超声压电圆盘在空气中的幅相互易校准
Magnitude and phase reciprocity calibration of ultrasonic piezoelectric disk in air
摘要：
采用改进的三换能器互易校准方法测量了超声压电换能器在1 atm空气中的发射电压响应和自由场开路接收电压灵敏度的幅值和相位响应。在这项工作中使用的换能器是20 × 2毫米圆形压电陶瓷盘，其第一和第二径向模式分别在约100和250千赫。传感器的表征是支持和辅助的测量系统和测量的频率响应的有限元模拟。初步结果表明，发射电压响应和自由场开路接收电压灵敏度的幅度和相位响应，可以测量在一个有限的频率范围内的第一径向模式的压电陶瓷盘具有公平的精度。需要进一步的工作来证明和量化使用三换能器互易性校准方法实际获得的精度，以实现校准精度水平的换能器表征，并在B&K 4138麦克风的校准频率范围以上实现校准。
英文摘要：
A modified conventional three-transducer reciprocity calibration method is used to measure the magnitude and phase responses of the transmitting voltage response and the free-field open-circuit receiving voltage sensitivity of ultrasonic piezoelectric transducers radiating in air at 1 atm. The transducers used in this work are 20 x 2 mm circular piezoelectric ceramic disks with their first and second radial modes at approximately 100 and 250 kHz, respectively. The transducer characterization is supported and aided by finite element simulations of the measurement system and the measured frequency responses. Preliminary results indicate that the magnitude and phase responses of the transmitting voltage response and the free-field open-circuit receiving voltage sensitivity can be measured with fair accuracy in a limited frequency band around the first radial mode of the piezoelectric ceramic disk. Further work is needed to demonstrate and quantify the accuracy actually obtained using the three-transducer reciprocity calibration method, to achieve transducer characterization at a calibration accuracy level, and to achieve calibration above the calibrated frequency range of the B&K 4138 microphone.
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