摘要
根据市场需求,开发一款高精度传声器相位校准设备。通过分析阻抗管中平面声波的传播特点,分析阻抗管中不同安装位置间相位关系的影响因素,通过测量不确定度原理,分析出主要的影响参数为阻抗管末端的反射系数和传声器的安装间距,按照分析的结论,通过吸声末端和传声器的安装方式设计,研发出高精度传声器相位校准设备,设备能实现在(50~6000)Hz内相位差均匀分布。应用比对法来校准传声器相位,即运用一个参考传声器,校准余下待校传声器,实验数据显示采用该多通道相位校准系统在(50~6000)Hz内达到±2°的相位校准精度,达到高精度传声器相位校准设备研发的目的。
According to market demand, we developed a high - precision phase calibration equipment ot micro- phone. By analyzing the communication characteristics of planar acoustic wave in the impedance tube and the influ- encing factors of the phase relationship between different mounting positions in the impedance tube, by according to the principle of measurement uncertainty, we found out that the main influence parameters are the reflection coeffi- cient of the end of the impedance tube and the installation interval of the microphones. According to the conclusion of our analysis, through the design of the installation method of the sound absorption end and the microphone, we developed this high precision microphone phase calibration device. The device can achieve even distribution of phase difference in（50 -6000）Hz. By using comparison method to calibrate microphone phase - using a reference microphone to calibrate the remaining microphones. The experimental data show that the multi -channel phase calibration system achieves a phase calibration accuracy of ±2° within （ 50 - 6000 ） Hz, which satisfies the development purposes.
出处
《计量与测试技术》
2018年第2期34-37,共4页
Metrology & Measurement Technique
关键词
高精度传声器相位校准器
阻抗管
传声器
相位校准
high- precision microphone phase calibrator
impedance tube
microphone
phase calibration
