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Coherent summation of spatially distorted laser Doppler signals by using a two-dimensional heterodyne detector arrayPhase-sensitive coherent summation of individual heterodyne detector array signals was demonstrated for the enhanced detection of spatially distorted laser Doppler returns. With the use of a 2 x 2 heterodyne detector array, the phase and amplitude of a time-varying speckle pattern was detected, and the signal-to-noise ratio of the Doppler shift estimate was shown to be improved by a factor of 2, depending on the extent of spatial coherence loss. These results are shown to agree with a first-order analysis and indicate the advantage of coherent summation for both short-range laser Doppler velocimetry and long-range atmospheric coherent lidar.
Document ID
19920071899
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chan, Kin P.
(NASA Langley Research Center Hampton, VA, United States)
Killinger, Dennis K.
(South Florida, University Tampa, FL, United States)
Date Acquired
August 15, 2013
Publication Date
September 1, 1992
Publication Information
Publication: Optics Letters
Volume: 17
Issue: 17, S
ISSN: 0146-9592
Subject Category
Lasers And Masers
Accession Number
92A54523
Distribution Limits
Public
Copyright
Other

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