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7 Basic Functions for Scan Head Control and Laser Control
197
7.4.9 “Automatic Laser Control“
By set_auto_laser_control, automatic readjustment
of the Signals for “Laser Active” Operation – even
dynamically during execution of Mark Commands
can be achieved.
The
Ctrl
parameter determines the output port and
the
Value
parameter the output value for 100%
power at the target (set) mark speed at the Image
Field center (for the other parameters, see command
description).
This can be used to compensate for variations in laser
energy input caused by a changing power density,
spot size or processing speed.
For “Automatic Laser Control“, a position-, speed- or
vector-controlled correction of the Laser Control
Signals can be activated and combined.
• Position-dependent laser control, see Section
”Position-Dependent Laser Control”, page 199,
allows compensation of radial laser energy input
variations during execution of Mark Commands.
Such variations may be caused, for example, by a
objective edge diminution or different incidence
angles of the laser beam.
• Speed-dependent laser control, see Section
”Speed-Dependent Laser Control”, page 201,
allows compensation of laser energy input
variations during execution of Mark Commands
that resulting from an uneven
galvanometer scanner movement (acceleration
phase and deceleration phase, time-dependent
Mark Commands).
In addition, the galvanometer scanner speed can
also be transformed back into a mark speed
depending on the position.
• Encoder speed-dependent laser control, see
Section ”Encoder-Speed-Dependent Laser
Control”, page 204, allows the laser energy input
to be controlled based on the currently present
encoder speed.
• Speed-dependent laser control and
encoder speed-dependent laser control can also
be combined with each another, if
galvanometer scanner and workpiece move
simultaneously.
• Vector-defined laser control, see Section ”Vector-
Defined Laser Control”, page 206, allows linear
readjustment of a signal parameter along
parameterized mark vectors or jump vectors (see
Section ”[*]Para[*] Commands”, page 139).
This signal parameter can be combined with the
laser power control if the control parameter
Ctrl
matches
Ctrl
from set_auto_laser_control (the
current parameter Para dynamically replaces the
100% value from set_auto_laser_control) or as
an independent control (for example, as defocus).
Selectively, “Automatic Laser Control“ adjusts one of
the following signal parameters:
• 12-bit output value at the ANALOG OUT1 or
ANALOG OUT2 output port of the
LASER Connector, see also Section ”12-Bit Analog
Output Port 1 and 2”, page 74
• Output value at the 16-bit digital output port of
the EXTENSION 1 socket connector, see also
Section ”16-Bit Digital Input Port and 16-Bit
Digital Output Port”, page 78
• Output value at the 8-bit digital output port of
the EXTENSION 2 socket connector, see also
Section ”8-Bit Digital Output Port”, page 81
• Pulse length (
PulseLength
) or output period
(
HalfPeriod
) of the Laser Control Signals LASER1
and LASER2
The automatically readjusted value can be recorded
by set_trigger/set_trigger4/set_trigger8 (
Signal
n
= 24).
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