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High frequency eddy current device for near surface material characterizations

 
: Hillmann, S.; Heuer, H.; Meyendorf, N.

:

Meyendorf, N.G. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Smart sensor phenomena, technology, networks, and systems 2009 : 9 - 11 March 2009, San Diego, California; The Technical Conference of Smart Sensor Phenomena, Technology, Networks, and Systems
Bellingham, WA: SPIE, 2009 (Proceedings of SPIE 7293)
ISBN: 978-0-8194-7553-4
Paper 72930S
Annual International Symposium Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring <16, 2009, San Diego/Calif.>
Conference Smart Sensor Phenomena, Technology, Networks, and Systems <2009, San Diego/Calif.>
English
Conference Paper
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()

Abstract
For near surface characterization a new high frequency eddy current device was been developed. By using a measurement frequency up to 100 MHz information of near surface areas can be acquired. Depending on the investigated material high resolution depth profiles can be derived. The obtained data with the new device were compared to those obtained with a high precision impedance analyser. It could be demonstrated that the new device measures the eddy current conductivity signal in the high frequencies much better than the impedance analyser. By sweeping the frequency from 100 kHz up to 100 MHz the technique delivers a depth profile of the electrical conductivity of the material. This kind of high frequency eddy current technique can be used for quality assurance, surface contamination control or near surface material characterization e.g. microstructure and cold work influences. It can be a powerful tool to obtain information for process control or a good / bad decision in mass production processes like for example rolling, coating, and surface treatments. The big advantage of the high frequency eddy current method is that it is fast und precise. This paper presents results with a new developed prototype Eddy-Current-Device for measurement frequencies up to 100 MHz which is first time suitable in rough industrial environment and makes expensive lab network analysers unnecessary for this kind of investigations.

: http://publica.fraunhofer.de/documents/N-148493.html