Using an in-fiber Bragg-grating sensor for measurement of thermal expansion coefficient in structures

Yu-Lung Lo

doi:10.1117/12.2302060

1 September 1999 Using an in-fiber Bragg-grating sensor for measurement of thermal expansion coefficient in structures

Yu-Lung Lo

Proceedings Volume 3746, 13th International Conference on Optical Fiber Sensors; 37461Y (1999) https://doi.org/10.1117/12.2302060
Event: 13th International Conference on Optical Fiber Sensors, 1999, Kyongju, Korea, Republic of

Abstract

A simple method to measure the thermal expansion coefficient using a surface mounted Bragg grating sensor is presented. This method uses a single, uniform pitch Bragg grating fiber with preloading that is only partially glued on the specimen. After release, two Bragg wavelengths are observed. The Bragg wavelength reflected from the sensor section not glued to the specimen is used to measure temperature variations; and the Bragg wavelength reflected from the sensor section glued to the specimen is affected by thermal strain variations. Therefore, the thermal expansion coefficient can be determined by calculating the difference of the spectral separation between two Bragg wavelengths.

Citation Download Citation

Yu-Lung Lo "Using an in-fiber Bragg-grating sensor for measurement of thermal expansion coefficient in structures", Proc. SPIE 3746, 13th International Conference on Optical Fiber Sensors, 37461Y (1 September 1999); https://doi.org/10.1117/12.2302060

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