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Optical Engineering

Strain monitoring of bismaleimide composites using embedded microcavity sensor
Author(s): Amardeep Kaur; Sudharshan Anandan; Lei Yuan; Steve E. Watkins; K. Chandrashekhara; Hai Xiao; Nam Phan
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Paper Abstract

A type of extrinsic Fabry–Perot interferometer (EFPI) fiber optic sensor, i.e., the microcavity strain sensor, is demonstrated for embedded, high-temperature applications. The sensor is fabricated using a femtosecond (fs) laser. The fs-laser-based fabrication makes the sensor thermally stable to sustain operating temperatures as high as 800°C. The sensor has low sensitivity toward the temperature as compared to its response toward the applied strain. The performance of the EFPI sensor is tested in an embedded application. The host material is carbon fiber/bismaleimide (BMI) composite laminate that offer thermally stable characteristics at high ambient temperatures. The sensor exhibits highly linear response toward the temperature and strain. Analytical work done with embedded optical-fiber sensors using the out-of-autoclave BMI laminate was limited until now. The work presented in this paper offers an insight into the strain and temperature interactions of the embedded sensors with the BMI composites.

Paper Details

Date Published: 8 March 2016
PDF: 6 pages
Opt. Eng. 55(3) 037102 doi: 10.1117/1.OE.55.3.037102
Published in: Optical Engineering Volume 55, Issue 3
Show Author Affiliations
Amardeep Kaur, Missouri Univ. of Science and Technology (United States)
Sudharshan Anandan, Missouri Univ. of Science and Technology (United States)
Lei Yuan, Clemson Univ. (United States)
Steve E. Watkins, Missouri Univ. of Science and Technology (United States)
K. Chandrashekhara, Missouri Univ. of Science and Technology (United States)
Hai Xiao, Clemson Univ. (United States)
Nam Phan, Naval Air Systems Command (United States)

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