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Dec 9th, 2013
One photon per pixel produces 3-D lidar image
With the detection of a single photon from each pixel location, a new lidarlike system can gauge depth and produce 3-D images. The technique is expected to be broadly applicable to microscopy and remote sensing.
Lidar rangefinders are commonly used in applications such as surveying and autonomous vehicle control. The system gauges depth by emitting short bursts of laser light and measuring the time it takes for the reflected photons to arrive back and be detected.
Fig 1: An example of a conventional lidar scanner that gauges depth by emitting laser light and measuring the time it takes for photons to rebound. MIT researchers developed a lidarlike system that can gauge depth by measuring only a single reflected photon. Photo courtesy of Wikipedia.
The new lidarlike system, developed at MIT's Research Laboratory of Electronics (RLE), requires 100 times less light to infer depth, meaning it could result in substantial savings in energy and time, both of which are at a premium in autonomous vehicles trying to avoid collisions.
To read more : http://www.photonics.com/Article.aspx?AID=55422
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