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Novel Optics for Ultrafast Cameras Create New Possibilities for Imaging

Technique can capture a scene at multiple depths with one shutter click

Courtesy of B. Heshmat, M. Tancik, G. Satat, and R. Raskar
Rob Matheson
Tue, 08/28/2018 - 12:03
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MIT researchers have developed novel photography optics that capture images based on the timing of reflecting light inside the optics, instead of the traditional approach that relies on the arrangement of optical components. These new principles, the researchers say, open doors to new capabilities for time- or depth-sensitive cameras, which are not possible with conventional photography optics.

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Specifically, the researchers designed new optics for an ultrafast sensor called a “streak camera” that resolves images from ultrashort pulses of light. Streak cameras and other ultrafast cameras have been used to make a trillion-frame-per-second video, scan through closed books, and provide a depth map of a 3D scene, among other applications. Such cameras have relied on conventional optics which have various design constraints. For example, a lens with a given focal length, measured in millimeters or centimeters, has to sit at a distance from an imaging sensor equal to or greater than that focal length to capture an image. This basically means the lenses must be very long.

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