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.
A. Kaur et al., "Strain Monitoring of Bismaleimide Composites using Embedded Microcavity Sensor," Optical Engineering, vol. 55, no. 3, SPIE, Mar 2016.
The definitive version is available at https://doi.org/10.1117/1.OE.55.3.037102
Electrical and Computer Engineering
Mechanical and Aerospace Engineering
Intelligent Systems Center
Keywords and Phrases
Carbon; Carbon fibers; Composite structures; Fiber optic sensors; Fibers; High temperature applications; Interferometers; Laminated composites; Microcavities; Optical fiber fabrication; Optical fibers; Temperature; Thermodynamic stability; Bismaleimides; Embedded sensors; Extrinsic Fabry Perot interferometer; Strain analysis; Structural monitoring; Fabry-Perot interferometers; Extrinsic Fabry-Perot interferometer; Optical-fiber sensor
International Standard Serial Number (ISSN)
Article - Journal
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01 Mar 2016