Method for detecting and identifying defects in a laser beam...

Details Method for detecting and identifying defects in a laser beam... Method for detecting and identifying defects in a laser beam...

2005-08-30

2005-08-30

Stafira, Michael P. (Department: 2877)

Optics: measuring and testing

Inspection of flaws or impurities

Surface condition

C219S121630

Reexamination Certificate

active

06937329

ABSTRACT:
A method for detection and identification of defects in a weld seam created using a laser beam.According to this method, at least two measurement signals are acquired in real time delivered by optical sensors (C1to C6) detecting variations in luminous intensity of the plasma formed by the laser beam (14). These signals are then combined by applying a mathematical operation. The combined signal obtained is then compared to a predetermined threshold. Depending on the result of this comparison, a determination is made of the presence or absence of a defect corresponding to the operator used.

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S. Palanco “Spectroscopic Monitoring During Laser Welding of Aluminum Alloys for Weld Defects Diagnotics” 2003, Department of Analytical Chemistry Faculty of Sciences, University of Malaga.
Kwon, Jangwoo “Development of Neural network based Plasma Monitoring System for Laser Welding Quality Analysis” 1999 IEEE TENCON.

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