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Optical Engineering

Multichannel optical spectrum analyzer for laser Doppler signals, using a liquid crystal spatial light modulator
Author(s): Tomoaki Eiju; Thomas H. Barnes; Kiyofumi Matsuda; Shigeru Kokaji
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Paper Abstract

A novel optical signal processor has been developed for analyzing laser Doppler velocimeter output signals. Optical Fourier transform techniques are used to determine the spectrum of the laser Doppler signals, with a liquid crystal spatial light modulator used as the input device to the optical system. The optical Fourier transform is one dimensional, performed by an anamorphic lens system that performs a Fourier transform in the horizontal direction of the input plane while imaging in the vertical direction. The system is therefore capable of simultaneously analyzing multiple laser Doppler input signals. The capabilities of the system are demonstrated using both synthetic computer-generated input signals and "real" input data obtained from a laser Doppler velocimeter.

Paper Details

Date Published: 1 January 1993
PDF: 5 pages
Opt. Eng. 32(1) doi: 10.1117/12.60065
Published in: Optical Engineering Volume 32, Issue 1
Show Author Affiliations
Tomoaki Eiju, Mechanical Engineering Lab. (Japan)
Thomas H. Barnes, Univ. of Auckland (New Zealand)
Kiyofumi Matsuda, Mechanical Engineering Lab. (Japan)
Shigeru Kokaji, Mechanical Engineering Lab. (Japan)

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