Comparison of Fan shaped and Amplitude Display Eddy Current Testing Signal for Discontinuity Estimation
摘 要
阐述了涡流检测时扇形显示与幅值显示方式的原理。提出在实际的涡流检测中两种信号显示方式效果不尽相同。对所检出的缺陷,信号扇形显示能根据它的相位位置和形状大概判断其性质和深度(外伤或内伤)。信号幅值显示只能给出缺陷的幅值信号,无法得到所检测缺陷的更多信息。当信号幅值显示不能获得或者达不到报警设置水平时,信号扇形显示能获得其相位信息,为检测人员判断提供参考。 因此建议在涡流检测时以扇形显示为基础, 铺以幅值显示,以提高缺陷的检出能力和,保障产品质量。
Abstract
This article described the principle of eddy current testing and two different signal displays and their differences in ET practice. Fan-shaped display can mainly estimate the discontinuity character and depth (outside defect or inside defect) as per the phase angle and phase position of the discontinuity detected by ET. Amplitude display only can obtain the discontinuity signal, but can not obtain more information about the discontinuity. Fan-shaped display can obtain the phase information whereas amplitude display can not detect discontinuity. When the discontinuity signal does not reach the alarming level, the phase information detected by fan-shaped display can help operator estimate the discontinuity. Therefore, it is suggested that ET shall be based on fan-shaped display and referring to amplitude display in order to improve discontinuity detecting competence and products quality.
中图分类号 TG115.28
所属栏目 实践经验
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收稿日期 2012/6/8
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备注张才良(1969-), 男, 工程师,无损检测高级人员, 主要从事锅炉压力容器无损检测及质量检验工作。
引用该论文: ZHANG Cai-Liang,SHEN Xiao-Zhong. Comparison of Fan shaped and Amplitude Display Eddy Current Testing Signal for Discontinuity Estimation[J]. Nondestructive Testing, 2013, 35(12): 71~74
张才良,申小忠. 钢管涡流检测时信号扇形显示与幅值显示对缺陷判别的影响[J]. 无损检测, 2013, 35(12): 71~74
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参考文献
【1】徐可北,周俊华.涡流检测 [M].北京:机械工业出版社,2004.
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