现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2015年
9期
47-50
,共4页
管线探测%参量阵浅剖仪%信号预处理方法%差频转换效率
管線探測%參量陣淺剖儀%信號預處理方法%差頻轉換效率
관선탐측%삼량진천부의%신호예처리방법%차빈전환효솔
pipeline detection%parametric array sub-bottom profiler%signal preprocessing method%difference frequency con-version efficiency
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。
非線性聲學參量陣利用聲波傳播的非線性原理，能在小換能器呎吋下得到高指嚮性的低頻聲波。低頻聲波對于淺地層信息探測具有重要意義。利用Berktay非線性自解調參量陣原理設計一款參量陣淺地層剖麵儀，併針對參量陣差頻轉換效率較低的缺點研究瞭信號預處理方法，經過Matlab倣真實驗驗證，信號預處理方法可以改善差頻轉換性能。
비선성성학삼량진이용성파전파적비선성원리，능재소환능기척촌하득도고지향성적저빈성파。저빈성파대우천지층신식탐측구유중요의의。이용Berktay비선성자해조삼량진원리설계일관삼량진천지층부면의，병침대삼량진차빈전환효솔교저적결점연구료신호예처리방법，경과Matlab방진실험험증，신호예처리방법가이개선차빈전환성능。
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.
