Title :
High Sensitive Micro-Displacement Sensor Based on M-Z Interferometer by a Bowknot Type Taper
Author :
Chang-Yu Shen ; Jin-Lei Chu ; Yan-Fang Lu ; De-Bao Chen ; Chuan Zhong ; Yi Li ; Xin-Yong Dong ; Shang-Zhong Jin
Author_Institution :
Inst. of Optoelectron. Technol., China Jiliang Univ., Hangzhou, China
Abstract :
A simple, compact, and high sensitive optical fiber Mach-Zehnder interferometer (MZI) based micro-displacement sensor is presented. The MZI is fabricated by a core offset connecting of two single mode fibers and bowknot-type taper. The shifts of the MZI transmission spectrum correspond to the micro-displacements on the cross section of the core offset. For the micro-displacement ranging from 0 to 13 μm, the proposed sensor shows a high sensitivity of -1.89 dB/μm, which is almost 787 times higher than that of the current similar existing micro-displacement sensor. In addition by using the intensity demodulation method, the proposed sensor can overcome the temperature and displacement cross-sensitivity effects.
Keywords :
Mach-Zehnder interferometers; displacement measurement; fibre optic sensors; infrared spectra; intensity modulation; micro-optics; microsensors; optical fibre fabrication; optical modulation; MZI; MZI transmission spectrum; bowknot-type taper; core offset; displacement cross-sensitivity effects; intensity demodulation method; simple compact high sensitive optical fiber Mach-Zehnder interferometer based microdisplacement sensor; single mode fibers; temperature cross-sensitivity effects; Interference; Optical fiber polarization; Optical fiber sensors; Optical interferometry; Sensitivity; Temperature measurement; Temperature sensors; Mach–Zehnder interferometer; Micro-displacement; bowknot-type taper;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2289320
