this post was submitted on 20 Dec 2024
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206
[AlphaPhoenix] built a 1,000,000,000 fps video camera to watch light move (www.youtube.com)
submitted 1 day ago by [email protected] to c/[email protected]
14 comments fedilink hide all child comments
 

blurb:

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.

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[–] [email protected] 8 points 16 hours ago

Once you go 1mil fps you can't go back

[–] [email protected] 35 points 23 hours ago (1 children)

If you liked this definitely checkout some of his other videos. At the level of work that he does you have to have a really solid model of reality and a lot of learned experience of how to measure and manipulate at extreme scales. He makes it look easy but this kind of thing really isn't. Just a lot of fun seeing such a talented and educated person do a really neat demonstration.

[–] [email protected] 17 points 22 hours ago (2 children)

Notably, he's also the inventor of the magneto-turboencabulator.

[–] [email protected] 1 points 2 hours ago* (last edited 2 hours ago)

Nice, I remember encountering a sales pitch for an earlier version of this sort of device:

https://youtu.be/RXJKdh1KZ0w?si=xxQJwvBtMWTTyJF_

[–] anomnom 6 points 18 hours ago

The description that boiled down to, it squeaks, was really well written.

Also it was released on the perfect date.

[–] [email protected] 27 points 1 day ago

I just watched this a few hours ago and it's really cool! I never thought something of this speed would be possible in a garage with $1k or so in parts.

[–] Hideakikarate 15 points 1 day ago* (last edited 1 day ago) (1 children)

I remember this being a thing several years ago. The researchers in the video I originally saw used a Coke bottle.

[–] [email protected] 11 points 18 hours ago

Yes he talks about that in the video. The researchers used $500k+ of equipment. He built a similar thing for under $1k

[–] [email protected] 5 points 1 day ago

Neato