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- W2101031026 abstract "A temperature-independent fiber-Bragg-grating strain-sensing system, based on a novel optical-power-detection scheme, is developed and analyzed. In this system a pair of fiber Bragg gratings with reflection spectra either partially or substantially overlapping is placed side by side to form a temperature-independent strain-sensor unit. Conventional wavelength-interrogation techniques are not used here, and instead an optical-power-detection scheme is proposed to directly calibrate the measurand, i.e., the strain. Unlike the conventional approach in a multiplexed sensing system, the presented power-detection-based interrogation method does not need the fiber-Bragg-grating sensors to be spectrally separate. The only requirement is that the spectra of the two fiber Bragg gratings of each sensor unit in a multiplexed system be identical or slightly separate (slightly overlapping spectra would also work in the sensing scheme) and the source’s optical power be sufficient for sensitive measurement. Based on a three-sensor-unit system, we demonstrate simple strain measurements of high linearity (±0.4%), good sensitivity [2 microstrains (µS)], high thermal stability (±0.8%), and zero cross talk. The effects of light source spectral flatness and fiber bending loss on measurement accuracy are also discussed." @default.
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- W2101031026 date "2002-03-20" @default.
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- W2101031026 title "Multipoint temperature-independent fiber-Bragg-grating strain-sensing system employing an optical-power-detection scheme" @default.
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- W2101031026 doi "https://doi.org/10.1364/ao.41.001661" @default.
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