The response of high-temperature optical fiber sensor applied to different materials

Chong Du; Weihua Xie; Shiyu Huo; Songhe Meng; Kai Xu; Lichuang Jiao

doi:10.1117/12.2028309

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9 August 2013 The response of high-temperature optical fiber sensor applied to different materials

Chong Du, Weihua Xie, Shiyu Huo, Songhe Meng, Kai Xu, Lichuang Jiao

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Proceedings Volume 8793, Fourth International Conference on Smart Materials and Nanotechnology in Engineering; 87930O (2013) https://doi.org/10.1117/12.2028309
Event: Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 2013, Gold Coast, Australia

Abstract

This paper mainly studies the response of high-temperature optical fiber sensor applied to different hot structural materials. Strain and temperature sensitivities of the optical fiber are discussed. The heat test on the bare FBG shows that wavelength and temperature are not of a simple linear relationship, and that using a quadratic function description is more reasonable at high temperature. A type of silica optical fiber sensor is attached to different structures using a special high-temperature adhesive. Two kinds of high-temperature materials, high-temperature alloy and ultra-high temperature ceramic, are used as the base materials. Experiments are carried out to break through the connection technology at high temperature. The response of temperature and strain are measured simultaneously from room temperature to maximum 750°C. The response differences are compared by using the signal decoupling method. The relationship between wavelength change and structural thermal strain is studied; the first-order and the second-order temperature sensitivities coefficients are given for different materials. Through the experiment, the different strain transfer coefficients are given in the two cases. This study realized the concurrent monitoring of structural temperature and strain at high-temperature situation using only one sensor, and thus provides a new way for hot structure health monitoring in high-temperature environment.

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Chong Du, Weihua Xie, Shiyu Huo, Songhe Meng, Kai Xu, and Lichuang Jiao "The response of high-temperature optical fiber sensor applied to different materials", Proc. SPIE 8793, Fourth International Conference on Smart Materials and Nanotechnology in Engineering, 87930O (9 August 2013); https://doi.org/10.1117/12.2028309

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