Release Time:2019-03-11  Hits:

Indexed by: Conference Paper

Date of Publication: 2015-05-17

Included Journals: Scopus、SCIE、CPCI-S、EI

Volume: 9620

Key Words: Distributed temperature sensor; Fabry-Perot interferometer; fiber Bragg grating; incoherent optical frequency domain reflectometry; down-hole measurement

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.