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Practical fiber-optic Bragg grating strain gauge system

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Abstract

A fiber-optic strain gauge system for use in structural monitoring and smart-structure applications is described. The strain gauge uses a fiber-optic Bragg grating sensor to measure strain and a passive, wavelength demodulation system to determine the wavelength of the narrow-band, backreflected spectrum from the grating sensor. The fiber-optic strain gauge system permits the measurement of both static and dynamic strains with a noise-limited resolution of 0.44microstrain/Hz, a measurement dynamic range of 27.8 dB, and a bandwidth of 250 Hz.

© 1993 Optical Society of America

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