Laser process monitoring and evaluation

Details Laser process monitoring and evaluation Laser process monitoring and evaluation

1992-06-26

1994-02-01

Albritton, C. L.

Electric heating

Metal heating

By arc

21912163, 21912164, B23K 2602

Patent

active

052834166

ABSTRACT:
A monitoring system monitors a laser process which delivers energy from a laser source to a workpiece along a process path while producing plasma at a beam delivery point along the path. An infrared radiation detector is positioned for receiving infrared radiation from a point behind and in close proximity to the beam delivery point. The detector provides a temperature signal having a value which varies with changes in the intensity of the received infrared radiation over a predetermined test interval. A plurality of temperature limits are established with each temperature limit having a different value. The temperature signal is compared with each temperature limit and a violation indication is provided each time the temperature signal violates one of the limits. The number of violation indications for each limit are counted over the predetermined test interval. The laser process is evaluated as a function of the number of violation indications during the test interval. An output indication is provided as to the result of the evaluation.

REFERENCES:
patent: 4663513 (1987-05-01), Webber
patent: 4766285 (1988-08-01), Decailloz et al.

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