The Influence of Air Pressure on the Dynamics of Flexural Ultrasonic Transducers
The Influence of Air Pressure on the Dynamics of Flexural Ultrasonic Transducers
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DOI：
10.3390/s19214710
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发表时间：
2019-11-01
期刊：
影响因子：
3.9
通讯作者：
Dixon, Steve
中科院分区：
文献类型：
--
作者：
Feeney, Andrew;Kang, Lei;Dixon, Steve
弯曲超声换能器包括结合到膜的压电陶瓷盘。压电陶瓷盘的振动在膜中引起弯曲模式，从而产生超声波。该传感器主要用于接近或流量测量，设计用于大气压条件下的操作。然而，在包括水计量的应用中或在气体或液体环境的压力水平可以接近100巴的石化工厂中，对弯曲超声换能器的工业需求迅速增长。在这项研究中，表征方法，包括电阻抗分析和一发一收超声测量，以证明在空气中的弯曲超声换能器在高压接近100巴的动态性能。测量原理进行了讨论，除了修改传感器的设计，以确保在增加空气压力水平的弹性。结果突出了控制测量环境参数的重要性，并表明，虽然传统设计的弯曲超声换能器可以表现出对100巴的功能，其动态性能是不适合精确的超声测量。预计这项研究将启动新的发展超声测量系统的流体环境中的压力升高。
The flexural ultrasonic transducer comprises a piezoelectric ceramic disc bonded to a membrane. The vibrations of the piezoelectric ceramic disc induce flexural modes in the membrane, producing ultrasound waves. The transducer is principally utilized for proximity or flow measurement, designed for operation at atmospheric pressure conditions. However, there is rapidly growing industrial demand for the flexural ultrasonic transducer in applications including water metering or in petrochemical plants where the pressure levels of the gas or liquid environment can approach 100 bar. In this study, characterization methods including electrical impedance analysis and pitch-catch ultrasound measurement are employed to demonstrate the dynamic performance of flexural ultrasonic transducers in air at elevated pressures approaching 100 bar. Measurement principles are discussed, in addition to modifications to the transducer design for ensuring resilience at increasing air pressure levels. The results highlight the importance of controlling the parameters of the measurement environment and show that although the conventional design of flexural ultrasonic transducer can exhibit functionality towards 100 bar, its dynamic performance is unsuitable for accurate ultrasound measurement. It is anticipated that this research will initiate new developments in ultrasound measurement systems for fluid environments at elevated pressures.