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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >The radiation field characteristics of piezoelectric polymer membrane transducers when operating into air
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The radiation field characteristics of piezoelectric polymer membrane transducers when operating into air

机译：压电聚合物膜换能器在空气中工作时的辐射场特性

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摘要

This paper describes the evaluation of the radiation field characteristics of PVDF membrane transducers, whereby the active area is defined by an appropriate electrode pattern when operating into air. Measurement, including conventional scanning of the fields and laser vibrometry, is supplemented by finite element modeling over the frequency range 500 kHz to 1.1 MHz. Contrary to expectation, the surface displacements are nonuniform, giving rise to premature axial focusing of the field. This is shown to be caused by generation of the zero order symmetrical Lamb wave, arising from the electric field discontinuity at the electrode boundary of the transducer.
机译：本文介绍了对PVDF膜换能器辐射场特性的评估，从而在空气中工作时，有效区域由合适的电极图案限定。在500 kHz至1.1 MHz频率范围内，通过有限元建模，可以进行包括常规的场扫描和激光振动测量在内的测量。与预期相反，表面位移不均匀，导致磁场过早聚焦。这表明是由于换能器电极边界处的电场不连续而引起的零阶对称兰姆波的产生。

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