1989-04-17
1990-12-04
Arnold, Bruce Y.
350 36, 350 382, G03H 116, G03H 102
Patent
active
049749200
ABSTRACT:
The invention relates to holography and more particularly to an electronic holographic apparatus whose electrical output represents the magnitude and phase of coherent light reflected from a three-dimensional object and distributed over the aperture of the apparatus. The apparatus provides a coherent beam which illuminates the object to create a speckle pattern in an aperture bounding an optical sensing arrangement. A reference beam derived from the same source as the illuminating beam illuminates the sensing aperture directly and creates fringes in the speckle pattern. The optical sensing arrangement consists of a charge injection device (CID) camera with plural optical detectors arranged in relation to the speckle pattern to sense the magnitude and spatial phase of each speckle (on the average). The sampled outputs of the CID detectors are processed to isolate the magnitude and phase information representing the complex optical wavefront of the hologram from irrelevent terms created by the interference process. The detected information may be used for such purposes as imaging, interferometry, matched filtering or correlation.
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"Laser Speckle and Related Phenomena", edited by J. C. Dainty w/contributions by J. C. Dainty, A. E. Ennos, M. Francon, J. W. Goodman, T. S. McKechnie and G. Parry-vol. 9 of Topics in Applied Physics/Springer-Verlag, 1984, pp. 232-236.
Chovan Joseph
Engeler William E.
Penn William A.
Tiemann Jerome J.
Arnold Bruce Y.
Checkovich Paul J.
General Electric Company
Jacob Fred
Lang Richard V.
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