High-Sensitivity Displacement Sensor Based on a Bent Fiber Mach-Zehnder Interferometer

A simple, low-cost, and high-sensitivity optical fiber displacement sensor is presented and fabricated by concatenating two core-offset joints (COJs) with a separation length of 13 mm using a commercial fusion splicer. The two COJs construct an in-line Mach-Zehnder interferometer (MZI). When the MZI...

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Bibliographic Details
Published inIEEE photonics technology letters Vol. 25; no. 23; pp. 2354 - 2357
Main Authors Chen, Jinping, Zhou, Jun, Jia, Zhenhong
Format Journal Article
LanguageEnglish
Published IEEE 01.12.2013
Subjects
Displacement measurement
Interference
Optical fiber sensors
Optical fibers
Optimized production technology
Robot sensing systems
Sensitivity
Temperature measurement
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Summary:A simple, low-cost, and high-sensitivity optical fiber displacement sensor is presented and fabricated by concatenating two core-offset joints (COJs) with a separation length of 13 mm using a commercial fusion splicer. The two COJs construct an in-line Mach-Zehnder interferometer (MZI). When the MZI is bent to have a bending radius of ~ 17 mm, the interference pattern of the MZI depends strongly on the bending radius. According to this character, we scheme the bent MZI as a displacement sensor in two ways providing two different bending types of the bent MZI. The displacement sensitivities obtained are up to 0.835 and 0.227 nm/μm in the large displacement variation ranges of 350 and 1000 μm, respectively.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2013.2285160