单腔压电微机械超声换能器（PMUT）声场的实验研究
An Experimental Study of the Acoustic Field of a Single-Cell Piezoelectric Micromachined Ultrasound Transducer (PMUT)
摘要：
压电微机械超声换能器（PMUT）在过去的十年中作为声发射器和接收器得到了普及。由于这些设备通常以谐振方式工作，因此它们可以以极低的功耗提供大输出声压。本文探讨了发射机的封装对空气中辐射声场的影响。我们运行简化的轴对称数值模型来观察相对于设备的封装尺寸的声场和方向性的变化。仿真结果表明，发射机的方向性显着的变化的基础上的挡板的大小。进行实验测量，以验证模拟，这证明有用的发射机，以满足应用程序的特定要求的设计包。
英文摘要：
Piezoelectric micromachined ultrasound transducers (PMUTs) have gained popularity in the past decade as acoustic transmitters and receivers. As these devices usually operate at resonance, they can deliver large output sound pressures with very low power consumption. This paper explores the influence of the transmitter's packaging on the radiated acoustic field in air. We run simplified axisymmetric numerical models to observe the change in the acoustic field and directivity with respect to the device's package dimensions. The simulations demonstrate a notable change in the directivity of transmitter based on the size of the baffle. Experimental measurements are carried out to validate the simulations, which prove useful in designing packages for transmitters to meet application specific requirements.
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