In this paper, a dual-parameter measurement scheme based on a fiber loop mirror (FLM) assisted reflective long period fiber grating (LPFG) is proposed and experimentally demonstrated. Due to the Sagnac fiber loop mirror, a reflective long period fiber grating was generated resulting in a compact sensing routing design. Moreover, the refractive index and temperature could be simultaneously determined through monitoring two dips’ wavelength shifts of the FLM assisted reflective LPFG. Experimental results show that the RI sensitivity of the sensor is from 34.48nm/RIU to 241.12nm/RIU in the RI range from 1.3467 to 1.4526, and the temperature sensitivity can reach 1.5274 nm / °C.
In this work, we present an optical fiber sensor system for remote refractive index measurement using the optical time
domain reflectometry technique as an interrogation method, and investigate the refractive index sensibility of the sensor
system in detail. The sensor system operates based on Fresnel reflection at the fiber’s end that is cleaved as a vertical
planar surface. Surrounding refractive index from a long distance away can be measured easily through utilizing this
sensor system. The experimental setup is simple and easy to handle. Experimental results show the feasibility of the
remote measurement of refractive index. The range of this measurement can reach ~30km, moreover, to ensure its
repeatability and accuracy, we retest the same sample for many times, some of which are artificially applied with
disturbance. Lastly we make a comparative analysis to certify that the sensor system has a good potential to remote
practical applications.
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