Apparatus and method for monitoring laser material processing
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United States of America Patent
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Sep 21, 1993
Grant Date -
N/A
app pub date -
Aug 7, 1991
filing date -
Aug 9, 1990
priority date (Note) -
Expired
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Abstract
Apparatus and method for monitoring laser materials processing, such as laser welding and laser drilling, wherein an indication of the quality of the processing is obtained by monitoring the plasma generated spaced charge distribution near the melt pool. A metal electrode, or electrodes, is disposed near the melt pool but not in contact with the workpiece, nor necessarily in contact with the hot plasma. The electric charge distribution (one dimensional or multi-dimensional) is monitored between the electrode or electrodes and the workpiece or between the electrodes themselves. The existing laser processing nozzle (insulated from the workpiece) can be used for this purpose, multi-probes such as a quadrant nozzle, can identify the focused laser beam position in real time.
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