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Open AccessArticle

Improved SH0 Guided Wave Transducers Based on Piezoelectric Fiber Patches

Fraunhofer IKTS, Maria Reich Str. 2, 01109 Dresden, Germany
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This paper is an extended version of the conference paper: Kim, Y; Köhler, B. Improved shear horizontal wave piezoelectric fiber patch (SH-PFP) for structural health monitoring applications. In Proceedings of the 10th International Symposium on NDT in Aerospace, Dresden, Germany, 24–26 October 2018.
Sensors 2019, 19(13), 2990; https://doi.org/10.3390/s19132990
Received: 15 May 2019 / Revised: 25 June 2019 / Accepted: 4 July 2019 / Published: 6 July 2019
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Abstract

A piezoelectric fiber patch (PFP) is a transducer type that is suitable for guided-wave-based structural health monitoring (SHM) due to its light, thin, and flexible characteristics. In our previous work, a PFP-based transducer design for selective excitation of the zero-order shear horizontal wave mode (SH0) was introduced (shear horizontal PFP (SHPFP)). In this work, two modified SH0 wave PFP transducer designs are proposed: the rounded corner design and the dual design. The degree of improvement is determined by a numerical simulation and the dual design—the design with the most promise—is experimentally realized. Laser Vibrometry measured the generated wave field, confirming the results from the simulation. The new designs can generate an almost pure SH0 wave. The dual design has a very strong directivity that is useful for several guided-wave-based SHM applications. The conclusions on the design’s properties as a transmitter are also valid for its properties as a sensor due to the reciprocity of piezoelectric transducers. View Full-Text
Keywords: shear horizontal guided waves; structural health monitoring; SHPFP; piezoelectric fiber patch; directivity; mode purity shear horizontal guided waves; structural health monitoring; SHPFP; piezoelectric fiber patch; directivity; mode purity
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Kim, Y.; Gaul, T.; Köhler, B. Improved SH0 Guided Wave Transducers Based on Piezoelectric Fiber Patches. Sensors 2019, 19, 2990.

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