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Ishoka

1 Trillion FPS: Light in Motion

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I posted this on FA, but wanted to share it here too. Its bloody amazing.

https://www.youtube.com/watch?v=SoHeWgLvlXI

Sequentially photograph light at the speed of light.
Viewed: 154 times
Added: 5 years, 12 months ago
 
DaddyDuckyBE
5 years, 12 months ago
What I see is a few computer animations, a Coke bottle in the dark that some guy is shining one and two lightsticks on, and a photo of the same coke bottle with some simple Photoshop color effects on it.

In short, I wanna have what the lecturer musta been smoking.
dmfalk
5 years, 12 months ago
Only half-right, there-- Computer animations, yes-- It's all reconstructed data, as at that speed and duration, there are far too few photons to detect for a coherent image, so instead, they do a sequence of about a million or so pulses of light, extracting the data from interference with itself and the original light pulse-- Not too dissimilar to laser holography, which produce 3D images by way of interference between originating light and reflected light from the same source. It is otherwise mechanically impossible to create femtosecond shutter speeds, so light itself is used to create the effect.

Were this realtime, the angle of refraction would not be constantly trailing with the surface reflection around the bottle- Particularly up by the neck, as the light would move forward, not still trailing. Instead, this is consistent with the delay the speed of light actually does have, even at that relatively short distance.

Since the info itself imparts absolutely no colour information, a colour photograph is superimposed for reference's sake.

Much more info on this (and other cool videos that even beat this, especially one with a tank of water) may be found at http://femtophoto.info :)

d.m.f.
comjuke
5 years, 12 months ago
HOLY F***
MrSOCKS
5 years, 12 months ago
FTL space-warp engines, here we come!
asuraludu
5 years, 12 months ago
That is some amazing photography.
BillySquirrel
5 years, 12 months ago
Cameras that can see inside you without xrays would be a big deal. Our medical tech is still nowhere near as advanced as our weapons. We need every breakthrough we can get.
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