6 ms·
Where is the video? That's what I'm looking for
by ttty 8y ago
Where is the video? That's what I'm looking for
- thanatos_dem 8y agoHere’s a video from 2011, but it’s only at 1 trillion FPS using the same laser pulse approach - https://m.youtube.com/watch?v=-fSqFWcb4rE https://m.youtube.com/watch?v=-fSqFWcb4rE Also, the music is pretty cringey, so I’d just leave it muted...
- SketchySeaBeast 8y agoWatching this confuses me as to the timing of it all... if the conceit is that we're watching the bundle of photons move through the bottle that's because the photons from the source are hitting the camera, right? So is it the light moving through the bottle + the travel time to the sensor? Should refraction and reflection across the surface cause a lot of weird visual interference (as the bottle's size is no longer insignificant the time scale for lights velocity)? Is that what we're seeing there?
- lawlessone 8y agoIt kinda is, but as far as i know they're actually taking the multiple photos separately of different pulses and editing them into one video.
- CPLX 8y agoIs there another method of making a video?
- IanCal 8y agoYes, normally to video a car going past I'd take a series of photos as it goes past once. The approach here would be to take a photo of a car, then drive the car past again from the start and take another photo slightly later, then again, and again driving it past hundreds of times. They split this up even more, but I think the basic analogy holds to show the key difference.
- irisli 8y agoThe team behind the video of the coke bottle has a TED talk that explains it in detail: https://www.youtube.com/watch?v=Y_9vd4HWlVA https://www.youtube.com/watch?v=Y_9vd4HWlVA Edit: oops I misread your comment
- stestagg 8y agotaking one video of one pulse, and not editing it
- deleted 8y ago[deleted]
- zenojevski 8y agoWhen the light reaches the camera, it has already moved roughly the same amount forward through the bottle. So my guess is yes, each frame is visibly showing "the past". My guess is also that, if the laser is really focused, and if the bottle wasn't in the way, refracting some light back to the camera, we wouldn't even be able to see anything.
- jcims 8y agoI had this similar realization when I watched that video from 2011 the first time around (hard to believe it was 7 years ago). It also gave me this odd sense of blindness, in that I cannot actually see what's in front of me, only what literally interacts with my retina, almost like it's made of tastebuds for light. Still weirds me out when i think about it.
- plasticchris 8y agoYour eyes are terahertz radio receivers!
- debt 8y agoOnly 1 trillion FPS? Yawn
- TaylorAlexander 8y agoI believe the approach in your video relies on a single laser pulse per frame, with many laser pulses combined to create the series of images for the video. The new approach, in contrast, emphasizes that the capture is done using a single laser pulse captured sequentially in real time.
- magicalhippo 8y agoThere's some cool videos at the end of this article. Not the article posted, but similar concept if I understood correctly. Observation of laser pulse propagation in optical fibers with a SPAD camera https://www.nature.com/articles/srep43302 https://www.nature.com/articles/srep43302 http://i.giphy.com/3og0IQ5k6PP9KspN9m.gif http://i.giphy.com/3og0IQ5k6PP9KspN9m.gif (gif version of one of the mov files)
- jjeaff 8y agoI believe this one is related. 1 trillion fps. https://m.youtube.com/watch?v=EtsXgODHMWk https://m.youtube.com/watch?v=EtsXgODHMWk
- _sigma 8y agoThe paper is OA, and the supplemental has the videos. S5 and S6 are the best. https://www.nature.com/articles/s41377-018-0044-7#Sec14 https://www.nature.com/articles/s41377-018-0044-7#Sec14
- InclinedPlane 8y agoThey're uploading the raw files, it's only 37 exabytes, but it'll be a while.
- plasticchris 8y agoIt makes you wonder what the memory bandwidth is like in their capture rig