作者：李慧娟1, 陈友兴1, 席海军2, 王召巴1
作者单位：1. 中北大学仪器科学与动态测试教育部重点实验室, 山西 太原 030051;
2. 辽宁庆阳特种化工有限公司, 辽宁 辽阳 111000
关键词：超声波检测;特征提取;相关函数;位置匹配
摘要：
针对工件在超声测厚过程中存在的超声回波信号最大值或最小值位置偏移问题,采取相关函数位置匹配的方法,对回波信号进行数据处理.实验结果表明:该信号处理方法不仅避免峰值时间提取特征值的局限性,而且能够有效、准确地提取回波信号的特征值,对工件的厚度值能进行准确测量,并在工件实际检测过程中得到较好的效果.
Application of correlation matching in characteristic extraction of ultrasonic signal
LI Huijuan1, CHEN Youxing1, XI Haijun2, WANG Zhaoba1
1. The Ministry Key Lab for Instrumentation Science and Dynamic Test, North University of China, Taiyuan 030051, China;
2. The Corporation of Qingyang Chemical Industry, Liaoyang 111000, China
Abstract: In view of the problem of maximum or minimum position offset of ultrasonic echo signal in the process of ultrasonic testing thickness of workpiece, this paper adopt the method of correlation function position matching to process echo signal data. Experimental results show that the adopting signal processing method not only can avoid the limitations of peak time to extract the characteristic value, but also can effectively and accurately extract the echo signal characteristic and accurately measure the thickness of workpiece. Besides, this method has been effectively applied in the process of ultrasonic thickness automatic testing.
Keywords: ultrasonic testing;feature extraction;correlation function;position matching
2015, 41(3): 96-98 收稿日期: 2014-10-11;收到修改稿日期: 2014-12-7
基金项目: 国家自然科学基金(61201412);山西省青年科技研究基金(2012021011-5)
作者简介: 李慧娟(1988-),女,山西阳泉市人,硕士研究生,专业方向为信号与信息处理.
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