Laser drilling breakthrough detector

Details Laser drilling breakthrough detector Laser drilling breakthrough detector

1998-06-18

2000-10-31

Evans, Geoffrey S.

Electric heating

Metal heating

By arc

2191217, B23K 2638

Patent

active

06140604&

ABSTRACT:
In a pulse laser drilling process having a machine control for controlling a laser, an apparatus is provided to detect when a hole is drilled through a workpiece. The apparatus detects a laser pulse, where the laser pulse emits a laser light upon drilling impact with the workpiece. A second detection step detects sparks emitted by the workpiece, and a spark signal amplitude representative thereof is produced. The sparks produce visible wavelength light. A filter blocks the laser light and transmits the visible wavelength light. A photosensor associated with the filter senses when the spark signal amplitude diminishes below a predetermined threshold level. An output signal, responsive to the photosensor indicates when a through hole is complete and indicates to the machine control to stop any further laser pulse.

REFERENCES:
patent: 4633058 (1986-12-01), Jones
patent: 5026964 (1991-06-01), Somers et al.
patent: 5063280 (1991-11-01), Inagawa et al.

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