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Electromagnetic Acoustic Transducers (EMATs) Design Evaluation of their Performances

机译：电磁声换能器（EMAT）的性能设计评估

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The non-destructive testing (NDT) by ultrasounds is increasingly asked by manufacturersin the framework of the products quality insurance and preventive maintenance. Itoffers ,as compared to the radiography many advantages among others: the security, theflexibility and the cost. However, this technique requires some precautions during atesting, namely :1. the use of a couplant.2. the necessity to have a good state of surface,3. The method involve mechanical contact between the power source and the piecestested.To improve the flexibility and the rapidity of this method, it would be useful togenerate and receive acoustical waves with a contactless electromagnetic probe. Thecontactless electromagnetic-acoustic transducers (EMATs) offer several advantages,which have an essential importance for the non-destructive testing with ultrasoundThis work consists of EMATs conception and construction for the contactless excitationand detection of different wavetypes. We have conceived and realised receivers andtransmitters EMATs.This paper is a report of experiments results with these different types of EMATs. Weexamine the different parameters that influence them in order to optimise them and toknow the degree of the applicability of this technique in the non-destructive testingof materials in Algeria.
机译：越来越多的制造商要求通过超声波进行无损检测（NDT） 在产品质量保险和预防性维护的框架内。它 与放射照相相比，它具有许多优势：安全性， 灵活性和成本。但是，此技术在操作过程中需要采取一些预防措施 测试，即： 1.使用耦合剂。 2.必须具有良好的表面状态， 3.该方法涉及电源与零件之间的机械接触 经过测试。 为了提高此方法的灵活性和快速性， 使用非接触式电磁探头生成和接收声波。这 非接触式电磁声换能器（EMAT）具有许多优点， 对于超声波的无损检测至关重要 这项工作包括EMAT的概念和非接触激励的构造 和检测不同的波形。我们已经构思并实现了接收器， 发射机EMAT。 本文是使用这些不同类型的EMAT的实验结果的报告。我们 检查影响它们的不同参数，以优化它们并 知道此技术在无损检测中的适用程度 阿尔及利亚的材料。

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