| 数字化电磁无损检测信号的频域数字滤波 |
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| 引用本文： | 何岭松,周义刚,康宜华. 数字化电磁无损检测信号的频域数字滤波[J]. 无损检测, 2003, 25(4): 195-197 |
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| 作者姓名： | 何岭松 周义刚 康宜华 |
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| 作者单位： | 华中科技大学,机械学院,武汉,430074 |
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| 基金项目： | 863计划资助项目 ( 2 0 0 1AA42 3 2 3 0 ) |
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| 摘 要： | 在电磁检测中，检测信号在空间上与被测缺陷对应，以时间基为基础的模拟信号处理方法有时很难实现频段内的有效滤波，数字滤波方法则可以达到精确滤波的目的。为此，提出了一种零相位的、通带最平的数字滤波器构造方法和以FFT(快速傅里叶变换)为基础的快速频域数字滤波算法，可有效处理电磁检测信号中低频波动和高频干扰。
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| 关 键 词： | 电磁检验 数字滤波器 降噪 信号处理 |
| 文章编号： | 1000-6656(2003)04-0195-03 |
| 修稿时间： | 0203-02-17 |
DIGITAL FILTER IN FREQUENCY DOMAIN AND ITS APPLICATION TO COMPUTERIZED ELECTROMAGNETIC NONDESTRUCTIVE TESTING |
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| HE Ling song,ZHOU Yi gang,KANG Yi hua. DIGITAL FILTER IN FREQUENCY DOMAIN AND ITS APPLICATION TO COMPUTERIZED ELECTROMAGNETIC NONDESTRUCTIVE TESTING[J]. Nondestructive Testing, 2003, 25(4): 195-197 |
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| Authors: | HE Ling song ZHOU Yi gang KANG Yi hua |
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| Abstract: | The signals of electromagnetic testing are directly related to faults or flaws in space domain. It is difficult to filter those spatial signals in the time domain with analog signal processing. So a method of frequency digital filter has been proposed in which a symmetrical frequency structure for producing the linear phase response of the filter and a digital Butterworth filter for producing the maximum flat frequency pass band are used. The rapid digital filtering algorithm is based on FFT(fast Fourier transform). The long term noise caused by the swing of sensor and the short term noise caused by electromagnetic waves can be removed successfully by the method. |
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| Keywords: | Electromagnetic testing Digital filter Denoise Signal processing |
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