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

Volume

26

Issue

1

fYear

2014

fDate

Jan.1, 2014

Firstpage

62

Lastpage

65

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;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2289320

Filename

6656895