Friday, December 05, 2014

100 Giga-fps Passive Camera

Nature publishes "Single-shot compressed ultrafast photography at one hundred billion frames per second" paper by Liang Gao, Jinyang Liang, Chiye Li, and Lihong Wang from Washington University in St Louis, MO. While somewhat slower than the previously presented 4.4 Tera-fps system, the new camera is said to be completely passive. The abstract says:

"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:

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:

1 comment:

  1. The above Images have a similar appearance to low resolution Thermal Images.

    The 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 ┬Ás 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

    Standford's "4 Picos ICCD Camera"


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