Four-element fiber grating sensor array with phase-sensitive detection

R. Stephen Weis; Alan D. Kersey; Timothy A. Berkoff

doi:10.1117/12.173941

1 May 1994 Four-element fiber grating sensor array with phase-sensitive detection

R. Stephen Weis, Alan D. Kersey, Timothy A. Berkoff

Author Affiliations +

Proceedings Volume 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation; (1994) https://doi.org/10.1117/12.173941
Event: 1994 North American Conference on Smart Structures and Materials, 1994, Orlando, FL, United States

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.

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R. Stephen Weis, Alan D. Kersey, and Timothy A. Berkoff "Four-element fiber grating sensor array with phase-sensitive detection", Proc. SPIE 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation, (1 May 1994); https://doi.org/10.1117/12.173941

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