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The fundamental shear horizontal (SH0) wave in plates is of great importancein the field of nondestructive testing (NDT) and structural health monitoring(SHM) since it is the unique non-dispersive guided wave mode. For practicalapplications, a phased array system based on omnidirectional SH0 wavetransducers is most useful as it can cover a wide range of a plate. However, sofar very few omnidirectional SH wave transducers have been developed. In thiswork, we proposed an omnidirectional SH piezoelectric transducer (OSH-PT) basedon a thickness poled piezoelectric ring. The ring is equally divided intotwelve sectors and the electric field is circumferentially applied, resultingin a new thickness-shear (d15) mode. Finite element analysis shows that theproposed OSH-PT can excite single-mode SH0 wave and receive the SH0 wave only.Experiments were then conducted to examine the performance of the proposedOSH-PT. Results indicated that it can generate and receive single-mode SH0 wavein a wide frequency range with nearly uniform sensitivities along alldirections. Considering its quite simple configuration, compact size and lowcost, the proposed OSH-PT is expected to greatly promote the applications of SHwaves in the field of NDT and SHM.

A nearly perfect omnidirectional shear-horizontal (SH) wave transducer based on a thickness poled, thickness-shear (d15) piezoelectric ring