一种新型环向偏心涡流探头及其在小径管缺陷检测中的应用

A Novel Circumferential Eccentric Eddy Current Probe and Its Application in Defect Detection of Small-Diameter Tubes

针对小径管缺陷的检测,传统检测方法基本为Bobbin探头,但这种方法具有不能检出缺陷的环向信息的缺点。基于涡流检测的研究,为达到检出小径管缺陷的多重信息的目的,提出并开发一种新型的环向偏心Bobbin探头。该探头兼具轴向扫描和偏心环向扫描的功能,能够对小径管缺陷的多重信息进行有效检测。具体研究内容基于涡流检测的方法,设计出适用于小径管的可偏心、可环向旋转的Bobbin探头,并建立模型进行模拟计算;通过整合获得的模拟数据,验证新型探头对于小径管缺陷的轴向、环向扫描相比于传统探头的优越性;制作探头并搭建试验系统,对所开发探头检测小径管缺陷的功能进行验证,进一步确立了该新型探头的优越性和高效性。

When it comes to the detection of small-diameter tube defects, eddy current testing using Bobbin probe is the traditional method. But this way is not available to detect the circumferential information of the defect as its inherent disadvantage. Based on the study of eddy current testing, in order to achieve the multiple information from detecting small-diameter tube defects, a novel type of circumferential eccentric Bobbin probe has been proposed and developed. This probe has the ability for both axial scanning and eccentric hoop scanning, which can effectively detect multiple information of small-diameter tube defects. The specific research contents are as follows. With the help of the eddy current testing method, the eccentric and rotatable Bobbin probe is designed suitably for small-diameter tubes, with the model built up for signal simulation. The feasibility of this novel probe is verified by integrating the obtained simulation data, showing the advantages of axial and circumferential scanning for small-diameter tube defects when compared with traditional Bobbin probes. The probe is fabricated and the testing system is established to verify the validity of the developed probe to detect small-diameter tube defects, certifying the superiority and efficiency of the new type of probe further.