基于双谐振声波幅相控制的高声强级校准

Calibration of High Sound Intensity Lever Based on Amplitude-Phase Control for Dual Resonance Sound Waves

对声强测量仪高声强级校准方法的发展历程、现状及水平进行论述,采用两个声压级高、失真度低的声源研发了高声强级校准系统,提出了双谐振声波幅相控制的新方法使声强级校准在频率500Hz时上限可达150dB以上,而失真度小于0.5%。给出高声强校准系统的校准实例和不确定度评估。

The calibration methods of high intensity lever for sound intensity probe,its present and history are described.Based on the two sound sources with high-pressure level and low distortion,the high sound intensity lever calibration system has been developed.A new method named amplitude-phase control for dual resonant sound waves is proposed,and new calibration system can generate high sound intensity levels up to150dB at500Hz with distortion(<0.5%).The calibration example and uncertainty evaluation of the new system are also given.