有限液态介质样品声衰减的实验室测试新方法

A new method for measuring sound attenuation coefficient of liquid sample of limited volume

本文介绍了一种在实验室条件下利用声脉冲测定有限容量液态介质样品声衰减系数的测试方法．该方法根据声纳方程原理导出了与测试系统参数和声场参数无关的计算式，从而避开了对测试系统参数和声场参数的测量．采用截取未被边界散射干扰的直达声脉冲的部分信号进行频谱分析，消除了在有限样品情况下必然存在的边界散射干扰．同时采用多次统计平均的做法抑制了噪声干扰．

A new mehod is given for measuring sound attenuation of liquid sample of lim-ited volume by sound pulse. Based on the sonar equation, this paper gives a formula un-concerned with parameters of the souwt field and the measuring system, and makes spec-trum analysis of only a part of the received signal that is not interfered by signals scatteredfrom the boundaries. The statistical average method to restrain the noise level is alsoadopted.