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Proceedings Paper

On the use of a laser Doppler vibrometer for quality control of picture tubes
Author(s): Steve Vanlanduit; Peter Verboven; Bart Cauberghe; Louis Huysmans; Patrick Guillaume
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Paper Abstract

Currently, the scanning laser Doppler vibrometer (SLDV) has become a standard laboratory tool for high spatial resolution vibration measurements. Though the quality of the measurement result is very high in well-controlled experiments, there are still some limitations on the application in harsh industrial environments. Firstly, the user interaction of available SLDV systems is too high, requiring trained personnel. But more important, laser drop-out can cause outliers in the measurements when non-treated (and often dark) surfaces are measured. These limitations prevent the real breakthrough of the SLDV in industry, notwithstanding the fact that a high potential exists for the use of the SLDV for quality control. In this article, a procedure will be developed to make the SLDV measurement process fully automatic and more robust. Firstly, an automatic laser calibration and component recognition method -- that is based on newly developed image processing algorithms -- is described. Secondly, a robust singular value decomposition (SVD) is introduced to eliminate laser drop-out from the measurements. The merits of the proposed methodology (measurement automation and robustification) for quality control purposes will be validated on SLDV measurements of a mask of a picture tube.

Paper Details

Date Published: 22 June 2004
PDF: 11 pages
Proc. SPIE 5503, Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 June 2004); doi: 10.1117/12.579558
Show Author Affiliations
Steve Vanlanduit, Vrije Univ. Brussel (Belgium)
TechPro Engineering (Belgium)
Peter Verboven, Vrije Univ. Brussel (Belgium)
TechPro Engineering (Belgium)
Bart Cauberghe, Vrije Univ. Brussel (Belgium)
TechPro Engineering (Belgium)
Louis Huysmans, LG Philips Displays Netherlands (Netherlands)
Patrick Guillaume, Vrije Univ. Brussel (Belgium)

Published in SPIE Proceedings Vol. 5503:
Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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