Millimeter resolution distributed dynamic strain measurements using optical frequency domain reflectometry

17 May 2011 Millimeter resolution distributed dynamic strain measurements using optical frequency domain reflectometry

A. K. Sang, M. E. Froggatt, S. T. Kreger, D. K. Gifford

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Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77532S (2011) https://doi.org/10.1117/12.885946
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

We describe the use of swept wavelength interferometry for millimeter resolution dynamic fiber optic strain measurements on a cyclically loaded aluminum coupon using single mode fiber. The interrogation method is based on measuring the phase along the optical fiber and correlating the change in the phase derivative to strain via calibration. This technique enabled data acquisition at 150 Hz at a 1mm spatial resolution. A maximum spatial and strain range of 8 ms and ±7,500 με, respectively, can be obtained. Measurements of the strain profile near a notch on the coupon demonstrate the utility of the high spatial resolution made possible with this technique.

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A. K. Sang, M. E. Froggatt, S. T. Kreger, and D. K. Gifford "Millimeter resolution distributed dynamic strain measurements using optical frequency domain reflectometry", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77532S (17 May 2011); https://doi.org/10.1117/12.885946

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