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Proceedings Paper

Laboratory investigation of aberration recovery for Doppler heterodyne
Author(s): Laura J. Ulibarri; James K. Boger; Matthew P. Fetrow
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Paper Abstract

A laboratory investigation into Doppler heterodyne imaging is presented. Heterodyne detection involves beating a temporally modulated laser beam with a local oscillator. The primary advantage of this technique is that it allows measurements to be taken at low SNR levels. In heterodyne imaging, a series of temporally modulated far-field speckle patterns is measured, and demodulated to form the 2- dimensional complex field. The complex field data is inverse Fourier transformed to create a speckled image of the coherently illuminated target. Rotating targets cause the beat frequency to be Doppler broadened, and target information is encoded into temporal frequencies determined by the associated Doppler shift from which velocity information can be recovered. A significant limitation of heterodyne array imaging is that, in its fundamental form, it is sensitive to phase aberrations in the propagation path. We investigate a method whereby information on the imaging system aberrations may be obtained, and good images recovered in the presence of phase aberrations. Recoveries of laboratory data using Doppler heterodyne at high and low SNR levels are presented.

Paper Details

Date Published: 25 October 1996
PDF: 10 pages
Proc. SPIE 2827, Digital Image Recovery and Synthesis III, (25 October 1996); doi: 10.1117/12.255074
Show Author Affiliations
Laura J. Ulibarri, Rockwell Power Systems (United States)
James K. Boger, Rockwell Power Systems (United States)
Matthew P. Fetrow, Applied Technology Associates, Inc. (United States)

Published in SPIE Proceedings Vol. 2827:
Digital Image Recovery and Synthesis III
Paul S. Idell; Timothy J. Schulz, Editor(s)

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