Abstract

We report the interrogation of a fiber Bragg grating (FBG) using an interferometer with a tilted mirror such that the optical path difference is a function of position on an array detector. Absolute measurements of mean resonant wavelength from the phase of the analytic signal of the spatial interferogram are determined, and a technique based on using a reference laser to compensate for performance degrading effects otherwise associated with spatially scanned interferometers is introduced. These measurements are not critically dependent on the accurate location of zero phase position. We have applied the technique to the absolute measurement of temperature-induced shifts in the grating resonant wavelength. A resolution of 0.025 nm for a spatially scanned optical path delay of only 200 m was achieved. The technique has the potential for higher resolutions and for multiplexing.

[IEEE ]

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Appl. Opt. (1)

J. Lightwave Technol. (3)

G. A. Ball, W. W. Morey and P. K. Cheo, "Fiber laser source/analyzer for Bragg grating sensor array interrogation", J. Lightwave Technol., vol. 12, pp. 700-703, Apr. 1994.

M. A. Davis and A. D. Kersey, "Application of a fiber Fourier transform spectrometer to the detection of wavelength-encoded signals from Bragg grating sensors", J. Lightwave Technol., vol. 13, pp. 1289-1295, July 1995.

K. B. Rochford and S. D. Dyer, "Demultiplexing of interferometrically interrogated fiber Bragg grating sensors using Hilbert transform processing", J. Lightwave Technol., vol. 17, pp. 831-836, May 1999.

Opt. Lett. (4)

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