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So apparently buying a high speed camera wasn’t enough, because after two videos with it I decided to build my own, but 5 orders of magnitude faster…

In this video I’m filming the motion of light as it flies across my garage at… well, the speed of light! It’s fast. So fast that even with my best setup so far, I get 18 frames of video from one end of the room to the other, and those frames have a lot of temporal blur so realistically each “frame” is actually kind of an average of the information that by right should belong to 5-10 frames. It’s a mess, but it works.

I’m using the technique from the electricity waves video where I used repeated oscilloscope measurements synced after the fact to produce “videos” of electricity moving down a wire. The only difference is that instead of measuring electricity waves, I’m measuring light emitted by a laser, bouncing off the wall, traveling to my camera, and landing in the window of a photomultiplier tube. UNLIKE the electricity waves video, this setup (thankfully) is automated, and an optics assembly slews across angle space, building up a 3d dataset of video, collecting all the time information from each pixel sequentially.

It’s a really fun project that I’ve wanted to do for a long time, and just recently got pulled together.

Hope you enjoy!

Relevant AlphaPhoenix videos:
Electricity waves: https://www.youtube.com/watch?v=2AXv49dDQJw />Electricity waves (experimental details): https://www.youtube.com/watch?v=sty0Y1qmgEY />Replicating the original speed of light measurement: https://www.youtube.com/watch?v=YMO9uUsjXaI />
Massive thanks to my top Patreon supporters!
birdiesnbritts
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Chapters:
0:00 Intro – What’s a lightspeed camera?
2:30 Watch light move
3:43 Forming an image from many observations
6:20 Time-of-flight delay
9:52 The light has to turn on fast
14:14 The sensor has to turn on fast
18:23 Photomultiplier tubes
20:11 Building and testing the camera
23:56 Breaking the camera
25:00 Hero shots
27:23 Brilliant.org

Media Credits:
I Dunno by grapes is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/3.0/) http://ccmixter.org/files/grapes/16626

Arcadia – Wonders by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100326 Artist: http://incompetech.com/

Run by Ethan Meixsell – YouTube Audio Library License

Switched on Carcassi by Brian Bolger – YouTube Audio Library License

Disco Knights by Quincas Moreira – Youtube Audio Library License

Visualizing video at the speed of light — one trillion frames per second
Massachusetts Institute of Technology (MIT)
https://www.youtube.com/watch?v=EtsXgODHMWk />
The Waymo Driver navigating freeways
Waymo
https://www.youtube.com/watch?v=tgX7yzyfQ6E />
VFX Artists DEBUNK FLYING ORB UFO Videos
Corridor Crew
https://www.youtube.com/watch?v=39SJAcNXCzM />
“In a cave with a box of scraps” meme from Iron Man


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