Sound absorption coefficient is usually defined in frequency domain for which the plane wave is used as incident wave,however,this situation may not be the case for in-situ measurement.
吸声系数是针对平面波入射条件下定义的声学参量。 在实际(或现场)测量时,往往不满足平面波入射条件。
参考来源 - 基于阻抗反演技术的现场吸声测量研究Based on comparing this method with traditional method-standing wave ratio in laboratory testing, this paper applied this method to determine the sound absorption coefficient in the condition of perpendicular incidence in-situ .
笔者在将其与传统的驻波比法进行实验室测量比较的基础上,将这种方法应用于现场条件下材料垂直入射吸声系数测量。
参考来源 - 应用传递函数法进行吸声系数的现场测量·2,447,543篇论文数据，部分数据来源于NoteExpress
The characteristics of the wedge is that the high sound-absorption coefficient remains under the high water pressure.
此种尖劈的突出特点是在高压下仍保持高的吸声系数。
It found that the graphite changed the density of the coating, and improved the sound-absorption coefficient of the coating.
试验结果表明，石墨改变了涂层的密度，提高了涂层的吸声系数。
In the measurement of sound absorption coefficient in random incidence and determination of sound power levels of noise sources, the reverberation room is used very extensively.
混响室是声学专业的实验室用房，它在测量声波无规入射时材料的吸声系数和测量噪声源的声功率级中得到了广泛应用。
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