采用M序列相关法测量材料界面的声散射特性

Sound scattering measurement using the M-sequence correlation technology

用Ｍ序列进行材料方向性声散射特性的测量，其基本思路是以伪随机Ｍ序列作为测试信号，利用相关的方法测得系统的脉冲响应，根据直达声和各次反射声到达时间加以相应的时窗隔离出散射脉冲信号，再进行方向性对比。本文介绍了测量的基本原理和应注意的问题。

in this paper, a new concept for sound scattering measurement of the material surface is introduced: first, measure the system impulse response by correlation using the M-sequence as input signal, next, add a time-window depending on the arrival times of the direct-arrival impulse and the scattering reflected impulses to sift out the scattering impulse, and then perform the directional contrast. The above concept's basic principle and several key problems are discussed. In addition, one specific measuring system and a representative measurement are shown.