基于多普勒频谱分析技术的声压复现方法研究  

Realization of air borne sound pressure using laser Doppler spectral analyzing technique

作　　者：何龙标[1] 李良杰[2] 王雪晶[2] 

机构地区：[1]中国计量科学研究院力学与声学所,北京100013 [2]北京化工大学信息科技与技术学院,北京100029

出　　处：《激光与红外》2013年第10期1104-1107,共4页Laser & Infrared

摘　　要：空气声声压量值的复现是通过实验室标准传声器实现的,标准传声器的声压灵敏度采用互易校准技术获得,它是一种间接的量值复现技术。为研究直接复现声压量值的可行性,本文在平面行波管内通过激光多普勒技术获得声场中示踪粒子的多普勒信号,对其进行频谱分析,对照声场中粒子振动方程和贝塞尔函数的求解,获得了声场中粒子的振速,依据平面行波方程计算获得管中声压,与实验室标准传声器测量结果相对照,结果表明,声压级在100 dB左右时,不同频点测量的声压偏差与传声器所得的结果低于0.3 dB。基于多普勒信号频谱分析技术获得粒子振速,为光学法复现声压量值的进一步研究奠定了基础。In order to study the feasibility of direct sound pressure realization, the Doppler signal was obtained by Laser Doppler Anemometry in travelling wave field, and spectral analysis is made. The panicle velocity is obtained by solving vibration equation and Bessel function. The sound pressure is calculated according to the relation between velocity and pressure. The comparison of pressure measured by microphone and the value deduced from the velocity shows that the deviations of the two methods are less than 0. 3 dB at different frequencies at the pressure level of 100 dB. The work could promote the research of air-borne sound unit realization by optical method.

关 键 词：声压复现 谱分析 多普勒信号 粒子速度 

分 类 号：O429[理学—声学]