I hope the "younger" generation watches your videos and becomes curious to learn more. This is a first class demonstration of the polarization of light.
I've made 1-2-3 blocks before and the optical breadboard seems like an interesting project that is an almost really large scale 1-2-3 block that maybe someone in a machine shop or machine shop at a school can make more cost effectively than purchasing. Especially when made with recycled material like some have locally from say around where I am at the moment... the Schupan Boneyard: schupanboneyard.com/ps/schupan_boneyard_aluminum_and_plastics_catalog.cfm#SIG=STAI
styropyro Congrats on the Motherboard docu. I'm glad you also had chance to get the point across about science / educational channels getting videos taken down just for a few reports about the perceived "danger". Keep up the good work. P.S. Great to see you back, Jeri.
The optical bench brings back memories for me. I used to work in telecoms factories, mainly building passive optical mux / demux devices, but also splicing some EDFA (Erbium-Doped Fibre Amplifier) stuff. It was quite interesting, but I don't think they ever mentioned the hazards of us staring directly at the IR beams for months on end. I know it was probably only a few mW, but we were never given goggles. Mikeselectricstuff is an amazing channel. Agreed. Everyone should also watch his presentation on the Eidophor... ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-3-BvMcqEc98.html
Thanks for returning Jeri.. I love your explations, often on subjects or devices I never knew existed. Interesting stuff. Keep it up Please! Are you still doing any pinball projects, would love to see collection?
@@jeriellsworth Hello, I just discovered your channel, I am impressed with your knowledge and easy to follow style, also I'm slightly smitten. I hope you do more videos soon. We have a number of common interests and I appreciate what you have accomplished and I understand how difficult it is to make a good video. To teach and share as YOU do is commendable as well as a great gift, and I want you to know that. 73's KI7TWX
I am quite at a loss to know how to speak to such a genius as yourself - you who have made transistors yourself and was not overly concerned about hydroflouric acid. Some years ago I taught myself enough electronics to be able to automate model railways, and it was while this was going on that I first came across your wonderful videos on youtube. I also sent off on ebay for that joystick with the c64 games on it (long before the c64 mini). I am not an electronics genius, I just learnt a bit about how to use voltage comparators for sensing, to use TIP 120 NPN transistors to switch stuff on and off, motor controllers & c. I did reprogram a DCC system so that it could make use of the timer 0 interrupt to do useful stuff like populating the serial buffer & processing the DCC packet buffer....I am not a practical person though, so my wiring is rubbish. Trying to use fibre optics to get the LED lights to go into the inside of buildings without the hassle of soldering loads of wires (the LEDs I will just plonk into a breadboard), but, damn, the light emerges as tiny ineffectual pinpoints - sort of ok for on the side of buildings though. You inpsire me though to figure out a solution. You are a hero to many.
that optical breadboard is very swanky, your equipment and endless knowledge is incredible, and mike’s channel has been a favorite since big clive recommended the video wherein mike exploded an rcbo/gfci. utterly spectacular.
You make the complicated look simple. Have you ever considered being a teacher? You would be brilliant! Thank You for taking the time to make all these fascinating videos.
An enthusiastic seconding of the teacher suggestion. Many alternatives to being a traditional teacher as well, such as mentoring for STEM and First programs or even just being a mentor for that special science or engineering minded student needing some support. The school counselor would have great ideas.
Today I learned about polarization conversion systems and a potential source for them (broken/discarded projectors and VR-headsets). Until now I looked for broken/discarded LCD screens to get large sheets of polarization filters and completely ignored projectors. The next time I visit the electronic waste dumpster, I'll look for projectors too. One use for polarized light sources is photography. Everyone knows how some reflections can be removed with a polarization filter in front of the lens. This works because some of the natural light is polarized. If you want to take a picture with artificial light, put a polarization filter in front of the light source (or maybe such a polarization conversion system) to get rid of most reflections and glare.
I had no idea this kind of polarizer existed. Great demonstration with the two dots, that confirmed exactly what you had described in a very practical way. Feels like I'm back in physics class 😄
Fascinating stuff! What I've never been able to understand is circular polarization. I can understand the photons of light all oscillating in one plane or another with traditional polarization, but spinning in a circle and still being polarized boggles my mind.
What's even more fun is to pass light through a third polarizer. With one left to right and one up and down no light gets through. Add the third at a oblique angle and the light reappears. Saw this demonstrated many many years ago on "The Mechanical Universe". Here's a link to the video. Yes, it's probably older than half of you watching it but still very informative. The lecture that covers it starts around 20 minutes. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-STJbtg-p4EA.html
might be worth stating that the third oblique filter needs to be between the two original perpendicular filters. interesting video, for anyone who wants to skip to the demo it's the last 4 mins or so.
Ever since I found that out as a kid when playing with polarizers (salvaged from calculators or generally any stuff with LCDs), this has become one of my favorite "weird" physics experiments.
@@superdau It is a cool and weird experiment much like the double slit experiment where a beam of light passing through two slits makes a series of bars of light appear on the surface behind it.
therealnightwriter It’s not due to reflection. The probability of a photon passing is the cos^2 of the angle between the polarizer and the photon’s electric field. Furthermore, after passing through (if it does), the photon assumes the polarization of the polarizer (hence the name polarizer is apt, rather than just polarized filter). With only two orthogonal filters all of the light that propagated through the first filter is blocked by the second filter because cos(90 deg)=0. Introduce the third filter in between at 45 degrees to both and you have a 50% chance of passage at each interface, so 12.5% of the light can pass through the aggregate filter set.
You are a smoking hot nerd with a great gift for teaching. Thanks for a great lesson on polarization. Combined with your experience in roll cages,cars, transponders and transducers- it would appear that you are well on your way to building a spaceship. The face you make when nerd thunder is mentioned totally cracks me up! XD
Hey, Jeri, try cross polarizing two filters to block most of the light, then add a third filter aligned like the first (i.e., sandwiching them). To your astonishment, and contrary to logic, the polarization of the first filter will be restored.
Thanks for the heart. I like your optics bench. Does it float? Maybe you should build an interferometer and try some experiments verifying Newton's law of gravity, or real image holograms - just a thought.
I stumbled across a weird effect with a camera polarising filter, I did the usual trick of stacking them and rotating one expecting a null. An effect I remember with polarised sunglasses. Strangely the camera ones behave differently when one is flipped over, sorry for the vague description. Love your videos, keep up the good work.
Great video. Thanks. Well, I am new to the polarisation of light but I do know that the laser light is related to spooky action at a distance. lasers have a unique way of moving even space-time if done correctly.
light magic. years a go i looked for a combining Lazar light Cristal and they did not have one at the time, you had to use a amp,, now i see there is one that adds half again the power to the original beam. i think this shows there is still a lot of room to create new things. i want that table for my computer desk :)
Beautiful device yes, thanks for the fascinating demonstration. But I really do hav to say what's beautiful is your crazy smart IQ. Thanks again, good job, keep sharing the knowledge.
That green laser light and the warm colour temperature setting of your camera makes this video look outright festive! It's our most favourite Jeri The Electronics Elf Ellsworth! :D I take it the converter you have there is a reject due to the two beams being misaligned, right? Or is this normal, and anyone using it will either have to see making them coaxial again, or will not bother because their application doesn't require them to be coaxial because there'd be some beam splitting involved anyhow?
Hi Jeri, thanks a lot for a great video. I really appreciate it. This is something that I have wanted to learn more about for quite some time. It would be great with more videos about optics. BTW, you have a very good way of presenting :)
Speaking of education you should wear safety glasses when bringing optics into the beam! I don’t know the power of the laser, but I assume it’s above eye safety ! The experiments are great ! Great video !
Great job ofc. This is very helpfull when riding motorbike or car and recording your speedo. Use one polarisation filter ⬆️ on speedo and other one on camera ➡️ problem with evidence of speeding is gone ;)
another great presentation Jeri, i learn so much from you. you have a great way of explaining complex subjects so less than genius people like me can understand. love ya lots:)
Back to your roots. I remember you from your core memory video. Brilliant! It's also amusing to read all the google eyed comments from smitten admirers. Enjoy it :)
Cam you comment on the small "screens?" I would normally expect a screen/target to be white, with some highly specialized material for optimal reflectivity. In this case black for optimal absorption?????
In a parallel universe not far from here, I finished my science degree and I'm watching this and going "Duh! I know all this!" But in most parallel universes I was too distracted by the computers in the CAD lab and switched my major to EE (which is what I always wanted to do but also didn't finish :-)
Since the efficiency of this device is better than half, does this mean that you can detect a single photons polarization? Does that break "quantum encryption" that relies on polarization?
Thanks for this post. It would be great if you could share some links to further information on the filters. Recently I’ve been teaching 2D & 3D animation & graphics at a school that includes a strong photography program where this information would be appreciated. *These filters could be mighty helpful in low-light situations in which opening the iris for more light unacceptably narrows depth-of-field.* Most Animation in the US is of course, now done with computer applications, but Producers such as Laika Films, producers of "Box Trolls," and Nick Parks, designer/director of "Wallace & Grommet" and "Chicken Run" use actual constructed sets and puppets with elaborate lighting set-ups where such filters could be mighty useful. When I first opened my tiny little animation studio I set up a simple camera stand with a fer-Pete's-sake used Bolex 16mm camera. *The stand held large polarizing sheets between the lights and the art stage. A small glass polarizing lens on the camera filtered out any stray light from scratches and dust on the layers of acetate overlays that made up all the animation art and a heavy glass platen mashing the whole stack flat to prevent unwanted cast shadows. *Animation is after all an elaborate HOAX, that requires just as much preparation as a Las Vegas Illusionist Act.* Anyhow, even with losing 3/4s of the light to the polarizing system, the suppression of all the diffusion sources resulted in much better color saturation all around. Just had to open up the Iris a couple of stops...
Wow second recording with heavy strike, hope you live in a Faraday cage Jerry ;-) I have polarize problem sometime when I have the sunglasses on when filling gasoline the polarize is blocking the LCD numbers from the gas pump :-) - -... ...- -
