Laboratory investigation of aberration recovery for Doppler heterodyne

Laura J. Ulibarri; James K. Boger; Matthew P. Fetrow

doi:10.1117/12.255074

25 October 1996 Laboratory investigation of aberration recovery for Doppler heterodyne

Laura J. Ulibarri, James K. Boger, Matthew P. Fetrow

Proceedings Volume 2827, Digital Image Recovery and Synthesis III; (1996) https://doi.org/10.1117/12.255074
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

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.

Citation Download Citation

Laura J. Ulibarri, James K. Boger, and Matthew P. Fetrow "Laboratory investigation of aberration recovery for Doppler heterodyne", Proc. SPIE 2827, Digital Image Recovery and Synthesis III, (25 October 1996); https://doi.org/10.1117/12.255074

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