Optical breakthrough sensor for laser drill

Details Optical breakthrough sensor for laser drill Optical breakthrough sensor for laser drill

1986-02-28

1991-06-25

Wallace, Linda J.

Electric heating

Metal heating

By arc

21912183, 21912171, 21912162, B23K 2604, B23K 2602

Patent

active

050269640

ABSTRACT:
An apparatus and method for detecting when a hole has been drilled through a workpiece by way of a pulse laser drilling process having a machine control for controlling whether the pulse laser drill emits laser pulses. The apparatus detects the laser pulse and produces an output signal representative thereof. The output signal is clipped and compared to a first reference signal for producing a compared output signal when the clipped output signal is greater than the first reference signal. The compared output signal triggers an enabling output signal representative of a pulse having a predetermined interval. The apparatus also detects reflected radiation from an entrance of the hole being drilled to produce an output signal which is then clipped and compared to a second reference signal to produce a disabling output signal when the output signal representative of the reflected radiation is greater than the second reference signal. When the disabling signal terminates before the enabling signal a gating pulse indicative of when a hole is drilled is generated for stopping any further laser pulse.

REFERENCES:
patent: 4087672 (1978-05-01), Yi
patent: 4417179 (1983-11-01), Fujimura et al.
patent: 4476512 (1984-10-01), Sunago et al.
patent: 4564012 (1986-01-01), Shimada et al.
patent: 4576480 (1986-03-01), Travis
patent: 4608480 (1986-08-01), Bizot et al.
patent: 4627725 (1986-12-01), Nishio et al.
patent: 4633058 (1986-12-01), Jones
patent: 4663513 (1987-05-01), Webber
Kobayashi et al., "Laser Drilling of Non-Metals," Finnominechanika-Mikrotechnika, vol. 12, No. 7, Jul. '73, pp. 193-200.

Affiliated with

Also associated with

Rating

Optical breakthrough sensor for laser drill does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical breakthrough sensor for laser drill, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical breakthrough sensor for laser drill will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1041958