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Proceedings Paper

Two-mode fiber optic strain sensor system for smart structures and skins
Author(s): Zhuo Jun Lu; Franz A. Blaha
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Paper Abstract

A strain sensor system for smart structures and skins has been developed. The sensor system uses a two-mode elliptical core fiber sensor and two diode lasers, operating at nominal wavelengths of 750 nm and 780 nm, respectively. The lasers are frequency-modulated such that periodic mode hopping is induced. Data is sampled for each laser mode. A least-absolute-deviation method has been devised for calculating the sensor phases at both wavelengths. The ambiguity arising from the periodicity of the interferometer response is resolved by comparing all possible optical path differences corresponding to the sensor phases at the two wavelengths. The system is able to measure 0.01 of a fringe over a range of ten fringes.

Paper Details

Date Published: 1 December 1990
PDF: 9 pages
Proc. SPIE 1370, Fiber Optic Smart Structures and Skins III, (1 December 1990); doi: 10.1117/12.24842
Show Author Affiliations
Zhuo Jun Lu, Canadian Marconi Co. (Canada)
Franz A. Blaha, Canadian Marconi Co. (Canada)

Published in SPIE Proceedings Vol. 1370:
Fiber Optic Smart Structures and Skins III
Richard O. Claus; Eric Udd, Editor(s)

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