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很多常规方法对设备在线运行状态下的壁厚检测都无能为力。而脉冲涡流具有频谱宽、信号穿透能力强和衰减时间长等优点,完全适合不拆除保温层在线高温或低温金属的壁厚检测,成为近年来国际上重点研究的一项高新技术。然而,实际设备的保温层厚度并不完全一样,因此相对的提离高度也就不同。为了获知提离对脉冲涡流壁厚检测的影响,就此进行了试验研究。结果表明,提离高度与误差之间存在相应的函数关系,并进行了定量分析,并得到了对检测结果进行合理修正的办法。
Many conventional methods can not detect wall thickness under the condition of online operation of the device. The pulse eddy current has the advantages of broad spectrum, strong signal penetrating ability and long decay time, and is completely suitable for the wall thickness detection of high temperature or low temperature metal without removing the insulation layer. It has become a high and new technology focused on international research in recent years. However, the actual equipment insulation thickness is not exactly the same, so the relative lift off height will be different. In order to know the influence of lift on pulse eddy current wall thickness testing, this study was carried out. The results show that there is a corresponding functional relationship between lift height and error, and the quantitative analysis is carried out. A reasonable correction of test results is obtained.