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Key aspects of piezoelectric actuation of circular-crested guided elastic waves (ccGEW) in homogeneous plates are investigated experimentally and studied with finite element analysis (FEA). The specific implementation of fiber-optic strain transduction presented offers virtually distortion-free conversion of radial GEW displacements with a flat transfer characteristic and negligible interference with...
We present a development study of a robust inter-ferometric transducer for elastic deformations excited by mechanical vibrations. In contrast to known methods using piezoelectric, fiber Bragg grating and Fabry-Perot interferometer sensors, we deal with pronounced spatially distributed transduction based on arbitrary shaped fiber segments like fiber optic coils. This approach allows, e.g., an omnidirectional...
We present a modeling study devoted to an omnidirectional fiber-optic transducer for elastic ultrasound waves. A coil-wound single mode fiber is attached to the surface of the device under test. The interferometric detection of strains is accomplished with the help of a reference coil, a 3×3 coupler, a laser or superluminescent LED, and two avalanche photodiodes. Since practical coil diameters of...
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