测定吸声系数的简易装置

A Simple and Easy Device Used For Measuring Sound-absorbing Coefficient

本文介绍自制吸声系数测定的简易装置,该装置按驻波管原理测定吸声系数,声压极值在驻波管内直接测得,测值能分辩至0.25dB,20分钟内声压测值的误差不大于0.3％(用标准差评价),该装置能测定纤维类各种吸声材料的正入射吸声系数,装置的总体性能评价良好。

This article imtroduces a self-made simple and easy divice used for measuring soundabsorbing coefficient.The principle of cylindrical wave measuring method is applied in the design of the device.In the cylindrical wave tule aeoustic pressure extrema can be measured with the resolution of 0.25db and the error in 20 minutes less than 0.3%(evaluated with staandard deviation).For measuring normao incidence sound-absorbing coefficient of fiber material of all kind,the device has good character.