基于特性阻抗的测量吸声系数的一种新方法

A new method to measure the absorption coefficient based on characteristic impedance

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。基于此,根据吸声材料的表面特性阻抗是吸声材料吸声系数的一个重要参数的原理,提出了一种新的测量吸声材料吸声系数的方法。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. According to the principle that the surface characteristic impedance of the absorption material determines the absorption coefficient, a new method to measure the absorption coefficient is introduced. In the last, an experiment for one absorption material is carried out, the experiment results compare with the results of the other methods above mentioned, the result denotes that the theory is correct and practicable.