基于声压移相的测量吸声系数的一种新方法

A new method to measure the absorption coefficient based on sound pressure shifting

吸声系数是表征吸声材料吸声性能的一个重要参数。传统的吸声系数测量方法主要有驻波管法和混响室法,而驻波管法和混响室法都存在着一些缺陷。用两个麦克风作为传感器等间距布置在吸声材料的正前方,将两个麦克风传感器所测得的电压进行移相并相互叠加,得出了吸声材料的反射系数,从而得到吸声材料的吸声系数。最后对某一吸声材料进行了实验,并将实验结果与驻波管法以及混响室法测得的结果进行了对比,结果表明该方法理论的正确性与可行性。

Absorption coefficient is an important parameter of the absorption function of the absorption material. Traditional methods to measure absorption coefficient are standing wave tube and reverberation which have some shortcomings. The phase of the sound pressure measured by two equal distance microphones placed in front of the absorption material is shifted and spliced in order to attain the absorption coefficient. In the last,an experiment for one absorption material is carried out,the experiment results compare with the results of the other method above mentioned,the result denotes that the theory is correct and practicable.