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12 June 2000 Characterization of mechanical vibrations in composite materials with a fiber optic multichannel interferometer
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In this paper we present the results of our experiment for the characterization of mechanical vibrations, using a multichannel interferometer with sensing optical fibers embedded into a carbon fiber board. We investigate the application of this measurement system for dynamic gradients of vibrations at medium frequency (50 Hz to 1 kHz). The optical phase is biased to operate at quadrature conditions (optical phase = π/2) in order to get the maximum sensitivity. We measure the differential optical phase of four spatially separated embedded fiber-optic channels relative to a common reference path. The tests are the calibration of the sensor response to vibrations and the spatial propagation of vibrations. This scheme provides an improvement of previous characterizations with strain gages at the surface because of the high sensitivity of the sensor, better spatial resolution (separation of the sensing regions up to 5 mm), and measurements performed inside the board. The signal processing required for phase measurements is also analyzed, as well as it is presented a comparison with the electronic measurements at the surface.
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Jose Antonio Garcia Souto and Horacio Lamela "Characterization of mechanical vibrations in composite materials with a fiber optic multichannel interferometer", Proc. SPIE 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (12 June 2000);

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