| 周文佳,毛捷,冷涛,廉国选.级联积分梳状滤波器在超声检测系统中的应用*[J].,2018,37(6):861-866 |
| 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 |
| 投稿时间：2018-03-05 修订日期：2018-10-31 |
| 中文摘要: |
| 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AD性能要求较高。本文提出了一种基于FPGA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补偿滤波器进行插值滤波,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。 |
| 英文摘要: |
| 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 AD 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 proved 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. |
| DOI：10.11684/j.issn.1000-310X.2018.06.005 |
| 中文关键词: CIC滤波器,插值滤波,FIR补偿滤波器,FPGA |
| 英文关键词: CIC filter, interpolation, FIR compensation filter, FPGA |
| 基金项目:中国科学院知识创新项目 (CXJJ-16Z220) |
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| 摘要点击次数: 1758 |
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