本文通过与驻极体电容换能器有相同结构和相同灵敏度的电容换能器的比较,得出驻极体电容换能器中的驻极体的表面电位V_(30)与其等效气隙厚度之比,近似地等于电容换能器中极化电压V_B与其等效气隙厚度之比。只有当两换能器的等效气隙厚度相等时,驻极体的表面电位才完全等效于极化电压。 In this paper, the electret capacitance transducer has the same structure and the same sensitivity of the capacitive transducer, the electret capacitance transducer electret surface potential V_ (30) and its equivalent air gap The ratio of thicknesses is approximately equal to the ratio of the polarization voltage V_B in the capacitive transducer to its equivalent air gap thickness. Only when the equivalent air gap thickness of the two transducers are equal, the surface potential of the electret is exactly equivalent to the polarization voltage.