10 November 2003 Simultaneous temperature and strain sensing for cryogenic applications using dual-wavelength fiber Bragg gratings
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Abstract
A new technique has been developed for sensing both temperature and strain simultaneously by using dual-wavelength fiber-optic Bragg gratings. Two Bragg gratings with different wavelengths were inscribed at the same location in an optical fiber to form a sensor. By measuring the wavelength shifts that resulted from the fiber being subjected to different temperatures and strains, the wavelength-dependent thermo-optic coefficients and photoelastic coefficients of the fiber were determined. This enables the simultaneous measurement of temperature and strain. In this study, measurements were made over the temperature range from room temperature down to about 10 K, addressing much of the low temperature range of cryogenic tanks. A structural transition of the optical fiber was found when the temperature decreased. This transition caused splitting of the waveforms characterizing the Bragg gratings, and the determination of wavelength shifts was consequently complicated. The effectiveness and sensitivities of these measurements in different temperature ranges are also discussed.
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Meng-Chou Wu, Meng-Chou Wu, William H. Prosser, William H. Prosser, "Simultaneous temperature and strain sensing for cryogenic applications using dual-wavelength fiber Bragg gratings", Proc. SPIE 5191, Optical Diagnostics for Fluids, Solids, and Combustion II, (10 November 2003); doi: 10.1117/12.510046; https://doi.org/10.1117/12.510046
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