A hybrid Raman/EFPI/FBG sensing system for distributed temperature and key-point pressure measurements

Ke Chen; Xinlei Zhou; Yang Yang; Qingxu Yu

doi:10.1117/12.2190244

10 August 2015 A hybrid Raman/EFPI/FBG sensing system for distributed temperature and key-point pressure measurements

Ke Chen, Xinlei Zhou, Yang Yang, Qingxu Yu

Proceedings Volume 9620, 2015 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 96200R (2015) https://doi.org/10.1117/12.2190244
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

Abstract

We demonstrate a hybrid sensing scheme, combining the incoherent optical frequency domain reflectometry (IOFDR) based Raman distributed temperature sensor (DTS) with the extrinsic Fabry-Perot interferometer (EFPI) based pressure sensor, for down-hole monitoring. The pressure measurement is compensated by a fiber Bragg grating (FBG) based temperature sensor. By using a laser diode as the common light source, a hybrid Raman/EFPI/FBG sensing system has been developed with a single fiber. The stimulated emission light and the spontaneous emission light of the laser diode are used for DTS and EFPI-FBG interrogations respectively. There can be no overlap between the spectral range of the Raman backscattered light and the spectral range of the reflected light from the EFPI-FBG sensor. Distributed temperature and pressure can thus be measured by using wavelength-division multiplexing (WDM) technology. Experimental results show that, both the distributed temperature and the key-point pressure can be measured alternatively with little interference.

Citation Download Citation

Ke Chen, Xinlei Zhou, Yang Yang, and Qingxu Yu "A hybrid Raman/EFPI/FBG sensing system for distributed temperature and key-point pressure measurements", Proc. SPIE 9620, 2015 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 96200R (10 August 2015); https://doi.org/10.1117/12.2190244

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