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Sensors 2017, 17(5), 1005;

High Precision Temperature Insensitive Strain Sensor Based on Fiber-Optic Delay

School of OptoElectronic information, University of Electronic Science and Technology of China, Chengdu 610054, China
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 8 March 2017 / Revised: 20 April 2017 / Accepted: 28 April 2017 / Published: 2 May 2017
(This article belongs to the Section Physical Sensors)
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A fiber-optic delay based strain sensor with high precision and temperature insensitivity was reported, which works on detecting the delay induced by strain instead of spectrum. In order to analyze the working principle of this sensor, the elastic property of fiber-optic delay was theoretically researched and the elastic coefficient was measured as 3.78 ps/km·με. In this sensor, an extra reference path was introduced to simplify the measurement of delay and resist the cross-effect of environmental temperature. Utilizing an optical fiber stretcher driven by piezoelectric ceramics, the performance of this strain sensor was tested. The experimental results demonstrate that temperature fluctuations contribute little to the strain error and that the calculated strain sensitivity is as high as 4.75 με in the range of 350 με. As a result, this strain sensor is proved to be feasible and practical, which is appropriate for strain measurement in a simple and economical way. Furthermore, on basis of this sensor, the quasi-distributed measurement could be also easily realized by wavelength division multiplexing and wavelength addressing for long-distance structure health and security monitoring. View Full-Text
Keywords: fiber-optic delay; strain sensor; temperature insensitive; elastic coefficient fiber-optic delay; strain sensor; temperature insensitive; elastic coefficient

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Yang, N.; Su, J.; Fan, Z.; Qiu, Q. High Precision Temperature Insensitive Strain Sensor Based on Fiber-Optic Delay. Sensors 2017, 17, 1005.

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