"further increasing frame rates using CCD or CMOS technology is fundamentally limited by their on-chip storage and electronic readout speed. Here we demonstrate a two-dimensional dynamic imaging technique, compressed ultrafast photography (CUP), which can capture non-repetitive time-evolving events at up to 10^11 frames per second. Compared with existing ultrafast imaging techniques, CUP has the prominent advantage of measuring an x–y–t (x, y, spatial coordinates; t, time) scene with a single camera snapshot, thereby allowing observation of transient events with temporal resolution as tens of picoseconds. Furthermore, akin to traditional photography, CUP is receive-only, and so does not need the specialized active illumination required by other single-shot ultrafast imagers."
A figure below explains the camera principle:
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| CUP image formation model. |
The two videos below demo the fast camera performance on laser pulse reflection from a mirror and laser pulses racing in different media:
The above Images have a similar appearance to low resolution Thermal Images.
ReplyDeleteThe ICCD method is 100x slower but the Image is far more realistic (not a blob). Hamamatsu claims it can do 1 Frame in 5 ns and two within a 1 µs interval. The Stanford Computer Optics group also claims down to 200 ps using ICCD.
I saw an image of one of these Cameras capturing a laser beam traveling down a Fiber but I can not find the Link. (It looked like a slinky in a tube).
This is a great subject to cover, thanks for the Article.
Gated Image Intensifier with CCD
http://www.hamamatsu.com/us/en/C11370-10-1.html
Standford's "4 Picos ICCD Camera"
http://www.stanfordcomputeroptics.com/download/Brochure-4Picos.pdf