参量阵浅剖仪及其信号预处理方法研究

摘要

Nonlinear principle of acoustic wave propagation is applied to the nonlinear acoustic parametric array,and the high directivity low frequency sound wave is obtained by a small size transducer. Low frequency sound wave is great significance for shallow stratum information detection. A parametric array sub⁃bottom profiler is designed with Berktay nonlinear self⁃demodu⁃lation parametric array principle,and the signal preprocessing method is studied to improve the disadvantage of low parametric array difference frequency conversion efficiency. The Matlab simulation experiments prove that the performance of difference fre⁃quency conversion is improved by the signal preprocessing method.%非线性声学参量阵利用声波传播的非线性原理，能在小换能器尺寸下得到高指向性的低频声波。低频声波对于浅地层信息探测具有重要意义。利用Berktay非线性自解调参量阵原理设计一款参量阵浅地层剖面仪，并针对参量阵差频转换效率较低的缺点研究了信号预处理方法，经过Matlab仿真实验验证，信号预处理方法可以改善差频转换性能。