Abstract

We present a new method for the interrogation of large arrays of Bragg grating sensors. Eight gratings operating between the wavelengths of 1533 and 1555 nm have been demultiplexed. An unbalanced Mach– Zehnder interferometer illuminated by a single low-coherence source provides a high-phase-resolution output for each sensor, the outputs of which are sequentially selected in wavelength by a tunable Fabry–Perot interferometer. The minimum detectable strain measured was $90\hspace{0.17em}\text{n}\varepsilon /\sqrt{\text{Hz}}$at 7 Hz for a wavelength of 1535 nm.

© 1995 Optical Society of America

Simultaneous interrogation of interferometric and Bragg grating sensors

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Combined spatial- and time-division-multiplexing scheme for fiber grating sensors with drift-compensated phase-sensitive detection

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Strain sensing of modern composite materials with a spatial/wavelength-division multiplexed fiber grating network

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Fiber-optic Fabry-Perot sensors based on a combination of spatial-frequency division multiplexing and wavelength division multiplexing formed by chirped fiber Bragg grating pairs

Y. J. Rao, Z. L. Ran, and C. X. Zhou
Appl. Opt. 45(23) 5815-5818 (2006)

Time-and-spatial-multiplexing tree topology for fiber-optic Bragg-grating sensors with interferometric wavelength-shift detection

A. B. Lobo Ribeiro, Y. J. Rao, L. Zhang, I. Bennion, and D. A. Jackson
Appl. Opt. 35(13) 2267-2273 (1996)