Image Information by Means of Speckle Pattern Processing
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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When a laser beam is reflected from a diffuse surface, a granular scattering distribution is commonly observed, called a speckle pattern. The author discusses some of its ramifications 1 that this pattern is the time- dependent analogue of the signal used in the classic Hanbury Brown - Twiss stellar interferometer of the 1950s 2 that this pattern can be processed by standard incoherent optical techniques to yield information pertaining to the object radiance distribution 3 that this same signal, when processed by coherent-optical techniques, is equivalent to the Gabor on-axis hologram or the Fourier-transform hologram, depending on the specific source configuration and 4 that signals processed by all of the above techniques are comparatively insensitive to atmospheric turbulence. An experiment is performed to illustrate the procedure of item 2 and then modified to show assertion 4.