Automatic Measurement of the Equivalent Static Capacitance of Ultrasonic Transducers for Dynamic Matching

摘要：

The ultrasonic piezoelectric transducers have been widely applied in industrial fields, and they should be well matched to ensure its power transfer efficiency or measure accuracy. However, the electric characteristics of the transducers vary greatly with temperature, which will cause the deficiency of static matching. The existing tuning method or dynamic matching method may compensate for the variations, but they both have some limitations in applications. In this paper, a method based on the Wien bridge oscillation circuit is proposed to dynamically measure the equivalent static capacitor of ultrasonic piezoelectric transducer. It can overcome the limitations facing the conventional dynamic matching and help to realize self-adjusting of the matching inductors. This method is adaptable for a variety of ultrasonic instruments and devices, especially for the ultrasonic flow meters.

关键词： ultrasonic piezoelectric transducer Wien bridge equivalent static capacitor dynamic measurement

作者: Qiang Luying Liu Jilin Fu Xin

作者单位: Department of Mechanical Engineering,Zhejiang University,Hanzhou 310027,China

会议类型: 国际会议

会议名称: 2011 10th International Conference on Electronic Measurement & Instruments(第十届电子测量与仪器国际会议 ICEMI2011)

会议地点: 成都

会议语种:英文

页码: 555-559

在线出版日期: 2011-08-16（万方平台首次上网日期，不代表论文的发表时间）