scream moaning to coma almost i think be better
THAT IS TRULY AMAZING.I THINK THE WORD CYMATICS COMES TO MIND.
ONE COULD SAY THIS IS THE STRUCTURE OF THE UNIVERSE,INTERFERRANCE PATTERNS OF DIFFERENT SOUND-VIBRATION,S...OMM.
thanks for an informative 'no bullshit' video!
We learn those things at high school, jeez. Nice presentation
Wow what happened to the education system this was taught in middle school
@@mannyman1012 Really? That early?
Thanks for the explanation. And the your response. Time is soooo precious to us all. .
wouldn´t the bright lines be the low pressure area? Your explanation did make sense, but my thinking is this:
the ball would be "sucked" into lower pressure areas and the high pressure above and below the ball would prevent it from going anywhere.
since I assume, that i am in the wrong here :D , i would love, if you could take the time to further explain where my thinking is flawed!
regards from germany!
Yeah it made more sense to me too that the ball would settle in one of the low pressure areas. An explanation (from anyone who knows how this works) would be great.
I might be wrong but when he says high and low pressure it means high and low pressure variation. So at a spot of high pressure, pressure oscillate a lot between a pressure above atmospheric pressure and below atmospheric pressure. Whereas on a spot of low pressure, pressure hardly change over time.
@@arseneferriere5151 That basically correct, but the balls will gather at the points where there is no change over time (wave nodes).
A comment to follow the thread
There are 2 different descriptions for sound. One is a pressure wave, that is literally the variation of the physical quantity pressure. And the other is a displacement wave, that is the actual movement of the air. These two waves are out of phase with each other. The nodes of one wave (the zero points) coincide with the anti nodes (points of maximum amplitude) of the other wave. So the regions of highest pressure variation are actually regions of least air movement. It is at these displacement nodes that the beads settle down.
I saw the same thing using microwaves back in the mid-1980s. Objects could be held static with specific frequencies of microwaves. It was an 8 mm film that was quite interesting to watch.
Un principe d l'élévation magnetique expliqué...et démontrer. Merci.que la sagesse vous guide.
Incredible demonstration. I would like to see other configurations like three ultrasonic horns/reflectors configured with a computer controlling the amplitude and frequency, or three horns/reflectors to manipulate a lens or a drop of glue suspended in the standing waves.
This is what Alfred does while Batman go outside mining the Kryptonite...
This is an excellent demonstration! Thank you!
Awesome! During the first half of the video, I had this idea that the balls would rest in the low density regions, sitting atop the high density planes of air, so I'm glad for the schlieren setup. It took a fair bit of thought to (maybe) understand what is going on.
It's not that easy, though. The reason why the balls fluctuate is because there's a non-linear term on the sound pressure equation that doesn't cancel out (generating a net force upwards). It's not straightforward!
If you think, since the waves generate pressure both positive and negative in the anti-nodes, the average resulting force should be zero, as the sound is oscillating much more rapidly than the ball can respond. It's fascinating, I myself don't understand that well but if you're interested you can look it up.
My balls always rest at low frequency 😂
Thanks for explaining it properly. The explanation given in the video didn't make sense to me, but your explanation is much better.
glenm99 ball be resting on your bitches face
I am too young to get this.. Aren’t the balls suppoused to sit in the low-pressure point, since everything is naturally going from the high-pressured points to the low pressured points? Just like in a balloon, air moves out, because there is more pressure within the balloon.
So hypothetically if you could construct the speaker device to be very large or even more than one device in a vehicle and faced it downwards using the Earth as the reflector could you theoretically have created a levitating vehicle, a levitating aircraft that could travel within those high pressure bands at will, continually using the Earth as the sound reflector?
That would be cool. Although I wonder what would happen in a power outage. :p
I think this would work with two rotating electromagnetic coils and depending on the ultrasonic frequency strength you can both cancel out gravity and dial in the desired height locally! Just make sure the ultrasonic frequency is active inside the coil to interact with the coil's electromagnetic spin!
That will not work. The sound waves need to be bounced back upon themselves at the right distance, for them to give this effect. Creating a moving vehicle out of this principle would be much more complicated and would require an impractical amount of energy.
@@chrisgriffin4012 Yeah not viable at all....
Warmonger of Warsong how will that make it fly? I could see how the compartment above the mirror would levitate but wouldnt the whole thing just drop to the ground due to there not being any standing ways between the speaker and the ground? And also what kind of crazy power would you need to generate waves powerful enough to lift that wave when a normal speaker can lift about 5 water droplets?
Loved the video! Great job!
First off, thank you. This is one of the best acoustic levitation demonstrations on the web. As is the schlieren optics portion in this and in Daniel's video. The amplitude of the pressure waves shown with the schlieren setup was impressive. This was not covered on in the presentations section on Harvard's site so I was hoping you could give a brief description of the amplifier used and the matching transformer in the back ground that appears to be a self wound ferrite core.
The amplifier is a Samson Servo 120 audio power amp. A home-made impedance matching transformer couples the 8-ohm output to the ultrasonic transducer.
The core of the transformer consists of two C-shaped pieces of ferrite which, when put together make a square. Ferrite is better than iron at high frequencies. The primary is 10 turns of #18 wire and the secondary is 100 turns of #22 wire. The inductance of the primary is 230 microH w/ secondary open and 16 microH w/ secondary shorted. It's operational inductance is such that its impedance is well matched to the 8-ohm output of the amp. The inductance of the secondary is 18.8 mH w/ pri open and 1.8 mH w/ pri shorted. It's operational inductance is around 10 mH. The static capacitance of the transducer is 3550 pF. To resonate at 28 kHz, we want an inductance of 9.1 mH. The inductance of the secondary is a close match for that.
The "speaker" is an ultra-sonic power transducer (designed for ultra-sonic cleaning baths) such as one of these: www.americanpiezo.com/standard-products/ultrasonic-power-transducers.html The one I'm using is the 50-watt version (but I'm only operating it at around 8 watts).
Hope that helps. Thank you for your kind words about the video.
Thank you for the quick reply and detailed information. I was heading down the path of implementing some type of impedance matching and your example helps a lot. I wanted it mainly to get the most power at resonance but also to prevent resonance at a frequency other than what the transducer is expecting which is an issue with this amplifier (Pyle PT210) using the 70V output. My setup (for a demonstration in my daughters 6th grade science class) was inspired by yours except I am using an iPhone on an XY translation stage. Thanks again and happy sciencing! :)
www.thingiverse.com/make:382484
Your set-up looks very nice! Good luck with your transformer.
Thank you for your help! www.instructables.com/id/Phone-Camera-Schlieren-Optical-Setup/
you are very welcome
Nice video and wonderful demonstration.
thank you
Loved it ,
A really nice physical visualization of standing waves
The sound resonans, great just like in a laser cavity.
Nice. I never heard about something similar. If you put another Ultrasonic-Loudspeaker to the side, is it possible to move the balls along the highpressurezone?
Longitudinal waves? Tesla?
@@michaelschild8289 i dont think tesla worked with ultrasound.
Yes, that could be done
@@scherenschnitt6333 Tesla was working with longitudinal waves, aka sound waves and actually was famous for it. Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Even more he is known for its experiments of propulsion based on longitudinal (sound waves). Therefore this seems nothing new but recycled Tesla work.
@@michaelschild8289 ah okay. This was new for me. I only knew about his work with electricity and these teslacoils to use the ether for communication.
Soon as he put the second ball in I felt the frequency change in my ears !
I wish my science class look exactly like this
Why this kind of videos are underrated 😕 😐🤔🤔
really loved the part where you overlayed the schlieren optics with the regular footage, very artistic and pleasing to look at.
thank you
If we learn the Physics in that practical way i am sure there will be more productivity.
2:31 Damn its look like CGI magic - what's that spell? Air Aura?
Schlieren Photography m8
Aurora
Already knew this, but theoritically only. Glad to now see it practically!
So could you levitate a vehicle or move a object if you changed the frequency or volume?
whatfreedom7 when science working it work in all dimensions. Mean bigger and smaller it’s booth possible.
That mirror is like opening a portal to other dimension
Yo I thought the same thing
U r such a good demonstrater
You are tragically under-subscribed
because he is at Harvard.
I would like to see acoustic levitation of objects done via electric wave instead of sound wave which i think is doable in theory. I think it can be done with top loads of two Tesla Coils pointed at each other while operating 180 degree out of phase to each other and creating nodes and anti-nodes in space between the two top loads. You will likely need to rectify AC or DC to Tesla's LC (Longitudinal Current) first so you can have electric wave behaving like a sound wave. For circuit diagram to produce LC/LMD wave, google "The L.M.D./T.E.M.Test - JLN Labs" and for demonstration of Tesla's longitudinal electric waves, google "Transverse & Longitudinal Electric Waves and Tesla’s Longitudinal Electricity" by electrical engineer Eric Dollard. Longitudinal electricity has electric field and magnetic field flowing in same direction as you can see in this video "Replication of Eric Dollard's Analog Computer". You can easily measure it with Trifield meter.
What a neat demo, thank you.
i'd be curious to see if it's possible to levitate glitter powder and if it is, what kind of patterns take shape
Yeah ...I'd like to see that too ! 3D patterns "WOW"
If just the wave frequency can adapt itself with length in between the object.
Idea
I imagine it would just be a matter of changing the pitch the speaker is putting out.
Its just matter of times, someone will found a way to do this, then we have anti gravity irl
Perfect demonstration of standing waves .👍👍you did a great job👍👍
Perfect illustrate how zushi zushi no mi (issou - one piece) works
But doesn't that fruit actually allow the user manipulate gravity?
1:50
I wish he put glitter in there or some sort of mist
So we can see the whole structure of the waves
That's what the mirror was for!
@@tbucknor he probably meant to visualize it in 3d. like what shape the center would look like.
I hope I live long enough to see this technology enter mainstream usage. It could have any number of applications, cooking, manufacturing, VR, who knows.
It's 2019! They promised us levitating cars in the year 2000, not little balls.
sadly they have it but dont give us.
you can get it at FORD auto center
They lie, get used to the disappointment. They neglect the children too.
“They” didn’t promise you sxxx 😂
Flying cars already exist. But why would we issue them if we can even use a blinker and end up causing 30 car pile ups? No one wants a flying car barreling into their house. Once autopilot has been fully flushed out then I assume the next steps are how to get them for practical use on flying cars and building virtual roadways to plot courses. So human don’t have to cause so many unnecessary negligence deaths
So UA-cam decided to levitate this video into recommendations.
And they have been doing good on healthy ads so wierd i like it if they keep it up I just might go chicom
This is one of the best thing i have ever seen. Superb ❤️❤️❤️
A quick note to everyone that found their way here at 4 a.m.:
Just because you can't hear or see it doesn't mean that it's not there
Life is _Scary_
Life is not scary
Life is not understood 😉
@@Legalisenuclearbombs Life is scary. I don't know what fairytale you live in.
1:37 The old man is playing with his medicine again!
Belle démonstration! Merci
Depending on the electric consumption, this could be a very interesting vanity or practical piece of technology.
Yup. We realize that vehicle noise pollution is associated with more dust particles in the air.
I am convinced that Gravity is just frequency. - Ronin_douglas
It's not tho
All forces are frequency
Im convinced that all is wave/particle interactions in a soup of higher energy but you kno... im just some guy
@@leomadero562 Ok. Cool. Me too, perhaps. Lol.
what an amazing, beautiful experiment.
we are now 99% closer to figuring out what the Egyptians built the pyramids
Sure is. They used tech very similar to this levitation. That's why they had cubits measurements in the blocks, they had to be a certain size.
Wait till people also find out that it only took a couple of hours to build them, AAAAAND they were built from the top down :).
Now off you all go down a rabbit ole :D
Nicely explained, thanks. PS I think I saw my dead relative in that mirror.
That was pretty fly, thanks Grampa, love ya.
Holy shit! I understood everything EVERYTHING
Bad ass, great video.
Wait, what else is there to make the mirror reflect the waves? Does it need a special light frequency?
The mirror is part of a schlieren setup, which bounces light back on its original path and can show density changes in the air. At 2:48 you can see that the warm air rising off his hands is visible as if it were fumes, but its just the change of refractive index due to the density change. The optics are there just to show the standing waves, the acoustic effects don't need the optics.
@@r0cketplumber yeah, but my question was if the mirror needed a light frequency to be able to reflect back the waves...already found the answer and the answer is yes, more than a specific light frequency, it needs a one pointed source of light and a sharp obstruction before it hits the mirror, without it the mirror does not reflect the waves.
This is a really great presentation showing the sound wave
If a small device was emitting a sound such as this, and was in the atmosphere (in the clouds), would the water in the clouds cause some kind reverb? Similar to the glass, but less powerful?
And would that reverb be enough to make the device levitate? Someone smart point out the flaws in this idea cus I don’t research I just think 💀💀💀
Not completely sure but here’s what I think.
I dont think a cloud would provide much reverb for 2 reasons
1. It is simply to far away and it would take forever for it to come back and by the time it did it wouldn’t be enough pushback for it to float a small object as most of the sound waves would probably have spread out.
2. A cloud is not solid and does not provide the reverb for the object to float, Pretty certain for this to actually work you need a solid object to bounce the sound wave off of.
Thanks for coming to my TEDTalk
@@ivanmendoza5393 I enjoyed your tedtalk ty
@@xxochitla7166 the thing is, sound is reflected by a phase difference of 180 degrees, when incident on a denser medium from a rarer medium. ( here see, the glass is more dense than air, so it's able to reflect by a phase difference of 180, which is responsible for the effective superposition of the sound waves, resulting in the effective production of stationary waves.) , since water is more denser than air, so yes, we can have the same effect with clouds too theoretically ( U might ask then why are they able to float, that is explained by the buoyant force experienced by the cloud surface due to air. Now the reason being it's too hard to experiment with is that :
Here we kept the glass surface fixed at that particular position ( which should be a multiple of half the wavelength to achieve the case of standing waves.)
On the surface of clouds, the air particles striking with the clouds will create pressure on it, and that pressure will result in upward force on clouds which will increase the distance between the cloud and the surface of earth.
And one more reason for this to be hard to achieve is that, the velocity if sound depends on the temperature of medium in which it propagates, and temperature of earth atmosphere decreases as we go up. So the speed of sound will also become variable, which will make the wavelength a variable.
Theoretically it's possible because there we take many assumptions as to this cannot happen, the clouds are fixed, and that the velocity will not change, but practically it's very very difficult.
I need that in a small house so that I can levitate and navigate around
being able to see a waveform was amazing by itself . Three times wow!
I need to go back to studying what I really like, telecommunications
A Bumblebee with tiny wings must use the vibrations to add lift.
Interresting
This magic would have him burned at the stakes some hundred years ago. Thank you science :)
Britguy1962 jews?
he was obviously referring to the Amish
Amish are non violent and don't have a death penalty. Where do you get your information? The only one chopping off hands and rejecting science are the same ones who follow the Koran. Most religions are very peaceful, contrary to what Cultural Marxism has taught most (dumb) Occidental youth.
@@myopicseer I am surprised you could be so aware and yet so naive> Koran followers do not reject science. Science and spirituality are the same in Hebrew - and not all Hebrew speaking people follow Koran, Quran or Torah, but in essence, ALL religions know same, protect same, occult sAme. But you can find it if you want to. Hebrew is based on mathematics and scared geometry. Really surprised you chose to single out Koran. Look into "tree of life."
Nice! Great explanation 👍😀
2:21 me trying too find my glasses even tho I already have them on