In view of the requirements of acoustic measurement equipment on the sensitivity and consistency of electret microphone,the open-circuit output sound pressure model of electret microphone,the influencing factors and control methods of electret microphone consistency are studied,and the structure design and prototype development of electret microphone are completed.The test results show that the sensitivity of electret microphone is 7.0 mV·Pa-1,the frequency response range is 10～40 kHz,and in the frequency range of 100～1 000 Hz,the phase consistency is kept within 1°,which meets the design requirements and the use requirements of measuring equipment.
NETL
NSTL
万方数据
