High precision, high sensitivity distributed displacement and temperature measurements using OFDR-based phase tracking

Dawn K. Gifford; Mark E. Froggatt; Stephen T. Kreger

doi:10.1117/12.885131

17 May 2011 High precision, high sensitivity distributed displacement and temperature measurements using OFDR-based phase tracking

Dawn K. Gifford, Mark E. Froggatt, Stephen T. Kreger

Author Affiliations +

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77533I (2011) https://doi.org/10.1117/12.885131
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

Optical Frequency Domain Reflectometry is used to measure distributed displacement and temperature change with very high sensitivity and precision by measuring the phase change of an optical fiber sensor as a function of distance with high spatial resolution and accuracy. A fiber containing semi-continuous Bragg gratings was used as the sensor. The effective length change, or displacement, in the fiber caused by small temperature changes was measured as a function of distance with a precision of 2.4 nm and a spatial resolution of 1.5 mm. The temperature changes calculated from this displacement were measured with precision of 0.001 C with an effective sensor gauge length of 12 cm. These results demonstrate that the method employed of continuously tracking the phase change along the length of the fiber sensor enables high resolution distributed measurements that can be used to detect very small displacements, temperature changes, or strains.

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Dawn K. Gifford, Mark E. Froggatt, and Stephen T. Kreger "High precision, high sensitivity distributed displacement and temperature measurements using OFDR-based phase tracking", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77533I (17 May 2011); https://doi.org/10.1117/12.885131

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