超声波换能器在次声波合成过程中失真补偿算法的研究  

Compensatory algorithm research of ultrasonic wave transducer in process of infrasound wave's synthesis

作　　者：贾文超[1] 李林[1] 孙晶鑫[1] 

机构地区：[1]长春工业大学电气与电子工程学院,长春130012

出　　处：《电子测量技术》2007年第3期154-156,165,共4页Electronic Measurement Technology

摘　　要：本文介绍了一种次声波的合成原理,并对次声波的发射装置进行了研究,主要分析了超声波换能器输出波形对次声波频率精度的影响。采用基于换能器解卷积的方法对回波信号进行处理,应用FIR数字滤波器及LMS自适应算法,来构造解卷积滤波器。经MATLAB6.5计算机仿真实验结果证明,采用该方法对换能器进行解卷积后,得到的回波信号的带宽明显变宽,提高了次声波信号合成精度,进而改善了次声波的频谱精度。The theory of infrasound wave＇s synthesis is introduced first in this paper, and the transmit equipment of infrasound wave is studied laterly. The influence of the accuracy of infrasound wave 0roduced by the ultrasonic transducer output wave is analysed mainly. The echo wave is dealed with the method of the transducer deconvolution. The deconvolution filter is structured by the FIR digital filter equipment and LMS adaptive algorithm. It is proved that the synthesis accuracy of the infrasound wave signal is improved and the band width of the echo signal is widened obviously after getting the transducer deconvolution by adopting this method by the MATLAB 6. 5 the computer simulation experiment. The spectrum accuracy of the infrasound wave is improved.

关 键 词：次声波 超声波换能器 LMS算法 FIR滤波器 

分 类 号：TH814[机械工程—仪器科学与技术]