Hollow Core Bragg Fiber Integrated With Regenerate Fiber Bragg Grating for Simultaneous High Temperature and gas Pressure Sensing

• DOI: 10.1109/jlt.2021.3088530
• Publication Date: 2021-06-11T19:46:37Z
• Authors: Yu Wang; Jihong Tao; Weihao Yuan; Zhenggang Lian; Qiang Ling; Daru Chen; Zhangwei Yu; Chao Lu
• Keywords: Fiber Bragg Grating; PHOSFOS; Waveguide; Pressure measurement

We have proposed and experimentally demonstrated a novel optical fiber sensor for simultaneous measurement of high temperature gas pressure based on Regenerated Fiber Bragg grating (RFBG) cascaded with homemade hollow core (HCBF). The HCBF functions as an anti-resonant reflecting waveguide acts sensing unit. sample was fabricated tested in our lab, exhibiting linear sensitivity −3.747 nm/MPa 25.925 pm/°C large-dynamic range 2 MPa 600 °C, respectively. RFBG, monitor, integrated to compensate the cross-correspondence HCBF. By utilizing × matrix obtained experimental results, can be achieved. Besides, compact size, low cost make more competitive harsh environment application.