A non-destructive technique for inspection of a Bismaleimide (BMI) composite is presented using an optical fiber
sensor. High performance BMI composites are used for Aerospace application for their mechanical strength. They are
also used as an alternative to toughened epoxy resins. A femtosecond-laser-inscribed Intrinsic Fabry-Perot
Interferometer (IFPI) sensor is used to perform real time cure monitoring of a BMI composite. The composite is cured
using the out-of-autoclave (OOA) process. The IFPI sensor was used for in-situ monitoring; different curing stages are
analyzed throughout the curing process. Temperature-induced-strain was measured to analyze the cure properties. The
IFPI structure comprises of two reflecting mirrors inscribed on the core of the fiber using a femtosecond-laser
manufacturing process. The manufacturing process makes the sensor thermally stable and robust for embedded
applications. The sensor can withstand very high temperatures of up to 850 °C. The temperature and strain sensitivities
of embedded IFPI sensor were measured to be 1.4 pm/μepsilon and 0.6 pm/μepsilon respectively.
Amardeep Kaur, Sudharshan Anandan, Lei Yuan, Steve E. Watkins, K. Chandrashekhara, Hai Xiao, and Nam Phan, "Monitoring cure properties of out-of-autoclave BMI composites using IFPI sensor," Proc. SPIE 9803, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2016, 98031Z (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 23, 2016; Published: 20 April 2016); https://doi.org/10.1117/12.2219492.
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