文章摘要
左建国.截止频率法提取粗晶材料超声检测的目标反射信号[J].声学技术,1998,(3):114~116
截止频率法提取粗晶材料超声检测的目标反射信号
Extraction of target echo signals for the ultrasonic testing of coarse grained materials by cut-off frequency technique
投稿时间:1997-06-17  修订日期:1997-09-01
DOI:
中文关键词: 截止频率法  粗晶材料  超声检测  信号处理
英文关键词: cut-off frequency technique  coarse grained material  ultrasonic testing  signal processing
基金项目:国家非教育系统留学回国人员B类经费资助
作者单位
左建国 衡阳钢管厂, 湖南衡阳421001 
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中文摘要:
      对于粗晶材料的超声检测,当组织噪声很强而目标反射信号又很弱时,分离谱技术及其常规的恢复算法不能起到有效的降噪作用。本文在分离频谱法的基础上,提出一种改进的信号处理技术——截止频率法。实验结果表明,该方法能从很强的组织噪声中将微弱的目标反射信号提取出来,从而有效地消除了材料组织噪声的影响。
英文摘要:
      For the ultrasonic testing of coarse grained materials, split spectrum processing(SSP) technique with conventional algorithms could not work for the reduction of material noise when the structural noise is strong while the target echoes are weak. In this paper, a new signal processing technique, cut-off frequency technique, is developed on the base of SSP. It is shown by the experimental results that the technique presented here can extract weak target echoes from strong structural noise, and hence eliminate the influences of structural noise of the material efficiently.
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