基于光子自相关法的声压测量研究  

Study on Sound Pressure Measurement Based on Photon Auto-correlation Method

作　　者：卢涛[1] 刘纪龙 朱卫民 齐芳 LU Tao;LIU Jilong;ZHU Weimin;QI Fang(Henan University of Technology,Zhengzhou,Henan 450001,China;Henan Institute of Metrology,Zhengzhou,Henan 450000,China)

机构地区：[1]河南工业大学,河南郑州450001 [2]河南省计量测试科学研究院,河南郑州450000

出　　处：《计量学报》2024年第12期1849-1854,共6页Acta Metrologica Sinica

基　　金：河南省科技厅自然科学项目(222102220100);河南工业大学自科创新激进支持计划项目(2020ZKCJ31)。

摘　　要：为解决传统基于自相关器的实验系统检测空气自由场声压时自相关延迟时间τ值步进过大的问题,基于光子自相关法搭建了消声箱环境、并设制了无固定频移的光路系统、信号采集及处理系统。该系统将自相关延迟时间的步进值减小到1μs,相较于传统基于自相关器的实验系统声压测量误差减少0.2 dB。最后,与传声器法和传统光子自相关法进行了比较,在600~1200 Hz范围内对106.4 dB声压的测量结果表明:该声压测量方法对空气声场声压的测量最大偏差为0.6 dB。In order to solve the problem that the correlation delay time τ of the traditional autocorrelator-based experimental system is too large when detecting the air free-field sound pressure,an anechoic box environment was built,a non-fixed-frequency-shift optical system,and a signal acquisition and processing system were designed for detecting the air free-field sound pressure based on the photon correlation method.The method decreased the step value of autocorrelation delay time(τ)to 1μs,reducing the measurement error of sound pressure by 0.2 dB compared to traditional autocorrelator-based experimental systems.Finally,a comparison with the microphone method and the conventional photon autocorrelation method was made,and the results of the measurement of 106.4 dB sound pressure in the range of 600~1200 Hz showed that the maximum deviation of the proposed method for the measurement of the sound pressure in the air sound field was 0.6 dB.

关 键 词：声学计量 声压测量 光子自相关法 延迟时间 声粒子振速 传声器法 

分 类 号：TB95[一般工业技术—计量学]