Feeney Andrew, Kang Lei, Rowlands George, Dixon Steve
Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
Sensors (Basel). 2018 Jan 18;18(1):270. doi: 10.3390/s18010270.
Flexural ultrasonic transducers are principally used as proximity sensors and for industrial metrology. Their operation relies on a piezoelectric ceramic to generate a flexing of a metallic membrane, which delivers the ultrasound signal. The performance of flexural ultrasonic transducers has been largely limited to excitation through a short voltage burst signal at a designated mechanical resonance frequency. However, a steady-state amplitude response is not generated instantaneously in a flexural ultrasonic transducer from a drive excitation signal, and differences in the drive characteristics between transmitting and receiving transducers can affect the measured response. This research investigates the dynamic performance of flexural ultrasonic transducers using acoustic microphone measurements and laser Doppler vibrometry, supported by a detailed mechanical analog model, in a process which has not before been applied to the flexural ultrasonic transducer. These techniques are employed to gain insights into the physics of their vibration behaviour, vital for the optimisation of industrial ultrasound systems.
弯曲超声换能器主要用作接近传感器和用于工业计量。它们的运行依赖于压电陶瓷来产生金属膜的弯曲，从而传递超声信号。弯曲超声换能器的性能在很大程度上局限于通过在指定机械共振频率下的短电压脉冲信号进行激励。然而，弯曲超声换能器不会从驱动激励信号中瞬间产生稳态振幅响应，并且发射和接收换能器之间的驱动特性差异会影响测量响应。本研究使用声学麦克风测量和激光多普勒振动测量来研究弯曲超声换能器的动态性能，并辅以详细的机械模拟模型，该过程此前尚未应用于弯曲超声换能器。这些技术用于深入了解其振动行为的物理原理，这对于优化工业超声系统至关重要。
