级联积分梳状滤波器在超声检测系统中的应用  

Application of cascaded integral comb filter in the ultrasonic detection system

作　　者：周文佳 毛捷[1] 冷涛[1] 廉国选[1] ZHOU Wenjia;MAO Jie;LENG Tao;LIAN Guoxuan(State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院声学研究所声场声信息国家重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《应用声学》2018年第6期861-866,共6页Journal of Applied Acoustics

基　　金：中国科学院知识创新项目(CXJJ-16Z220)

摘　　要：在超声探伤系统中,通常要求回波幅度的垂直线性误差小于±5%,通常采样率需10倍于原始信号频率以上,对于高频探头来说对仪器的A/D性能要求较高。该文提出了一种基于现场可编程门阵列的对探伤信号恢复幅值方法,采用高效的级联积分梳状滤波器(CIC滤波器)及其FIR补偿滤波器进行滤波插值,在有限的采样频率下实现了高频信号的幅值恢复,并通过MATLAB和自研硬件平台进行了仿真、架构和实验,验证了CIC插值滤波器的滤波误差小于2.2%且效率高于具有同等插值效果的FIR插值滤波器,具备很好的工程应用价值。In the ultrasonic detection system,generally the vertical linearity error of the echo signal amplitude should be less than 5%.Usually,the sampling rate is 10 times higher than the original signal frequency.For probe with high frequency,the A/D performance of the equipment is required to be rather high.In this paper,an interpolation method which is based on FPGA and aiming to restore the amplitude is proposed.The efficient cascaded integral comb filter(CIC filter)and its FIR compensation filter are used as interpolation filter,so that the amplitude of high frequency signal can be regained from a limited sampling frequency.The results are verified by MATLAB,hardware platform and experiments.It is demonstrated that the error rate of CIC interpolation filter is less than 2.2%and the efficiency is higher than that of FIR interpolation filter with equivalent interpolation effect.It has great engineering value.

关 键 词：CIC滤波器 滤波插值 FIR补偿滤波器 现场可编程门阵列 

分 类 号：O426.9[理学—声学]