Chinese Optics Letters, 2016, 14 (5): 050601, Published Online: Aug. 6, 2018
Fiber in-line Fabry–Pérot interferometer for simultaneous measurement of reflective index and temperature
Abstract
A fiber in-line Fabry–Pérot interferometer is presented. The sensing head consists of a micro ellipsoidal air cavity and a small section of solid-core photonic crystal fiber. The reflective index (RI) and temperature can be interrogated simultaneously through a fast Fourier transform and by tracing the dip wavelength shift of the reflective spectrum. Experimental results show that the RI amplitude and wavelength sensitivities are 5.30/RIU and 8.46 × 10 1 nm / RIU in the range from 1.34 to 1.43, and the temperature amplitude and wavelength sensitivities are 6.8 × 10 4 / ° C and 2.48 × 10 3 nm / ° C in the range from 15°C to 75°C, respectively. Easy fabrication, a simple system, and simultaneous measurement make it appropriate for dual-parameter sensing application.
Xiaoqi Ni, Ming Wang, Dongmei Guo. Fiber in-line Fabry–Pérot interferometer for simultaneous measurement of reflective index and temperature[J]. Chinese Optics Letters, 2016, 14(5): 050601.