Title :
Detection of Liquid Level With an MI-Based Fiber Laser Sensor Using Few-Mode EMCF
Author :
Xiao Liang ; Zhibo Liu ; Huai Wei ; Yang Li ; Shuisheng Jian
Author_Institution :
Key Lab. of All Opt. Network & Adv. Telecommun. Network of EMC, Beijing Jiaotong Univ., Beijing, China
Abstract :
This letter firstly and experimentally demonstrated a fiber laser sensing system using Michelson interferometer (MI) based on few-mode elliptical multilayer-core fibers (EMCFs) for liquid level and refractive index (RI) measurement. The fiber sensing system has high optical signal-to-noise ratio (~45 dB) and narrow 3-dB bandwidth (<;0.1 nm). Four water-glycerin solutions of different RI are used for this experiment, and the higher sensitivity is acquired for the higher RI liquid. The sensitivities for the liquids with indices of 1.333, 1.353, 1.373, and 1.393 are 30.5, 35.6, 41.1, and 50.6 pm/mm within a depth range of 0-45 mm, respectively. Moreover, the RI of liquid can also be measured, and a sensitivity of 329.222 pm/mm/RIU is experimentally achieved.
Keywords :
Michelson interferometers; fibre lasers; fibre optic sensors; level measurement; measurement by laser beam; optical multilayers; organic compounds; refractive index measurement; water; MI-based fiber laser sensor; Michelson interferometer; RI liquid; depth 0 mm to 45 mm; few-mode EMCF; few-mode elliptical multilayer-core fibers; fiber laser sensing system; fiber sensing system; liquid level detection; optical signal-to-noise ratio; refractive index measurement; water-glycerin solutions; Fiber lasers; Liquids; Measurement by laser beam; Optical fiber polarization; Optical fiber sensors; Fiber laser sensor; Michelson interferometer; elliptical multilayer-core fiber; few-mode fiber; fiber laser sensor; liquid level;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2389857
