30 October 2001 Temperature-strain discrimination using a wavelength-division-multiplexed chirped FBG/EFPI sensor system
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Proceedings Volume 4596, Advanced Photonic Sensors and Applications II; (2001) https://doi.org/10.1117/12.447330
Event: International Symposium on Photonics and Applications, 2001, Singapore, Singapore
Abstract
A novel fibre-optic sensing system used for temperature- strain discrimination is presented. This system consists of an extrinsic Fabry-Perot interferometric sensor (EFPI) and a chirped in-fibre Bragg grating (CFBG) in series. The EFPI and the CFBG are wavelength-division multiplexed to provide strain and temperature information, respectively. The wavelength-shift of the CFBG induced by temperature change at the 1.55μm region is interrogated with an intensity- based scheme, allowing fast measurement of temperature. The cavity length change of the EFPI is measured at the 1.3μm region, allowing strain to be measured without cross-talk from the temperature sensor, i.e, the CFBG. Experimental results show that the achieved accuracies for strain and temperature measurement are ±20με and ±2°C, respectively.
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Yun-Jiang Rao, Xiang Kai Zeng, Yi-Ping Wang, Tao Zhu, Zeng-Lin Ran, Lin Zhang, Ian Bennion, "Temperature-strain discrimination using a wavelength-division-multiplexed chirped FBG/EFPI sensor system", Proc. SPIE 4596, Advanced Photonic Sensors and Applications II, (30 October 2001); doi: 10.1117/12.447330; https://doi.org/10.1117/12.447330
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