Theoretical Study on the Influence of the Backing Material of A PVDF Pyroelectric Sensor

PVDF pyroelectric sensor was widely used in many fields. At present, the PVDF pyroelectric sensor has been applied for acoustic measurement. However, the effect of backing on the sensitivity of sensor was not particularly studied until now. In this paper, a Physical model was established in the finite element software. According to this model, the waveform of pyroelectric signal was predicted. By changing the parameters of the backing material, the influence of the backing on the sensitivity of the sensor was analyzed. It is confirmed that the Physical model is effective and the constant pressure heat capacity, attenuation coefficient and acoustic impedance of backing material directly affect the sensitivity of the sensor.