Technology

60035 readers

3913 users here now

This is a most excellent place for technology news and articles.

Our Rules

Follow the lemmy.world rules.
Only tech related content.
Be excellent to each another!
Mod approved content bots can post up to 10 articles per day.
Threads asking for personal tech support may be deleted.
Politics threads may be removed.
No memes allowed as posts, OK to post as comments.
Only approved bots from the list below, to ask if your bot can be added please contact us.
Check for duplicates before posting, duplicates may be removed

Approved Bots

founded 2 years ago

MODERATORS

215

[AlphaPhoenix] built a 1,000,000,000 fps video camera to watch light move (www.youtube.com)

submitted 1 day ago by barsoap@lemm.ee to c/technology@lemmy.world

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.

you are viewing a single comment's thread
view the rest of the comments

[+] Mr_Blott@feddit.uk -22 points 1 day ago (4 children)

Fuckin YouTubers

Here's a 30 minute video of me waffling about 4 seconds of what you actually wanted to see

[–] astropenguin5@lemmy.world 7 points 13 hours ago

I mean, he does show the final product pretty early on. Plus as others said, the video (and most of the channel) is about how and why it works, which to me is much more interesting than the 4 second clip.

[–] MangoPenguin@lemmy.blahaj.zone 9 points 16 hours ago* (last edited 16 hours ago)

So you don't want to watch anything about how it's done or how it was built?

I suggest TikTok then. Or just don't click on things you don't really want to learn about.

[–] barsoap@lemm.ee 14 points 18 hours ago

You know there's a seek bar on youtube videos?

[–] dependencyinjection@discuss.tchncs.de 30 points 23 hours ago

Odd take.

I for one love AlphaPhoenix and I prefer longer form videos. I don’t want the look what I did, but I want the this is how I did it.

Piss off to TikTok if you just want to be mindlessly fed short form trash.