脉冲涡流和电磁声换能器双探头无损检测

Dual-Probe Using Pulsed Eddy Currents and Electromagnetic Acoustic Transducers for NDT Inspection

在许多情况下,只应用一种NDT技术存在不足,这就迫使NDT操作人员使用一种以上的技术以保证检测出危害被检物使用寿命或功能的缺陷。但分别实施多种技术的检测,就会延长检验时间。介绍了一种新的NDT设施,采用两种不同的非接触无损检测技术进行互补,即电磁声换能器(EMAT)和脉冲涡流(PEC)探头。检测结果表明,脉冲涡流和电磁声换能器因是非接触,所以可应用于材料生产过程中的自动在线检验,也可用于在役检验。

In many situations, the application of only one non-destructive testing（NDT） technique is generally thought to be inadequate. This drives NDT operators to carry out the inspection using more than one technique to ensure the detection of defects that are potentially harmful to the life or function of the test object. One disadvantage will be the extended and expensive inspection time if the techniques are applied separately. In this article, the introduction of a new NDT system that utilises two different non-contact techniques in a complementary mode, namely Electromagnetic Acoustic Transducers （EMATs） generating surface ultrasonic waves, and Pulsed Eddy Current（PEC） sensors, is reported. Being non-contact, they lend themselves to automatic on-line inspection that can benefit inspection of materials during the manufacturing process and whilst in service. This paper also highlights other potential benefits and presents some preliminary experimental results.