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Proceedings Paper

Laser Doppler Velocimeter With Multi-Function Integrated Optic Circuit
Author(s): P. G. Suchoski; J. P. Waters; M. R. Fernald
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Paper Abstract

A miniature fiber-optic Laser Doppler Velocimeter (LDV) is demonstrated which uses a proton-exchanged LiNb03 multi-function integrated optic circuit for signal processing. The system utilizes a high-power (7.5 mW out of the fiber pigtail) 0.8- micron laser diode with short coherence length (approximately 1 cm) as the source and coherence multiplexing techniques to provide a phase-insensitive fiber-optic probe for monitoring moving or vibrating parts. The fiber-optic LDV provides 55 dB signal-to-noise ratio for 3 kHz bandwidth, even when monitoring parts with poor optical surfaces (1 % reflectivity). Operation of the system is demonstrated by monitoring a mirror vibrating at 5.7 kHz with 36.8 nm peak-to-peak deviation. The optical components and all electronic circuitry except for the DC power supply is housed in a 11.5 x 10.5 x 4.2 cm package which weighs 0.6 kg. The entire system operates on a ± 15 V, 300 mA supply. The small size, light weight, low power requirements, and phase-insensitive fiber-optic probe make the fiber-optic LDV appealing for a number of industrial and medical applications.

Paper Details

Date Published: 5 January 1990
PDF: 11 pages
Proc. SPIE 1177, Integrated Optics and Optoelectronics, (5 January 1990); doi: 10.1117/12.963314
Show Author Affiliations
P. G. Suchoski, United Technologies Research Center (United States)
J. P. Waters, United Technologies Research Center (United States)
M. R. Fernald, United Technologies Research Center (United States)


Published in SPIE Proceedings Vol. 1177:
Integrated Optics and Optoelectronics
Leon McCaughan; Mark A. Mentzer; Song-Tsuen Peng; Henry J. Wojtunik; Ka Kha Wong, Editor(s)

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