Thermally regenerated fiber Bragg gratings in twin-air-hole microstructured fibers for high temperature pressure sensing

Abstract

We present thermally regnenerated fiber Bragg grating in air-hole microstructured fibers for high temperature hydrostatic pressure sensing application. Saturated type I gratings were inscribed in hydrogen-loaded two-hole optical fibers using 248-nm KrF laser, and regenerated during annealing at 800ºC. The fiber Bragg grating resonance wavelength shift and peak splits were studied as a function of external hydrostatic pressure from 15 psi to 2400 psi. The grating pressure sensor shows stable and reproducible operation up to 800ºC. This paper demonstrates a multiplexible pressure sensor network technology for high temperature harsh environment using a single fiber feedthrough. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/24/2015 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 8028 802807-4 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/24/2015 Terms of Use: http://spiedl.org/terms Proc. of SPIE Vol. 8028 802807-7 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/24/2015 Terms of Use: http://spiedl.org/terms

Fiber Bragg Grating Sensors for the Oil Industry

“…For these high-temperature circumstances, FBG sensors are able to provide precise and reliable gas pressure detections for safe industrial operations. Since microstructure fibers possess unique geometry and optical properties, air-hole microstructured fiber based FBG sensors have been good candidates for high-temperature pressure measurement [166,167,168,169]. When the external pressure is applied on the fiber hole, these air holes deform accordingly.…”