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1,000,000,000,000 Frames/Second Photography
Edvard:
Yeah, when I saw that, I was like "WAITAMINNIT!!!..."
- How did they get the shutter to open and close fast enough?? You would have to do it faster than the speed of the photon packet, which is physically impossible. WTH??
- How did they get a picture of a photon packet traveling through a transparent object when you need those very same photons striking the image sensor to take the picture?? By the time any photons scattered off the semi-transparent plastic and particulate in the water, the packet would be already gone.
Then I heard the guy talk in the TED video about how it's actually a composite of a bunch of timed shots put together sequentially, and I understood how they did the actual video. So, it's not "real time" per se.
The answer to the second question is actually twofold and partially self-answering, and how I understand it is, (1) the 'packet' you see is in reality further along than where you see it at that particular frame because it still takes light more time to reach the image sensor than to travel down the length of the bottle, and (2) it's not an image of the actual packet, but the light from the packet that escaped as it went, refracting off the particulate in the water.
This, BTW is how we are able to see anything at all; we don't see the thing itself, just the light reflecting off of it.
Without the particulate and the semi-transparency of the bottle itself, you wouldn't see anything. Notice how at the beginning of the video, there is no light beam coming in before it strikes the back end of the bottle, where photons start scattering.
Cool stuff, anyhow :Thmbsup:
superboyac:
Yeah, when I saw that, I was like "WAITAMINNIT!!!..."
- How did they get the shutter to open and close fast enough?? You would have to do it faster than the speed of the photon packet, which is physically impossible. WTH??
- How did they get a picture of a photon packet traveling through a transparent object when you need those very same photons striking the image sensor to take the picture?? By the time any photons scattered off the semi-transparent plastic and particulate in the water, the packet would be already gone.
Then I heard the guy talk in the TED video about how it's actually a composite of a bunch of timed shots put together sequentially, and I understood how they did the actual video. So, it's not "real time" per se.
The answer to the second question is actually twofold and partially self-answering, and how I understand it is, (1) the 'packet' you see is in reality further along than where you see it at that particular frame because it still takes light more time to reach the image sensor than to travel down the length of the bottle, and (2) it's not an image of the actual packet, but the light from the packet that escaped as it went, refracting off the particulate in the water.
This, BTW is how we are able to see anything at all; we don't see the thing itself, just the light reflecting off of it.
Without the particulate and the semi-transparency of the bottle itself, you wouldn't see anything. Notice how at the beginning of the video, there is no light beam coming in before it strikes the back end of the bottle, where photons start scattering.
Cool stuff, anyhow :Thmbsup:
-Edvard (August 21, 2012, 01:14 PM)
--- End quote ---
very nice explanation. I'm still trying to wrap my mind around how photons are able to carry the information they do. I know there's probability involved, and I've tried understanding the math behind it...but all the probability functions can't really explain how photons carry their particular information. But that quickly leads to the never ending mass/gravity problems.
Arizona Hot:
They also did this: A camera that can see around corners. The video for that is here and here.
KynloStephen66515:
Such a shame, I felt the need to make a gif for it.
Arizona Hot:
Such a shame, I felt the need to make a gif for it.
-Stephen66515 (November 28, 2012, 05:21 PM)
--- End quote ---
What gif?
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