声强探头相位误差的电补偿技术

Electrical Compensation Technique for the Phase Error of Sound Intensity Probe

以双传声器技术为基础的声强测量方法对两个传声通道的相位特性非常敏感．本文介绍了对声强探头进行相位匹配以及使用精密相位计进行测量的方法和实例．通过在声强探头后级电路中采用一种移相网络进行相位补偿，在大部分频段上减小了相位误差，可以改善声强测量的精度．文中提供了基本的电路原理图和典型的实验数据．

Sound intensity measurement based on the two-microphone technique are highly sensitive to difference between the phase response of the microphone channels.The approach and examples of the phase matching design and the measurement by a precise phasemeter are given in this paper.After being compensated by electrical phase-shift network,the phase error between the two microphones is reduced and the accuracy of sound intensity measurement could be improved in most frequency ranges.The fundamental electronic circuit and the experimental data are shown.