Title :
Mach–Zehnder Interferometer Based on a Sandwich Fiber Structure for Refractive Index Measurement
Author :
Ma, Yue ; Qiao, Xueguang ; Guo, Tuan ; Wang, Ruohui ; Zhang, Jing ; Weng, Yinyan ; Rong, Qiangzhou ; Hu, Manli ; Feng, Zhongyao
Author_Institution :
Dept. of Phys., Northwest Univ., Xi´´an, China
fDate :
6/1/2012 12:00:00 AM
Abstract :
A novel refractive-index (RI) sensor based on Mach-Zehnder interferometer composed of an uncoated single-mode fiber section sandwiched between two short sections of multimode fiber is proposed and experimentally demonstrated. A clear interference spectrum is obtained and the dip wavelength shifts as a function of surrounding RI. An estimated resolution of 7.1 × 10-5 within the linear sensing range from 1.33 to 1.40 and a maximum up to 6.4 × 10-6 at indexes around 1.44 have been achieved for the cost-effective RI measurement.
Keywords :
Mach-Zehnder interferometers; fibre optic sensors; refractive index measurement; Mach-Zehnder interferometer; interference spectrum; refractive index measurement; sandwich fiber structure; uncoated single mode fiber section; Indexes; Interference; Optical fiber sensors; Refractive index; Sensitivity; Fiber-optic sensor; Mach–Zehnder interferometer; refractive-index measurement; sandwich fiber structure;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2012.2184751
