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Sensors 2017, 17(12), 2908; doi:10.3390/s17122908

Fiber-Optic Sensor-Based Remote Acoustic Emission Measurement in a 1000 °C Environment

Institute of Industrial Science, University of Tokyo, Tokyo 153-8505, Japan
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Received: 11 October 2017 / Revised: 27 November 2017 / Accepted: 12 December 2017 / Published: 14 December 2017
(This article belongs to the Special Issue Optical Fiber Sensors 2017)
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Abstract

Recently, the authors have proposed a remote acoustic emission (AE) measurement configuration using a sensitive fiber-optic Bragg grating (FBG) sensor. In the configuration, the FBG sensor was remotely bonded on a plate, and an optical fiber was used as the waveguide to propagate AE waves from the adhesive point to the sensor. The previous work (Yu et al., Smart Materials and Structures 25 (10), 105,033 (2016)) has clarified the sensing principle behind the special remote measurement system that enables accurate remote sensing of AE signals. Since the silica-glass optical fibers have a high heat-resistance exceeding 1000 °C, this work presents a preliminary high-temperature AE detection method by using the optical fiber-based ultrasonic waveguide to propagate the AE from a high-temperature environment to a room-temperature environment, in which the FBG sensor could function as the receiver of the guided wave. As a result, the novel measurement configuration successfully achieved highly sensitive and stable AE detection in an alumina plate at elevated temperatures in the 100 °C to 1000 °C range. Due to its good performance, this detection method will be potentially useful for the non-destructive testing that can be performed in high-temperature environments to evaluate the microscopic damage in heat-resistant materials. View Full-Text
Keywords: fiber-optic Bragg grating; high temperature; acoustic emission; guided wave; non-destructive test fiber-optic Bragg grating; high temperature; acoustic emission; guided wave; non-destructive test
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yu, F.; Okabe, Y. Fiber-Optic Sensor-Based Remote Acoustic Emission Measurement in a 1000 °C Environment. Sensors 2017, 17, 2908.

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