16 May 2005 In situ simultaneous strain and temperature measurement of adaptive composite materials using a fiber Bragg grating based sensor
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Abstract
An optical fiber sensor to simultaneously measure strain and temperature was designed and embedded into an adaptive composite laminate which exhibits a shape change upon thermal activation. The sensor is formed by two fiber Bragg gratings, which are written in optical fibers with different core dopants. The two gratings were spliced close to each other and a sensing element resulted with Bragg gratings of similar strain sensitivity but different response to temperature. This is due to the dependence of the fiber thermo-optic coefficient on core dopants and relative concentrations. The sensor was tested on an adaptive composite laminate made of unidirectional Kevlar-epoxy pre-preg plies. Several 150μm diameter pre-strained NiTiCu shape memory alloy wires were embedded in the composite laminate together with one fiber sensor. Simultaneous monitoring of strain and temperature during the curing process and activation in an oven was demonstrated.
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Hyuk-Jin Yoon, Hyuk-Jin Yoon, Daniele Marco Costantini, Daniele Marco Costantini, Veronique Michaud, Veronique Michaud, Hans Georg Limberger, Hans Georg Limberger, Jan-Anders Manson, Jan-Anders Manson, Rene Paul Salathe, Rene Paul Salathe, Chun-Gon Kim, Chun-Gon Kim, Chang-Sun Hong, Chang-Sun Hong, } "In situ simultaneous strain and temperature measurement of adaptive composite materials using a fiber Bragg grating based sensor", Proc. SPIE 5758, Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems, (16 May 2005); doi: 10.1117/12.599075; https://doi.org/10.1117/12.599075
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