In this study, a method for the deployment of a distributed fiber optic sensor on a spherical object is proposed. The optical cable was wrapped around a 114.3 mm diameter acrylic ball in a spiral formation. Two different loops were placed and fixed to the surface with either superglue or epoxy. The ball was loaded axially in a load frame and the tangential strain was measured using pulse pre-pump Brillouin optical time domain analysis (PPP-BOTDA). This data was compared with a numerical model and the suitability of this deployment scheme is discussed. Attempt will be made to correlate their notable difference with the curvature and installation procedure. Overall, the spiral shape allows for a predictable location of the fiber and both the epoxy and superglue maintain the required bond strength for strain transfer to the fiber. Although this study focuses on the effects of axial load, this deployment methodology can be used in other structural health monitoring applications such as spherical pressure vessels or other curved objects.
Matthew Klegseth, Yi Bao, and Genda Chen, "Strain measurement on the surface of diametrically loaded acrylic sphere with a distributed fiber optic sensor (Conference Presentation)," Proc. SPIE 10598, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018, 105982B (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 08, 2018; Published: 3 April 2018); https://doi.org/10.1117/12.2296626.5763088300001.
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