27 April 2019 Fiber-optic sensor implanted with seven-core helical structure for measurement of tensile strain and extrusion bending
Xiangyu Wang, Xueguang Qiao, Dakuan Yu, Hong Gao, Wei Fan
Author Affiliations +
Abstract
We proposed a fiber-optic sensor implanted with helical seven-core structure based on Mach–Zehnder interference, which can be used for the measurement of tensile strain and extrusion bending. The sensor consisted of a section of seven-core optical fiber with helical structure, which can be described as the SMF-Taper-HSCF-Taper-SMF (HSCF, helical seven-core fiber) sensor. When stretching or bending is applied, the sensor will undergo certain deformation, which will lead to the changes of interference modes in the optical fiber. The tensile strain and extrusion bending can be measured accurately according to the response of transmission spectrum to mode change. The helical seven-core structure can effectively stimulate higher order modes and induced deformation changes. In the experiment, three sensors with different helical periods were fabricated and their spectral characteristics were analyzed. Finally, we selected the sensor with a helical period of 190  μm to conduct a strain and bending test. The results show that the strain sensitivity of the sensor is −21.31  pm  /  με in the range of 0 to 500  με, and the curvature sensitivity of the sensor is −6.36  nm  /  m  −  1 in the range of 0.16 to 1.6  m  −  1. This sensor can detect strain and bending and has stable sensing performance and high sensitivity.
© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2019/$25.00 © 2019 SPIE
Xiangyu Wang, Xueguang Qiao, Dakuan Yu, Hong Gao, and Wei Fan "Fiber-optic sensor implanted with seven-core helical structure for measurement of tensile strain and extrusion bending," Optical Engineering 58(4), 046111 (27 April 2019). https://doi.org/10.1117/1.OE.58.4.046111
Received: 7 December 2018; Accepted: 21 March 2019; Published: 27 April 2019
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CITATIONS
Cited by 3 scholarly publications.
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KEYWORDS
Sensors

Fiber optics sensors

Optical fibers

Single mode fibers

Structured optical fibers

Interferometers

Optical engineering

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