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Nondestructive and contactless determination of layer and coating thickness

: Sklarczyk, C.; Netzelmann, U.; Kreier, P.; Gebhardt, W.


Shull, P.J. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nondestructive evaluation and health monitoring of aerospace materials, composites, and civil infrastructure IV : 8 - 10 March 2005, San Diego, California, USA
Bellingham/Wash.: SPIE, 2005 (SPIE Proceedings Series 5767)
ISBN: 0-8194-5748-5
Conference "Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure" <2005, San Diego/Calif.>
Fraunhofer IZFP ()
contactless; layer thickness; millimeterwave; millimeter wave; airborne ultrasound; thermography

The paper describes some new developments in the field of contactless and nondestructive determination of the layer and coating thickness on different substrates. 1) The first method is based on millimeterwaves which are emitted and received by a compact integrated radar sensor. 2) Another approch is based on thermal effects induced in the coating by flash heating or laser light heating. The temperature response of the test object is monitored by an infrared sensor. 3) With the help of an airborne ultrasonic transducer the thickness of powder coating, e.g. ceramics-coating on steel, can be determined contactlessly with an accuracy of better than 5 µm.