基于ITD和Teager能量的超声检测信号端点检测  

Ultrasonic Test Signal Endpoint Detection Based on ITD and Teager Energy

作　　者：李大中[1] 赵杰[1] 刘建屏[2] 蔡文河[2] 马延会[2] 

机构地区：[1]华北电力大学,河北保定071003 [2]国网冀北电力有限公司电力科学研究院(华北电力科学研究院有限责任公司),北京100045

出　　处：《华北电力技术》2017年第1期56-61,共6页North China Electric Power

摘　　要：超声检测信号端点检测的准确性直接影响金属缺陷识别系统的可靠性和识别能力。为提高在实际缺陷识别过程中端点检测的准确率,提出一种基于ITD和Teager能量的超声检测信号端点检测方法。针对钢材料缺陷超声检测信号的特点,通过将带噪声的原始检测信号进行ITD分解,获得一系列固有旋转分量(PRC)和一个单调趋势项,求平均Teager能量来进行端点检测。试验结果表明,该方法可有效检出缺陷信号端点。The accuracy of ultrasonic test signal endpoint detection affects the reliability and the recognition perform- ance of the metal defect recognition system. In order to improve endpoint detection accuracy during the actual defect recognition,the endpoint detection based on ITD and Teager energy was proposed. Taking account the characteristics of ultrasonic inspection signal of steel material defect, the original signal with noise was decomposed into several proper rotation components and a trend component by the ITD method. Average Teager energy was computed to a- chieve the endpoint detection. The experimental results show that the method can achieve endpoint detection of defect signal effectively.

关 键 词：固有时间尺度分解 Teager能量 超声检测 端点检测 

分 类 号：TN391[电子电信—物理电子学]