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Proceedings Paper

Application of wavelets for online laser process observer
Author(s): Christoph Steiger; Thomas Gruenberger; Arnold Braunsteiner; Markus Bohrer; Manfred Bammer
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Paper Abstract

The online system, plasmo process observer, enables observation of plasma created by e.g. laser welding in two frequency bands, visible and near infrared. The system offers the feature of online detection of failures like pores and enables the user to store the measured data in databases. This paper deals with both aspects. First the application of wavelets for data preprocessing as a first step of online classification of failures is introduced. This time scale-analysis is compared to standard algorithms in frequency or time domain like DFT or digital filters respectively. The second part of this paper shows the capabilities of wavelets for data compression. This is necessary due to the large amount of data generated by the system. It is shown how important data can be extracted of noisy signals by using wavelets. The process observer has been successfully implemented in welding and drilling applications for automotive and aerospace industry with a very high recognition rate of all defects.

Paper Details

Date Published: 26 March 2001
PDF: 9 pages
Proc. SPIE 4391, Wavelet Applications VIII, (26 March 2001); doi: 10.1117/12.421202
Show Author Affiliations
Christoph Steiger, Austrian Research Ctr. Seibersdorf (Austria)
Thomas Gruenberger, Austrian Research Ctr. Seibersdorf (Austria)
Arnold Braunsteiner, Incision Lasertec GmbH (Austria)
Markus Bohrer, Incision Lasertec GmbH (Austria)
Manfred Bammer, Austrian Research Ctr. Seibersdorf (Austria)

Published in SPIE Proceedings Vol. 4391:
Wavelet Applications VIII
Harold H. Szu; David L. Donoho; Adolf W. Lohmann; William J. Campbell; James R. Buss, Editor(s)

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