压电换能器是超声技术的核心内容之一，在工业、农业、交通运输、医疗及军事等诸多领域发挥着相当重要的作用。换能器参数用于计算换能器的转换效率，是评价器件性能的标准参量，对于匹配网络参数的确定至关重要。然而，目前针对换能器参数的测量方法和技术在多频超声波电源的自适应匹配、集成度和测量效率等方面存在不足。根据对换能器工作机理及匹配网络的研究，结合软硬件设计技术，设计了两种直接对换能器参数进行测量的装置。

根据不同频率下换能器等效电路不同的特点，设计了基于阻抗法和相位法的测量方案，并分别进行仿真验证与误差分析。设计了基于ARM的压电换能器参数测量装置，主要包括硬件电路设计和软件程序设计。其中，信号发生电路用于产生四个特定频率的正弦波信号，并驱动换能器工作；采样电路的作用是采集换能器两端的电压值和电流值，并保持其值传输到下一个单元；峰值检波电路获得的峰值信号除了用于计算有效值以外，还可以作为相位检测电路的输入信号，利用模拟乘法器来求取两路正弦波的相位差值；A/D转换电路的目的是将连续的模拟输入信号转换为能够让STM32使用的数字化信号。设计稳定的电源模块用于保证芯片处于最佳的工作状态；DDS信号源模块采用电流极值法进行扫频，并从STM32向DDS芯片写入不同频率所需的频率控制字；数据采集与处理模块的作用是根据两种算法对换能器等效电路参数进行计算；显示控制模块根据迪文屏采用的通讯协议以及指令集完成了触摸屏和运行按键的设计。

为验证所提出的两种参数测量方法的准确性与实用性，搭建测试平台，分别对谐振频率为19kHz~40kHz的压电换能器进行多次测量。将测试结果与阻抗分析仪PV520A进行对比，发现两种方法的参数测量误差均小于2%，测量精度满足实际需求，稳定性较好，可以根据测量数据给出换能器性能匹配的依据，以此实现多频换能器的自动匹配。

Piezoelectric transducer is one of the core contents of ultrasonic technology. It plays a very important role in many fields, such as industry, agriculture, transportation, medical and military. Transducer parameters, which are used to calculate the conversion efficiency of transducers, are the standard parameters to evaluate the performance of devices, and are very important to determine the parameters of matching network. However, the current measurement methods and technologies for transducer parameters have shortcomings in the adaptive matching, integration and measurement efficiency of multi frequency ultrasonic power supply. According to the research on the working mechanism and matching network of the energy converter, combined with the software and hardware design technology, two devices for directly measuring the parameters of the energy converter are designed.

According to the different characteristics of transducer equivalent circuit at different frequencies, the measurement schemes based on impedance method and phase method are designed, and the simulation verification and error analysis are carried out respectively. A piezoelectric transducer parameter measurement device based on arm is designed, including hardware circuit design and software program design. The signal generating circuit is used to generate sine wave signals of four specific frequencies and drive the transducer to work; The function of the sampling circuit is to collect the voltage and current values at both ends of the transducer, and keep their values transmitted to the next unit; In addition to calculating the effective value, the peak signal obtained by the peak detection circuit can also be used as the input signal of the phase detection circuit, and the analog multiplier is used to calculate the phase difference of two sine waves; The purpose of A/D conversion circuit is to convert continuous analog input signals into digital signals that can be used by STM32. A stable power module is designed to ensure that the chip is in the best working state; DDS signal source module uses current extremum method to sweep frequency, and writes frequency control words required by different frequencies from STM32 to DDS chip; The function of the data acquisition and processing module is to calculate the equivalent circuit parameters of the converter according to the two algorithms; The display control module completes the design of touch screen and operation keys according to the communication protocol and instruction set adopted by Devon screen.

In order to verify the accuracy and practicability of the proposed two parameter measurement methods, a test platform was built to measure the piezoelectric transducers with resonant frequencies of 19kHz~40kHz for many times. Comparing the test results with the impedance analyzer PV520A, it is found that the parameter measurement error of the two methods is less than 2%, the measurement accuracy meets the actual needs, and the stability is good. The basis for the performance matching of the transducer can be given according to the measurement data, so as to realize the automatic matching of the multi frequency transducer.

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