一种三维质点振速传感器灵敏度测量方法

A Measurement Method for the Sensitivity of a 3D Particle Velocity Sensor

一种基于近场声全息技术的质点振速传感器灵敏度测量方法,在没有任何特殊声源或声学设备的前提下,通过测量或重建声场中的声压和法向质点振速来计算声阻抗,实现质点振速传感器的灵敏度测量。将该方法扩展至三维质点振速传感器的灵敏度测量,在测量或重建法向质点振速的同时,也测量或重建切向质点振速,实现三维声阻抗的估算,从而同时测量计算3个方向质点振速传感器的灵敏度,并通过实验验证了所提方法的有效性。

Currently,the solution for obtaining the sensitivity of the particle velocity sensor is usually up to some special facilities or sound sources in order to create an environment where the acoustic impedance is known,and the sensitivities at three directions need to be obtained one by one.A method based on the nearfiled acoustic holography can compute the acoustic impedance through measuring or reconstructing the sound pressure and particle velocity without any special facility or sound source,and then obtain the sensitivity of the particle velocity sensor.This method is going to be extended to measure the sensitivity of a 3D particle velocity sensor.When the normal particle velocity is measured or reconstructed,the tangential particle velocity is also measured or reconstructed,and thus the 3D acoustic impedance can be estimated at the same time and the sensitivities of a 3D particle velocity sensor at x,y and z directions are able to be obtained simultaneously.Finally,an experiment is carried out to verify the efficiency of the proposed method.