Study on Ultrasonic power response sensitivity of the PVDF pyroelectric sensor

Abstract

The previous studies have demonstrated that the PVDF pyroelectric sensor has good effects on acoustic power measurement. As a sensor, the accuracy of the measurement results is directly related to the performance of the sensor. One of the most important performance indicators is the sensitivity of the sensor. In this study, the ultrasonic power response sensitivity of the PVDF pyroelectric sensor was defined. To study the sensitivity of the sensor, the finite element method based on the physical model of the PVDF pyroelectric sensor was used to analyze the relationship between the amplitude of output pyroelectric voltage and the acoustic power. Besides that, a large size PVDF pyroelectric sensor was used for the detection of the different acoustic power. Finally, the measurement and simulation results were compared. It is found that the amplitude of output pyroelectric voltage is basically linear with the radiated acoustic power. According to the calculation, the theoretical value of the ultrasonic power response sensitivity is 0. 1606mV/W, the simulation value is 0.1608 mV/W, and the experimental value is 0.1414 mV/W. These three values are basically equal. The study shows that the ultrasonic power response sensitivity of the PVDF pyroelectric sensor is reasonable and feasible. It provides some help for the performance study of the PVDF pyroelectric sensor and indicates the potential to measure high-intensity acoustic power.