Abstract
For many reasons, coated components are steadily increasing in importance in e.g. the aerogas and automobile industries. Because of the stringent safety requirements in these industries, quality control of these products is an essential part of their fabrication. Conventional non-destructive testing (NDT) techniques, however, often have serious shortcoming as regards testing, e.g. for thin metallic or ceramic coatings. Some NDT techniques have been modified to be suitable for such cases, and new techniques have already been developed and applied in those cases where the modified techniques fail. The new technique of thermal wave analysis, which can be used for the evaluation of coating thickness, is presented. For the description and detection of coating flaws other techniques, such as the eddy current pulse technique and the method of holographic soundfield visualization, can be employed. The theoretical bases of these techniques are presented and their practical application to various testing problems discussed.
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