Embeddable fiber optic strain sensor for structural monitoring

Amardeep Kaur; Sriram Nagarajan; Sudharshan Anandan; Lei Yuan; K. Chandrashekhara; Steve E. Watkins; Hai Xiao; Nam Phan

doi:10.1117/12.2009462

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19 April 2013 Embeddable fiber optic strain sensor for structural monitoring

Amardeep Kaur, Sriram Nagarajan, Sudharshan Anandan, Lei Yuan, K. Chandrashekhara, Steve E. Watkins, Hai Xiao, Nam Phan

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Proceedings Volume 8692, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2013; 86921W (2013) https://doi.org/10.1117/12.2009462
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2013, San Diego, California, United States

Abstract

An extrinsic Fabry-Perot interferometric (EFPI) fiber optic sensor is presented for measurement of strain at high ambient temperatures. The sensor is fabricated using a femto-second (fs) laser. The EFPI sensor is fabricated by micromachining a cavity on the tip of a standard single-mode fiber and is then self-enclosed by fusion splicing another piece of singlemode fiber. The fs-laser based fabrication makes the sensor thermally stable to sustain temperatures as high as 800 °C. The sensor is relatively insensitive towards the temperature as compared to its response towards the applied strain. The sensor can be embedded in Carbon fiber/Bismaleimide (BMI) composite laminates for strain monitoring at high ambient temperatures.

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Amardeep Kaur, Sriram Nagarajan, Sudharshan Anandan, Lei Yuan, K. Chandrashekhara, Steve E. Watkins, Hai Xiao, and Nam Phan "Embeddable fiber optic strain sensor for structural monitoring", Proc. SPIE 8692, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2013, 86921W (19 April 2013); https://doi.org/10.1117/12.2009462

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