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Effect of the Coating on the Stresses and Strains in an Embedded Fiber Optic Sensor

Stanford University, Department of Aeronautics and Astronautics

László P. Kollár

Technical University of Budapest, Department of Civil Engineering

Coated fiber optic sensors operating on interferometric principles have recently been considered for measuring strains and temperature inside composite materials. Owing to the complex interactions between the sensor and the material surrounding it, the relationship between the sensor output and the strains and temperature inside the material cannot be determined by simple tests. In general, the relationships providing the bridge between the sensor output and the engineering values of strain and temperature must be established via analytical models. Closed form expressions are derived which relate the strains in the composite far from the sensor to the strains inside the optical sensor. Strains were calculated inside a sensor with and without a coating in order to assess the effect of the coating on the sensor strains.

Journal of Composite Materials, Vol. 32, No. 18, 1680-1711 (1998)
DOI: 10.1177/002199839803201803


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