Combined strain and temperature measurements using optical fibers

W. Craig Michie; Brian Culshaw; Maria Konstantaki; Graham Thursby

doi:10.1117/12.221709

25 September 1995 Combined strain and temperature measurements using optical fibers

W. Craig Michie, Brian Culshaw, Maria Konstantaki, Graham Thursby

Proceedings Volume 2510, Fiber Optic and Laser Sensors XIII; (1995) https://doi.org/10.1117/12.221709
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

Abstract

The simple observation that the temperature coefficient of most structural materials in which strain may need to be measured differs from that of optical fiber measuring systems indicates immediately that both temperature and strain fields should be mapped with comparable accuracy in order to arrive at a reliable indication of mechanical strain. This paper initially defines the criteria for adequate compatibility between temperature and strain field measuement and then compares the techniques which have emerged in the past five years to address this problem. All techniques require the measurement of two optical parameters which are typically differential delays e.g. in interferometers and grating sensors or combined dellay and dispersion characteristics. The basic features of these measurement techniques will be addressed and comparisons made between the applicability of the various techniques. As an example, our own work measured temperature and strain to within +/- 2 C and 10 (mu) (epsilon) . Other work, e.g. with Bragg gratings achieves +/- a few tens of (mu) (epsilon) and a few degrees centrigrade.

Citation Download Citation

W. Craig Michie, Brian Culshaw, Maria Konstantaki, and Graham Thursby "Combined strain and temperature measurements using optical fibers", Proc. SPIE 2510, Fiber Optic and Laser Sensors XIII, (25 September 1995); https://doi.org/10.1117/12.221709

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