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Proceedings Paper

Four-element fiber grating sensor array with phase-sensitive detection
Author(s): R. Stephen Weis; Alan D. Kersey; Timothy A. Berkoff
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Paper Abstract

A four element, time-division multiplexed, fiber grating sensor array operating between the wavelengths of 1280 and 1310 nm was constructed and tested. The array consists of a 1300 nm edge-emitting LED which illuminates four gratings spaced five meters apart. Each grating in the array reflects a spectrally narrow-band (0.2 - 0.5 nm) wavelength region. Measurand- induced changes in the grating period change the wavelength of the light reflected by each grating. The wavelength shifts are converted to phase changes by routing the reflected signal through a nearly path balanced fiber Mach Zehnder interferometer. The minimum detectable strain was measured to be as low as 2 nanostrain/(root)Hz for the frequencies between 10 and 100 Hz.

Paper Details

Date Published: 1 May 1994
PDF: 8 pages
Proc. SPIE 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation, (1 May 1994); doi: 10.1117/12.173941
Show Author Affiliations
R. Stephen Weis, Texas Christian Univ. (United States)
Alan D. Kersey, Naval Research Lab. (United States)
Timothy A. Berkoff, SFA, Inc. (United States)

Published in SPIE Proceedings Vol. 2191:
Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation
James S. Sirkis, Editor(s)

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