I Had To Break My Radiometer For Science
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- Опубліковано 28 вер 2024
- Did I actually discover a source for supercontinuum generation? Join me as I try to figure out why my IR laser makes a crookes radiometer light up
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I highly respect you doing these experiments and reporting them. Keep up the good work.
much useful than verisatium.
@@vishals7433 Veritasium videos are based on diverse topics and they also have more funding.
@@vishals7433 They make pretty different kinds of videos, sisisndofnfff
Did
F
@@vishals7433 More useful? Almost all his videos are just random "experiments" with facts unrelated to anything stretched out into 8 minutes to generate the most ad revenue.
I can't resist making a comment about your vacuum chamber. I always enjoy when it shows up in your videos, and it definitely was the tool that propelled your channel in the first years!
This. I was writing my own comment about the same thing then noticed xD
Similar to "The Hydraulic Press Channel," alternative names for your channel include:
The Vacuum Chamber Channel
The Vacuum Action Lab
The Vacuum Chamber Lab
Action Lab's _Will It Vacuum?_
I can't resist making a comment about Les' Lab latest video literally shows how he made a "DIY Supercontinuum Laser! The Ultimate White Light Laser!" Neat timing for some neat systems.
It was actually the hydraulic press. The channel used to be called hydraulic press action but he started doing too many other things and got more popular so he changed his name
That's what made me subscribe to this channel. I was like this guy is serious
the spectrum looks like black body radiation, perhaps the infrared is turning into thermal phonons on the graphite surface
It is graphite pigment or some kind of nanocrystal pigment ?
@@gorog15 It's most likely carbon black and graphite is a form of carbon
I was also wondering, as a physics n00b, while watching that section why it couldn’t be black body radiation. That would explain the full spectrum. And Occam’s razor says that the simplest explanation is likely to be the right one… But this is an interesting way of talking about the other phenomenon nonetheless.
And only works in vacuum since the heat gets transported away by convection too quickly without it
=EXACTLY IT WAS BLACK BODY RADIATION,AND IT DOESNT GIVE A HELL ABOUT WAVELENGTH
...................................
There is one thing I now know: I need a vacuum chamber.
He sells a mini version on his website.
When you said that you weren’t sure what was going on, and that’s why you’re posting a video to get our thoughts, I was thinking of posting “Black Body Radiator?” Turned out to be the case as you kept pushing to figure it out. I love your videos! Thanks for all the hard (but fun) work!
I really admire the fact that you left all the parts where you weren't sure about the explanation, even though at the end you could have just edited it all up with the results and upload a video where you "know everything" - this really shows your scientific spirit!!!
I really love the way this one was presented. Felt like you discovered something then through experimentation, figured out what the cause was. Like watching science happen, rather than being told how science happens. Nice job :)
Send this guy a new radiometer!
the part where the light was confirmed to be white by using the diffraction grating was kind of genius
You can't win a debate against a physicist, especially if he is actually right; physicists always find a way to prove their statement.
@teasureofeverything5707
subscribe it please😁
Yes. Truly.
What would be sweet would be using a cost effective spectrometer like a good channel that can use more funding and support, Les' Lab. He's even provided open source software for some of his videos projects that are mostly cost effective and smart stuff too. His latest video literal was "DIY Supercontinuum Laser! The Ultimate White Light Laser!" and is worth checking out since a lot of more serious DIY projects that might cost a little more, though neat if you get into.
Hey Action Lab, thx for all the good content. Always curious many times surprising! Have a nice holiday and keep up the good work! You are an inspiration for many!
Would love to see how much heat is left in the black part of the radiometer with an IR meter
Or a non contact thermometer
Isn't that what a ir meter is? A very low pixel ir camera ?
@@ralanham76Yup.
Maybe it'd work in the vacuum chamber, but the radiometer is made of glass, so presume it would block any measurement.
@@Unsensitive I guess glass blocks some ir.
I always wondered why the laser card would get saturated (or I guess unsaturated).
As an optician, it was incredible for me to see white light from an IR laser. Thank you so much for the explanation - this is a very interesting effect that can be used somewhere.
I was thinking about anomalous luminescence but it turned out to be good ol' burning stuff to produce light.
It wasn't burning anything. It just turned it hot, which caused black-body radiation.
Did you notice the small point of green light reflected by the radiometer glass @ 3:51? I would be curious to understand the mechanism of this phenomenon.
Good catch.
I'd first written a guess that the glass of the bulb might be recoloring that reflection, but on repeated viewing, I think we're looking at lens flare refraction inside the glass of the camera lens. The point of light is certainly bright enough to have this effect in the dark room. There are at least two spots visible near the opposite side of the screen from the original bright spot, and there may be corresponding spots near and on the same side as the source, but they're too washed out for me to see. Coating that's commonly on camera lenses naturally shifts the refracted color through multiple frequencies.
nice lol
A lot of times, if you take the base off of those radiometers, they have a valve stem like an incandescent light bulb. I was hoping you would have done that to release the vacuum instead of cracking the whole thing. That way you could have used your vacuum chamber and revived it afterwards.
Hi Action Lab,
Nice video and demonstration of that effect.
I'm an engineer specialized into organic and bio chemistry and I know a lot about chemistry and science, but less about specific aspects of physics. I had an idea about your experiment but I had to first check onto wikipedia what they say about Black body and Stokes-Raman.
I found that wikipedia under Black body states litteraly into the chapter "Near-black materials" that:
"They also have application as solar energy collectors, and infrared thermal detectors. As a perfect emitter of radiation, a hot material with black body behavior would create an efficient infrared heater, particularly in space or in a vacuum where convective heating is unavailable."
So this is precisely what you displayed :o)
Your IR laser hits the target (black or white; with black being a better absorbant and less direct reflection emitter than white); because it is under vaccuum (partial or near total), it will limit convective heating (and/or cooling) by surrounding gas molecules; so the heating happens into the spot shined by the laser beam; then it increases with the time of exposure (observed by the glow seen into your video between 3:49 and 4:12; that passes from orange to yellow to bight yellow-white); the ray then heats up the coating (sometimes with smoke) and the metal underneath; the molecular agitation into the solids then dissipates it thermaly into the metal radialy and concentricaly to the beam spot; then only radiative emission of the black body can be observed (as if your spot was a white source of light (like the Sun, like old bulbs of carbon or tungsten (W) filament heated by their resistivity under the passage of current through it) and it display the all wavelenght (color) spectrum of those (of course the light re-emitted is < or equal to the light from your laser (otherwise you would have created more energy than furnished).
So by activating the spot, the light takes some time to get ful emission intensity (ta); and conversely it should do the same, when the light is closed; the spot should glow darker by passing subsequently to lower wavelengts (yellow, orange, red, infrared (heat)) and this takes a little, but stil finite time (te).
This in principle should be observable with a spectroscope with a dynamic of extinction caracterized by a more and more prononced red shift and IR (from blue to red - to the right); the enlighting fase would go counterwise of course with an increasing blue shift (from red to blue - to the left); lets say a "full color spectrum sunset".
---------------------------------
Now regarding your cristal doubling frequence; it doesn't contradict the principle of emitted frequency is usually < or equal to incident frequency because two photons of IR produce (more or less - :o)) but one photon of green light is less photons.
A bit what happens with a tide of water made of molecules with an average energy level; but when hitting a surface perpendicular to it; some droplets of it can go much higher than the tide height.
Probably that in a near future some other cristals with such rare effects will be discovered or rendered public... (see for example below anti-Stokes shift).
There are other cases where the frequency rule doesn't seems to hold:
1) When looking at Raman spectrum; it looks as if shining a laser frequency onto something makes 3 types of rays;
a) direct reflection or scatering at the same wavelengt as initial
b)Stokes shift (red shift) that kind of gives a finger print of the molecules (kind of fluorescence type) thus lower frequency is emitted than the incident excitation frequency.
c)anti-Strokes shift (blue shift) that also provides info onto the enlighted molecules.
As a matter of facts a) >>> b) >> c) (c is a very very rare event statistically)
So "b" needs very strong filters to cut off "a" (and "c" will need even more efficient filters because its intensity is very low)
Int(a) >>> Int(b) >> Int(c)
Wikipedia states under Stockes shift:
"Anti-Stokes shift
If the emitted photon has more energy than the absorbed photon, the energy difference is called an anti-Stokes shift; this extra energy comes from dissipation of thermal phonons in a crystal lattice, cooling the crystal in the process.
Yttrium oxysulfide doped with gadolinium oxysulfide is a common industrial anti-Stokes pigment, absorbing in the near-infrared and emitting in the visible region of the spectrum. Photon upconversion is another anti-Stokes process.
2) The famous effect of relative to each other speed of emitting source and observer; the Doppler effect... very observable with sound, but also with red or blue shifts of galaxies.
So approching galaxies (source arrive towards observer) or if we come closer (observer approches source) (or if both reduce their distance towards each other) will produce a blue shift that may look like frequency is higher than it should if everything was still and not moving at all.
Regards
PHZ
(PHILOU Zrealone from the Science Madness forum)
I know this will probably get lost in the comments but sometimes when I’m home alone I like to go out in my garden and cover myself with dirt and pretend I’m a carrot.
What
Heh?
Keep going king😥
Edit: just found out from alot of replies that this comment is just a copy from other comment sections in other videos... this really is a bummer as i thought this was an original and that it deserved recognition, i was wrong, so i would like to change my reply to the following: please *don't* keep going because you're no king and you will never be one by copying others and leaching off of others success.
Thanks for reading...
We will make sure this is not lost.
I do that too but naked.
I love how you point out that these effects are so weird. That's precisely my reaction. It keeps me curious when I notice stuff like that.
How about using thermocamera to check the temperature of the spot illuminated with the IR laser?
I love this video. Having someone say I don't know, let's learn more is so rare. Showing us the reasoning and coming to a final conclusion through experiment was just amazing.
Nice video! I think supercontinuum generation would have been very unlikely. It is a process which requires the material to be mostly transparent at all wavelengths (both the input laser wavelength and at the generated wavelengths). Also, it requires an extremely high power ( ~ kW), usually obtained at the center of ultra-short and very focused laser pulses. This is because the type of light-matter interaction with the material that is involved (3rd order non-linearity) is extremely weak in most materials. Also, depending on the strentgh of this non-linearity, the optical pulses should travel in the material for a given length for the spuercontinuum process to be effective, for example few cm or meters in optical fibers, or few mm in photonic chips with more efficient materials. Though it was a nice idea and congrats for managing to rule it out experimentally !
Yep, I was thinking the same. Though "Supercontinuum in Multimode Fiber" is Les' Lab latest YT video and worth of watch. Great detail and amazing output!
@@jafinch78 I checked thx, nice video!
You should make a radiometer with Musou Black and White 2.0, or if you want to go further... perhaps Singularity on the black side and Spectralon on the white side.
Totally was a thought I had. Great thinking!
i always wondered about different types of molecular crystalline structures, and how we artificially create some with specific arrangements? it's kinda like making graphene but with crystals in bigger chunks? i would love an entire episode on this and how it can be used to manipulate light wavelength and possibly discover new properties of quantum physics?? i was thinking it could be combined with light and heat energy to convert it with an artificial process of abiogenesis with controlled parameters! but i don't know what's possible and what not with current technologies and what we can find naturally on earth and in space? and possibly how to discover new arrangements, the theoretical part of vector physics. fascinating stuff!
I still cannot classify the way you approach problems. But your intuition, curiosity and persistence yield a stream of continuing discoveries. I am glad you traced out the incandescence. Perhaps you did find a practical way to use long wavelength IR to make white light. As long as it is reproducible why quibble? "All I've got is this IR laser, but I need white light. Stick it in the vacuum focus it, and be sure to cool it so the lattice or plasmonic states do the right dance and sing the right frequencies." You helped me understand "high harmonic generation" and "frequency doubling" better. And I have never seen those "infrared to red dot laser paper"things before. Or the "glow in the dark, draw with a laser thing" before. I wish I had time to translate your videos into "What are reliable ways to model this, calculate what is happening, and apply it to broader classes of materials and to make new devices or predictive phenomena" web pages that anyone can use to explore what you found, and "make predictions and make new things to share with everyone in the world."
If you get a chance, please look at 3 axis MEMS gravimeters that are able to track earth tides. They are sensitive enough to track the sun and moon vector tidal gravity in real time. All three axes almost exactly match the Newtonian vector tidal acceleration with only a linear regression for each axis. Maybe you could try to use an atomic force microscope to monitor tiny movements of masses, when you differentiate the position, it is velocity. Differentiate again and get acceleration. A "gravimeter" is simply an accelerometer sensitive enough to track the sun and moon. Arrays of cheap devices, around the world should be able eventually to monitor gravitationally hot spots inside the earth. Places with more than the usual share of local acceleration changes. Like earthquakes, surf waves, volcanic flows, ocean flows, atmospheric flows and turbulence.
Richard Collins, The Internet Foundation
Thank you!
Great demonstration. Les' Lab latest video literally shows how he made a "DIY Supercontinuum Laser! The Ultimate White Light Laser!" Neat timing for some neat systems. You can maybe give him some props and subscribers by referencing his video and maybe doing the same or even more homebrew?
That was my initial guess, that it got really hot.
At first i didn't know there was a vacuum inside that bulb. So i thought there was some super absorbent paint on those fins that would easily glow. But once you said there is a vacuum inside it i realized that it glowed white hot because it had no way to transfer the heat away from it. Air is pretty conductive for heat after all.
Very interesting! I wonder, is it just because the vanes are black that it works well or is there a coating on the black side of the vanes that also interacts with the IR?
probably just b/c it's black (therefore absorbs most wavelengths of light, apparently including IR)
Combination of the vanes being black and very thin.
They are good at absorbing IR and there is not much matter to transfer heat to.
The reason it works in the vacuum is because of the barrier between. In this case the barrier is glass. Energy is going through the glass to turn the blade. The dot you see is the source wave crossing back on itself, or twisting (perspective). That results in reflected visible light as well as pull/thrust for the dark blade. The shape of the glass is important as well. When you used your chamber, the dot seems to reflect back from the barrier (chamber material) and not the blade itself. The bulb shape combined with the vacuum, converts the light to thrust and allows you to view the light on the next barrier (the dark side of the blade) from all angles as if that's exactly where you point it. But you are pointing it there. To me that ties into why time seems to stop around black holes. It's like the space between is the barrier, the distortion. From another viewpoint, that dot from the Infared laser (low pressure) is the eye of a reverse hurricane that draws in high pressure (and we see the point of the laser). The equal and opposite reaction is the spinning of the blade and reflected light. To me the basic function of reality, and a positive and negative charge with a gate between. The real control comes from the gates. Galaxies wouldn't look the way we view them without the gravity of a blackhole.
Just Imagine one Day he actually discovers something new by just making these science videos that would be crazy!
Sadly that is basically impossible. He just communicates mostly well known and understood science to us. Which is amazing and takes skill, pl e ase don't think I am saying otherwise. I love this content. But he isn't running new experiments or anything like that. So finding something new is basically out of the question.
That happened to Steve Mould (sort of). Well he didn't discover the chain fountain thingy but his video made it wide spread. And 2 people made a paper about it, called it the "Mould effect".
@@zogar8526 you can construct something "new" though.
Its called AC resonant magneto-hydro dynamic propulsion. The DC variant is a fraction of efficiency an AC would bring, but i suspect we are not allowed to use it due to some "mass destruction" laws... Since vacuum is polarizable with such a unit you could push yourself in space too
It did happen to Phillip Mason in his channel, called Thunderf00t. He helped discover some crazy properties about sodium and the coulomb explosion. It is beautiful to see a liquid metal become yellow, blue and transparent.
@@manipulativer huh?
That's amazing. I hope this video goes viral! Thank you for your work and content 👍✌️
Next video you can show how you Fix it, and make more radiometers.
I think perhaps boltzmann curve shall suffice... vacuum means no convective/conductive light transfer, which means the dim laser is effectively able to impart more energy.
So cool! Love seeing science-you know, that actual process of curiosity, discovery, testing, figuring stuff out. Love it!
This man never fails to surprise
That was one of the most simple but impressive phenomenum i had sen on your chanel! Thanks for the explantations
Wow, that was really interesting!
This is a helpful video. Currently I am struggling converting a infrared laser to visible laser, your video provides me inspiration.
You need to check the temperature of the Dot because the spectrum appears to be Black body. Your Laser is heating it up but Radiative cooling is extremely bad.
I was going to suggest a black body radiator as well. Since there is no air/gas it can’t dissipate the heat. Also since there is no oxygen it didn’t burn in the vacuum
I don't think it would be easy to check the temperature of the dot. Those remote thermometers have a much wider cone than their laser-pointers would suggest, so you could just be measuring the average temperature of the entire vane.
I'd like to know what'd happen if you kept the laser steady for a few minutes. Would the dot stay just as bright? Would it get bigger as the vane heats up? Is it ablating the carbon away? Maybe it's only the vaporised carbon that's incandescing, because after it breaks free from the vane it can't lose any heat conductively.
Radiative cooling is very efficient, actually. That explains why rescue blankets are so useful during mountaineering, etc. The human body loses about 50% of heat via radiation losses (at a miserable 37 °C) the rest via conduction & convection.
Hello from the other side!
You may have studied chemistry, but I see you as more of a physicist than I have seen in most of my peers in the past. Experimental physics is just wonderful! In order to be a good experimenter, experience is advantageous and creativity is indispensable for the implementation of the experiment because of...but it is much more important to "pick the right questions", or questions in general - to nature, technology , whatever - to be able to ask. In this video, this fact was highlighted so well! Just great, thank you. I hope you will be able to fill many inquisitive minds with ideas and insights in the future. LG from Vienna
If you spot it with a udible frequency pulsed laser you can hear the frequency too, photons and phonon will be produced by this carbon coated surface
Great demonstration of how knowledge and scientific process can lead to understanding of an unknown phenomenon.
I'm still left with the question how a low power laser can burn the radiometer.
Good question!
Given what he said there are 2 factors.
a) absence of oxygen
b) a focal point distance out of which the phenomenon isn't manifesting
5:53 RIP Radiometer! A pure sacrifice for science!
people were making fun of him for having a vacuum chamber...and then he breaks out his crookes radiometer! 🤣
Wow, I've never seen him get stumped before. This was fun trying to figure it out like that.
You don't seem to be careful with IR laser. They are extremely dangerous and can inflict serious damage to eyes by accidental reflection that you can not see (and so there is no protective reflex).
Some ir lasers are not so dangerous at low powers. 1550nm for example is absorbed by the fluid in your eye and therefore little energy makes it to the sensitive photoreceptor cells at the back of your eye. Also, the lens in the eye does not focus 1550nm light onto the sensitive cells at the back of the eye, resulting in relatively low energy density at the sensitive cells and thus less chance of injury. This is how some LIDAR systems can operate out in public without blinding everyone.
Yea it really depends on the frequency
Dmitry is correct. I think it would be a responsible thing for the actionlabman to invest in a laser safety course. He really is asking for an eye injury - so many safety issues. If he was doing that in a R&D laboratory or even a university lab he would be in serious trouble if not fired. For example, does he know that the 1064nm Nd:YAG laser is not completely converted to green? There can still be a significant, non-eyesafe 1064nm through the nonlinear crystal or OPO. And no, 'just wearing goggles' is not sufficient. Source: I am a laser lab manager.
His background is in Chemical Engineering and I love the channel but worry its not going to end well for him.
@@RealSuperDuperCooper At what point in the video do you see him using the laser without googles?
7:07 reverse lightbulb, baby
You could probably make some creative lighting concepts with that laser-induced incandescence. Would an IR-laser incandescent bulb be more efficient than a regular incandescent 🤔
then try to put a sheet of paper in the vacuum and see if it turns bright with the IR laser......If find it really surprising given you wont feel the laser on your skin
Right, so is there something particular about the properties of the radiometer vane, or will other objects glow white hot in a vacuum when hit with the same IR laser?
This is the most interesting video that I’ve seen yet on this channel - and I’ve seen dozens and enjoyed almost all of them.
And now I’m again missing my radiometer that I got at Disneyland more than four decades ago.
sorry but if it's a matter of incandescence how long can it last before the material carbonizes? You should have tried on the white side as well, what material are the black and white diamonds you used made of? maybe the glow is due to some component of the paint..i don't know why but i can't believe it's a glowing issue due to high temperature, please keep thinking about it and see if you find other possible reasons.
He did try on the white side though. 7:20
I suspect the black is carbon black, so is already carbonized. Carbon was used a filament in early light bulbs, I believe.
@@curtheisler1200
True! I missed it, thanks!
I remember taking a course in nonlinear optics and the professor would keep talking about "supercontinuation" non-stop.
It might not be super continuum generation, but still very cool that a low power IR laser can create such a bright incandescent spot!
At some point in the video I started losing hope about seeing the vacuum, but at the end you didn't disappoint!
The way it instantly glows white and then dies down instantly amazes me
This is my favorite episode!
Thank you SO much!
Wow! This is a pretty cool effect that I've never seen before, crazy what light can do! 👍👍👍👍
After shining on Radiometer blade my first thought was: "ok, it's just hot so it's radiate".
amazing work, you keep improving, your best work is yet to come.
Mad Styropyro vibes, especially lighting the spinny thing with lasers.
"it's not heating it up, this is not a hot laser! but turns out it was just heating up"
That's amazing. My bro science tells me that the laser isn't reflecting so much but instead ionizing the target and creating white light. The absorbed light is converted to heat and an electron giving fuel to the white light. Thanks for sharing it's definitely food for thought.
I am always impressed by what can be accomplished by an educated and enthusiastic mind, and such simple tools.
I think the physics mystery of why a vinyl shower curtain is drawn inward when the shower is on, regardless of water temperature, is an electrostatic effect. I even put my hand under the curtain to see if there was air flow and there wasn't, it has to be pure electric field effect, seems surprisingly strong though, it'll pull a thin curtain way in.
I think you need a candle or something to sense air flow more reliably
@@u1zha Why would air even be flowing under there though? There's another cloth curtain outside that hangs down over the outside of the tub, air couldn't even flow in under the inner curtain.
This was what I consider a gem. I was stumped.
3:15 "as you can see, you cant see"
Graphite is quite opaque to IR light. It does a great job at absorbing all the energy... well, until it combusts :P
love these science experiments
This was such a cool video! *Totally worth the length. Loved every minute of it* 🙌🤩
RIP for the old radiometer.
There are also materials that can do direct upconversion, this is not impossible and does not violate the laws of thermodynamics. The frequency can be increased but the amplitude drops.
So grossly incandescent!
The vacuum chamber is the main character in your videos
You always find something new and unexpected, never repeating what is already told.
Wow, I love it way cool and I love that you use your vacuum❤❤❤
One more use for the vacuum chamber.
Try to put an audio amplifier built with vacuum tubes, with the tube glass broken, inside the vacuum chamber.
It is impressive how the cathodes light up, and the tubes start to conduct, only when vacuum is reached.
With partial vacuum only, there are sparks - especially in the output pentode.
Merry Christmas
Anthony
Once broken open a vacuum tube's cathode will react with the oxygen and water in the air. In most cases the oxide layer expands and flakes off the cathode. You do get a certain amount of re-activation of the cathode under high vacuum conditions but the cathode is nothing like as emissive as it was before exposure to the atmosphere. For this reason, I use bright emitters, tungsten, for all my cathodes.
When you showed that the emission was full spectrum, the first thought that went through my mind was black-body radiation, and that seems to be your conclusion. This was a surprising and fascinating video.
Thermal emission is exactly what I suspected at about 4:13. Also, I believe this type of device would be optimized (gas pressure, composition, paint, etc.) to maximize the thrust to spin the vanes. So the fact that it worked best inside the glass bulb makes sense.
I think what happened was that the near Vacuum allowed the air around the laser point to heat to where it began to emit its own light. Kinda like a lightbulb but powered by IR radiation.
Before I finish watching i asked ChatGPT about why this happened. It said because the surface heats up so it create white light.
Awesome! Another episode of The Vacuum Lab!
I used to use the older CCD cams for computers that were made super cheap. They lacked IR filters cheaping out and could make out IR, even could resolve the beam of a TV remote. Strangely IR on them looks pale blue.
Why pale blue
@@jurginschuhardt4858 A good question that I never got around to figure out. A guess I had two or more IR photons have hit a photoreceptor and come out with combined voltage. On the other hand near IR light can be picked up by many older digital cameras as they use silicone sensors. They may have assigned it a color on the software side for some QC testing purposes.
@@krisreddish3066 thank you for replying
I had a radiometer back in the 70s. It got knocked down sometime in the 80s where it imploded. I kept the black /white things for a long time. Not sure where it went, but probably trash. That material was very flaky or powdery if touched.
My first guess was that the air was so thin, that it would not require much energy to become hot enough to glow. But after it could be visible outside, I'm not sure if it's air glowing, although it is much brighter in vacuum.
I have a green laser pointer. When I shine it on an orange high visibility safety sweater I have the green light changes to orangey-yellow. I have a similar colored orange shirt that isn't high-vis and it doesn't change the color at all.
Fascinating Video! Also there is another phenomenon to convert lower energy photons to higher energies called upconversion, it basically uses two atoms that get into a higher energy state and another atom which the energy of the two excited atoms gets transferred to which then emits lower wavelength light than what was used to irradiate the material.
So instead of one crazy result you got a completely different but even crazier result xD
I love it. That radiometre material has interesting properties
You might be on to something about how the black surface light up in a vacuum using IR laser. As you know BMW and Audi uses blue lasers going through a phosphorus lens to convert the laser into white as the high beams. If you make a light bulb using the same concept as you just experimented with, this could be the next alternative to LED bulbs.
"for science
you monster
there's just one small thing we need to take care of first..." -GLaDOS
there are industrial rust removal infrared lasers that produce a very simmilar effect
I was gonna say it's just heating the metal up... 1064nm lasers are what's used in Fiber Laser engraving and cutting machines. It really doesn't take much power for that wavelength to effect metals.
Vacuum chamber experiments are the best !
Nice video explanation😊👍👍
This is very interesting - thanks for sacrificing your radiometer for science! But why, when the radiometer was intact, did shining the IR laser on it continue to shine brightly without destroying the section of paint the laser was shining on? Why did that only happen in your vacuum chamber, and why was the white dot much less bright in your vacuum chamber? Does it have to do with how the vacuum in the radiometer compares to that in your vacuum chamber? Is it more rarefied or less?
And can you buy another radiometer to replace it, that has the same behavior with an IR laser?
I wonder how energy efficient that was, probably better than expected
I would suspect that it has to do with the nature of the coating - absorbing near to all energy of the laser and having not enough air to dissipate it (by convective cooling) so these (seemingly small particles) of soot or metal nanoparticles start to glow and emit a nice continuum of light. After all that is what the coating is applied for - absorbing light an heating the little air that is left in there…You can actually see the dust like nature of the black coating in your finger prints on the sticky tape at some point. Please test again with simple soot (from a candle) or carbon dust or even NP coated platinum. Or even test it with this blackest material on earth (Vantablack?)? Good luck!
Me: "My wife is giving birth"
The Action Lab : "OK let me bring my vacuum chamber !"
This was more fascinating than I thought lol
Fascinating. Could it be that in a vacuum it is generating heat as an effect off the surface, while non in a vacuum the surface doesn't an effect?