I garbled the classicall em discussion when trying show how the diagonal light partially gets though a 45 degree rotated polarizing filters. Simply put, in classic theory, once one polarization is selected by the first filter, that is the only polarization that can continue though to the end. The following filters all reduce the level of that polarization further based on how more or less misaligned it is with each of the subsequent filters. Sorry about the confusion!
In the 70's I found some polarised film and had the idea of fitting it to car head lamps in the vertical plane and using un-tinted polarised glasses at night. It worked very well and I was surprised that car makers did not install polarised windscreens and headlights. Interesting video thanks. I will have a play after I have found Schrodinger the cat.
What a great idea - particularly back then. It would be so great if they did that. I wonder if besides cost(always a key factor) the issue is the 50% dimming of everything at times like dusk? Very cool you tried it. With polarized film being produced in large quantities for LCD displays, it probably would not be that expensive to do today.
@@ElectromagneticVideos Good point on cost, what I found was a small area of film over the focal point reduced the glare so your vision was not compromised I suppose the more open iris compensated for the reduced light emission. I only had my chums dad's Cortina to have as a test subject. I remember the very first LCD display in Practical Electronics and that is where I got the idea.
@@WOFFY-qc9te Your in the UK, right? The geniuses over here in Canada and US until recently required sealed beam headlights (reflector internal to the bulb), as opposed to bulb and reflector used in the UK and everywhere else. So over here each complete headlight lamp would need a internal filter, or a big one in front of the sealed beam headlight. So the extra headlight cost would have been a one time thing in the UK and reoccurring cost over here. Your approach and maybe wearing "nightglasses" rather than a polarized windshield would really make it inexpensive!
@@ElectromagneticVideos Yes UK Wirral Nr Liverpool my best wishes to our loyal brave friends in Canada I do hope the fires are under control. Sealed beam (PAR) lamps came in the late 70's, we complained at the cost but conveniently forgot the corrosion on traditional reflectors and the reduce light output from the voltage lost in creating smoke in the Lucas wiring which killed the British car industry exports. When driving in France on the right (but wrong ) side of the road we had to cover a segment of the lamp to prevent glare, this had a reflective surface directing light back into the reflector. My anti glare solution was to just stick a segment of polarised filter where the focal point would be visible to on coming traffic. Anyway I am too old to lament the fortune I may have acquired from this invention Ha ha. I found an article on the first diy LCD clock in Practical Electronics, at that time I was not confident to build such a device also it was expensive however I thought about the polarising properties and made a welding shield from some polarising film stuck to a salvaged LCD connected to a solar cell. that very simple circuit work well blocking the arc effectively. That device came to market some fifteen years after my prototype, another lost opportunity for wealth. Another Car improvement was to unload the Alternator when accelerating to make most of the limited engines power. This was simply a pressure switch ( from a Prestcold dishwasher ) on the throttle body that opened the rotor circuit killing the magnetic field, worked a treat recovering about 3 to 4 horsepower when you needed to impress your friends in a 1978 54 HP Ford Fiesta. Now they make a very complicated microprocessor controlled alternator with free wheel pulley which usually fails during the family holiday. Progress. The Methanol injection is a story for another day.
That's very surprising. I know a little bit about the 2 layers and only learned about the polarized films difference on LCD screens while working on a friend's jetski display a couple of years ago in a video. I thought it was very interesting the effect turning the polarized layer 90⁰ had. I had no idea about the 3rd lens. I always learn something. Thanks!
Glad you liked it Phillip! LCDs - I extracted a nice large polarized filter from a broken computer monitor - might do a video about how to do that this winder. polarized filters like that should work better than sunglasses - the sunglass tinting absorbs so much light.
I am not a rf expert by any means but I recall seeing various types of antenna. Some were vertically polarised others horizontally and others in a spiral manner. I wonder if the science is similar here. The radio waves travel in rotating fashion and you can see it by looking at the antenna design. I wonder if the middle lenses somehow manages to twist the light so it begins to rotate and have screw type waveforms
You could be an RF expert based on you observation of antennas! Its exactly the same as radio waves. The antennas you are probably thinking of are roof mounted Yagi antennas - the old TV antennas that used to be so common. They were typically mounted horizontally for horizontally polarized waves for TV (at least in Canada and the US). The spiral ones are circularly polarized. I had heard some places in Europe used circular polarization for analog TV - not sure if that true (anyone know?). If they did, they were really smart: a circular wave reflected from a surface like the side of a building is gets the opposite polarization direction from the original, so a circular receive antenna does not receive the refection. There actually are materials that generate circular polarized light from linear polarized light (look up birefringent if your interested) . They are commonly used on the camera side of photography polarizing filters so that the polarized light from the polarizing filter does not react unexpectedly with often some polarizing optical elements in the camera (ie the prism in a DSLR).
I now have a use for all those broken polarized sunglasses that i threw into a box! (I have saved a few by combining parts) Can quantum theory explain why breaking a left vs right eyeglass temple seems random? Or why a right sock vs left sock disappears? Thanks for the interesting and nicely demonstrated video!
Enjoyed the video! LCDs have a polarizing filter as well. Then the liquid crystal arranges to make a “twist” and blocks the light. I wonder if I look through my one pair of known polarized glasses at a black digit on my clock and rotate would the digit get lighter. I’m wanting to go try!
It should. Leading up to this video, I extracted a nice large polarizing filter from an old computer monitor. In the end I didn't use it because I felt sunglasses only was a better for the these of no special equipment. I may eventually do a video of extracting polarizing filters from old monitors. At my local Habitat Restore, an old monitor sells for $5 - way less than a large polarizing filter.
@@5cyndi Way better to re-use than just trash stuff. The issue I had with the monitor was the second polarizing filter was stuck to a tinted glass front panel so well that the glass would break when trying to separate them. Not sure if all are built that way.
@@johnclawed Your right! I dont think I fully appreciated/understood the original comment that started this thread. You certainly do get funny effects with polarized glasses/filters in front of LCD panels. When making this video and I had the camera on a tripod on the dock, I was irritated how dim the LCD display on the camera was in the bright sunlight - until I realized I was wearing polarized sunglasses and took them off. Amazing how bright the camera's LCD actually was!
Well, in my experiment just now i didn’t get the result I thought but I learned something; my LCD clock is diagonally polarized 45°. I assume like in a car you don’t want to have your display blocked by your sunglasses so they compromised. Anyway the part that didn’t work as expected was that the glasses rotated clockwise 45° in front of the LCD clock display made the display completely black and at no point were the digits lighter than the background. I suspect it’s because I’m looking at the light going through the glass twice both into and reflected back out of the polarized glass.
Very interesting about the display in the car being at a 45 degree angle. Didn't know that! When I was filming the video I was having a hard time seeing LCD viewfinder on the camcorder and first thought it was the bright sunlight - until I realized I had the sunglasses on. So on the camcorder the light exiting the LCD was horizontally polarized. I dont know if that's typical or not.
@@ElectromagneticVideos Right, I only can tell you based on my own samples, but it definitely seems like an important automotive “User Experience” consideration, 😄 so I wonder as well whether or not that is widespread.
@@ElectromagneticVideos When I dissected an LCD as a kid, I discovered that the front and back filters were at opposing 45 degree angles by flipping one filter over. Then its angle would not have been changed if it was vertical or horizontal, but it was changed. It might not always be that way, and the glasses might be at 45 degrees. You have to look through the glasses backwards to be sure.
I wonder if this also work with the 3D glasses from a movie theater. The ones used here (Denmark) uses circular polarization, and I have a few pairs.. Will have to try this out at some point - thanks
That is interesting! So I assume the image for one eye is clockwise polarized and the other is anti-clockwise polarized, right? It should work (that is put a linearly polarized filter between clockwise and anti-clockwise polarized lenses). Unlike the linearly polarized example, it should be explainable with classical EM theory. If you try it, I would be thrilled to hear the results!
This is my understanding, the Red is one plane and the Blue the other and some systems switch a polarising shutter. Egon Film projector formats is a fascinating subject especially how different systems projected colour.
@@WOFFY-qc9te It is not the Red/Blue colored glasses used in theaters here, it is passive - circularized polarized - plastic glasses, so they filter out either left/right polarization - giving the viewer a 3D impression, no matter how they orient their heads, etc. Some home-theater system use/used active glasses, requiring batteries - which then switched on/off liquid crystals in the glasses. Theaters here use 'cheaper' passive glasses, and as a bonus they're also nicer to wear as they're lighter and don't require power.
@@ElectromagneticVideos Yes, left hand/right hand - or clock/anti-clock polarized, I guess depending on how you describe it. I will give it a go when the sun is shining - right now it is not (well, it is - above a ton of clouds :ø) I will get back to you, hopefully in a few days
Soo, I huv a queston. Why do we need a third set of glasses to show this effect? Because if after first set of glasses we have perfectly polarized light, than if this effect not exists then alredy after second set of glaases we are going to see black image at any angle, except of when second set of glasses oriented exactly like first, and thus to show this effect its enough to have 2 set of glasses and we dont need 3rd set.
No quite - look at where there are just two passes and I rotate one - at 45 degrees it allows half the light through. In classical EM, thats the vertical part of the diagonally polarized light getting though. Now when the two glasses are at 90, none gets though. But add in a the third in between at 45 degrees and suddenly some light gets though which should be possible since the middle sunglasses alsosimple liner polarizing filters. But with the quantum theory approach where the individual photons have a natural uncertainty around the direction they are supposed to be polarized does result in some getting though when the 3rd filter (glasses) is inserted.
@@ElectromagneticVideos Yes, but in the case with only 2 glasses first glass passes only vertical polarized light, how classic theory explains that those vertical waves fit into tilted second glasses, like at 25 degrees without rotating polarization? I mean for example if you have vertical grating and you have a knife it will only go trough grating if knife itself vertical, and if your grating is tilted then knife would not pass trough it unless it tilts itself. So by my example light also should tilt somewhat, just like you said, to pass through second polarized glass. And as I understood from your explanation light could only tilt by uncertainty principle. Lets make a thought experiment with only 2 glasses: first one is vertically polarized and second one is tilted by 45 degrees. After first glass all the light going to be vertically polarized, but we still can see some light after second glass and we know for sure that after second glass its 45 degrees polarized. Which means light changes the tilt somewhere after first glass but before it pass trough second.
@@Uterr Simply put, in classic theory, once one polarization is selected by the first filter, that is the only polarization that can continue though to the end. The following filters all reduce the level of that polarization further based on how more or less misalighed it is with each of the following filters. It looks like I garbled the classicall em discussion when trying show how the diagonal light partially gets though because it is in partial alignment with the vertical filter. Sorry about the confusion!
Thank you so much! The graphics (and thumbnails) are a struggle for me - I'm much more of an engineer and scientist than graphic artist. Gradually learning how to improve that aspect of videos.
I garbled the classicall em discussion when trying show how the diagonal light partially gets though a 45 degree rotated polarizing filters. Simply put, in classic theory, once one polarization is selected by the first filter, that is the only polarization that can continue though to the end. The following filters all reduce the level of that polarization further based on how more or less misaligned it is with each of the subsequent filters. Sorry about the confusion!
In the 70's I found some polarised film and had the idea of fitting it to car head lamps in the vertical plane and using un-tinted polarised glasses at night. It worked very well and I was surprised that car makers did not install polarised windscreens and headlights. Interesting video thanks. I will have a play after I have found Schrodinger the cat.
What a great idea - particularly back then. It would be so great if they did that. I wonder if besides cost(always a key factor) the issue is the 50% dimming of everything at times like dusk? Very cool you tried it.
With polarized film being produced in large quantities for LCD displays, it probably would not be that expensive to do today.
@@ElectromagneticVideos Good point on cost, what I found was a small area of film over the focal point reduced the glare so your vision was not compromised I suppose the more open iris compensated for the reduced light emission. I only had my chums dad's Cortina to have as a test subject. I remember the very first LCD display in Practical Electronics and that is where I got the idea.
@@WOFFY-qc9te Your in the UK, right? The geniuses over here in Canada and US until recently required sealed beam headlights (reflector internal to the bulb), as opposed to bulb and reflector used in the UK and everywhere else. So over here each complete headlight lamp would need a internal filter, or a big one in front of the sealed beam headlight. So the extra headlight cost would have been a one time thing in the UK and reoccurring cost over here.
Your approach and maybe wearing "nightglasses" rather than a polarized windshield would really make it inexpensive!
@@ElectromagneticVideos Yes UK Wirral Nr Liverpool my best wishes to our loyal brave friends in Canada I do hope the fires are under control. Sealed beam (PAR) lamps came in the late 70's, we complained at the cost but conveniently forgot the corrosion on traditional reflectors and the reduce light output from the voltage lost in creating smoke in the Lucas wiring which killed the British car industry exports.
When driving in France on the right (but wrong ) side of the road we had to cover a segment of the lamp to prevent glare, this had a reflective surface directing light back into the reflector. My anti glare solution was to just stick a segment of polarised filter where the focal point would be visible to on coming traffic. Anyway I am too old to lament the fortune I may have acquired from this invention Ha ha.
I found an article on the first diy LCD clock in Practical Electronics, at that time I was not confident to build such a device also it was expensive however I thought about the polarising properties and made a welding shield from some polarising film stuck to a salvaged LCD connected to a solar cell. that very simple circuit work well blocking the arc effectively. That device came to market some fifteen years after my prototype, another lost opportunity for wealth.
Another Car improvement was to unload the Alternator when accelerating to make most of the limited engines power. This was simply a pressure switch ( from a Prestcold dishwasher ) on the throttle body that opened the rotor circuit killing the magnetic field, worked a treat recovering about 3 to 4 horsepower when you needed to impress your friends in a 1978 54 HP Ford Fiesta. Now they make a very complicated microprocessor controlled alternator with free wheel pulley which usually fails during the family holiday. Progress. The Methanol injection is a story for another day.
That's very surprising. I know a little bit about the 2 layers and only learned about the polarized films difference on LCD screens while working on a friend's jetski display a couple of years ago in a video. I thought it was very interesting the effect turning the polarized layer 90⁰ had. I had no idea about the 3rd lens. I always learn something. Thanks!
Glad you liked it Phillip! LCDs - I extracted a nice large polarized filter from a broken computer monitor - might do a video about how to do that this winder. polarized filters like that should work better than sunglasses - the sunglass tinting absorbs so much light.
this is a must try!
It is - hope you get to do it. The less tinted the sunglasses you use, the better!
I am not a rf expert by any means but I recall seeing various types of antenna. Some were vertically polarised others horizontally and others in a spiral manner.
I wonder if the science is similar here. The radio waves travel in rotating fashion and you can see it by looking at the antenna design. I wonder if the middle lenses somehow manages to twist the light so it begins to rotate and have screw type waveforms
You could be an RF expert based on you observation of antennas!
Its exactly the same as radio waves. The antennas you are probably thinking of are roof mounted Yagi antennas - the old TV antennas that used to be so common. They were typically mounted horizontally for horizontally polarized waves for TV (at least in Canada and the US). The spiral ones are circularly polarized. I had heard some places in Europe used circular polarization for analog TV - not sure if that true (anyone know?). If they did, they were really smart: a circular wave reflected from a surface like the side of a building is gets the opposite polarization direction from the original, so a circular receive antenna does not receive the refection.
There actually are materials that generate circular polarized light from linear polarized light (look up birefringent if your interested) . They are commonly used on the camera side of photography polarizing filters so that the polarized light from the polarizing filter does not react unexpectedly with often some polarizing optical elements in the camera (ie the prism in a DSLR).
This video is a bit polarized.
Very good sir. You comment should be pinned.
:) Hopefully not as polarized as some politics!
I now have a use for all those broken polarized sunglasses that i threw into a box! (I have saved a few by combining parts)
Can quantum theory explain why breaking a left vs right eyeglass temple seems random? Or why a right sock vs left sock disappears?
Thanks for the interesting and nicely demonstrated video!
That would be a great thing to do with them. If you have ones that have less tint, those are the ones to use!
Very interesting! WOW I never knew 😂
Glad you found it interesting. I have no idea why I only see you comment a week after you posted it :(
Enjoyed the video! LCDs have a polarizing filter as well. Then the liquid crystal arranges to make a “twist” and blocks the light. I wonder if I look through my one pair of known polarized glasses at a black digit on my clock and rotate would the digit get lighter. I’m wanting to go try!
It should. Leading up to this video, I extracted a nice large polarizing filter from an old computer monitor. In the end I didn't use it because I felt sunglasses only was a better for the these of no special equipment.
I may eventually do a video of extracting polarizing filters from old monitors. At my local Habitat Restore, an old monitor sells for $5 - way less than a large polarizing filter.
@@ElectromagneticVideos wow that’s my kind of deal. It’s fun to reuse things that I have to remove (DIY home stuff)
@@5cyndi Way better to re-use than just trash stuff. The issue I had with the monitor was the second polarizing filter was stuck to a tinted glass front panel so well that the glass would break when trying to separate them. Not sure if all are built that way.
@@ElectromagneticVideos Wait a minute. The sunglasses would not be between the LCD filters, so they couldn't lighten an already dark segment.
@@johnclawed Your right! I dont think I fully appreciated/understood the original comment that started this thread. You certainly do get funny effects with polarized glasses/filters in front of LCD panels. When making this video and I had the camera on a tripod on the dock, I was irritated how dim the LCD display on the camera was in the bright sunlight - until I realized I was wearing polarized sunglasses and took them off. Amazing how bright the camera's LCD actually was!
Well, in my experiment just now i didn’t get the result I thought but I learned something; my LCD clock is diagonally polarized 45°. I assume like in a car you don’t want to have your display blocked by your sunglasses so they compromised. Anyway the part that didn’t work as expected was that the glasses rotated clockwise 45° in front of the LCD clock display made the display completely black and at no point were the digits lighter than the background. I suspect it’s because I’m looking at the light going through the glass twice both into and reflected back out of the polarized glass.
Very interesting about the display in the car being at a 45 degree angle. Didn't know that! When I was filming the video I was having a hard time seeing LCD viewfinder on the camcorder and first thought it was the bright sunlight - until I realized I had the sunglasses on. So on the camcorder the light exiting the LCD was horizontally polarized. I dont know if that's typical or not.
@@ElectromagneticVideos Right, I only can tell you based on my own samples, but it definitely seems like an important automotive “User Experience” consideration, 😄 so I wonder as well whether or not that is widespread.
@@5cyndi It certainly is something that is easy to test - I will make a point of trying sunglasses with various others LCDs.
@@ElectromagneticVideos When I dissected an LCD as a kid, I discovered that the front and back filters were at opposing 45 degree angles by flipping one filter over. Then its angle would not have been changed if it was vertical or horizontal, but it was changed. It might not always be that way, and the glasses might be at 45 degrees. You have to look through the glasses backwards to be sure.
@@johnclawed I never thought about the flipping over a 45 degree filter to block/unblock! Simple thing but a neat way of testing polarization angle.
I wonder if this also work with the 3D glasses from a movie theater. The ones used here (Denmark) uses circular polarization, and I have a few pairs.. Will have to try this out at some point - thanks
That is interesting! So I assume the image for one eye is clockwise polarized and the other is anti-clockwise polarized, right? It should work (that is put a linearly polarized filter between clockwise and anti-clockwise polarized lenses). Unlike the linearly polarized example, it should be explainable with classical EM theory.
If you try it, I would be thrilled to hear the results!
This is my understanding, the Red is one plane and the Blue the other and some systems switch a polarising shutter. Egon Film projector formats is a fascinating subject especially how different systems projected colour.
@@WOFFY-qc9te It is not the Red/Blue colored glasses used in theaters here, it is passive - circularized polarized - plastic glasses, so they filter out either left/right polarization - giving the viewer a 3D impression, no matter how they orient their heads, etc.
Some home-theater system use/used active glasses, requiring batteries - which then switched on/off liquid crystals in the glasses.
Theaters here use 'cheaper' passive glasses, and as a bonus they're also nicer to wear as they're lighter and don't require power.
@@ElectromagneticVideos Yes, left hand/right hand - or clock/anti-clock polarized, I guess depending on how you describe it.
I will give it a go when the sun is shining - right now it is not (well, it is - above a ton of clouds :ø)
I will get back to you, hopefully in a few days
@@EgonSorensen Great - look forward to hearing the outcome of the experiment!
Soo, I huv a queston. Why do we need a third set of glasses to show this effect? Because if after first set of glasses we have perfectly polarized light, than if this effect not exists then alredy after second set of glaases we are going to see black image at any angle, except of when second set of glasses oriented exactly like first, and thus to show this effect its enough to have 2 set of glasses and we dont need 3rd set.
No quite - look at where there are just two passes and I rotate one - at 45 degrees it allows half the light through. In classical EM, thats the vertical part of the diagonally polarized light getting though. Now when the two glasses are at 90, none gets though. But add in a the third in between at 45 degrees and suddenly some light gets though which should be possible since the middle sunglasses alsosimple liner polarizing filters. But with the quantum theory approach where the individual photons have a natural uncertainty around the direction they are supposed to be polarized does result in some getting though when the 3rd filter (glasses) is inserted.
@@ElectromagneticVideos Yes, but in the case with only 2 glasses first glass passes only vertical polarized light, how classic theory explains that those vertical waves fit into tilted second glasses, like at 25 degrees without rotating polarization? I mean for example if you have vertical grating and you have a knife it will only go trough grating if knife itself vertical, and if your grating is tilted then knife would not pass trough it unless it tilts itself. So by my example light also should tilt somewhat, just like you said, to pass through second polarized glass. And as I understood from your explanation light could only tilt by uncertainty principle.
Lets make a thought experiment with only 2 glasses:
first one is vertically polarized and second one is tilted by 45 degrees.
After first glass all the light going to be vertically polarized, but we still can see some light after second glass and we know for sure that after second glass its 45 degrees polarized. Which means light changes the tilt somewhere after first glass but before it pass trough second.
@@Uterr Simply put, in classic theory, once one polarization is selected by the first filter, that is the only polarization that can continue though to the end. The following filters all reduce the level of that polarization further based on how more or less misalighed it is with each of the following filters. It looks like I garbled the classicall em discussion when trying show how the diagonal light partially gets though because it is in partial alignment with the vertical filter. Sorry about the confusion!
Your videos are great but better thumbnails could do magic in terms of views.
Thank you so much! The graphics (and thumbnails) are a struggle for me - I'm much more of an engineer and scientist than graphic artist. Gradually learning how to improve that aspect of videos.
I'll be damned. Thanks
Your welcome! amazing, isnt it!
@@ElectromagneticVideos It sure is. As is your content good sir 🤘🏽🙂
@@lotusflowerrr Well thank you so much!
What about 🌹?
? Oh - rose colored glasses :)
I'm not going to sleep now
Or maybe you will sleep in one universe and not in another :)