RTC6 boards
Doc. Rev. 1.0.21 en-US
8 Advanced Functions for Scan Head Control and Laser Control
214
8.1.3 Monitoring the Positioning
For some applications, it is important to monitor and,
if necessary, to document the scan system
positioning even during operation.
For this purpose, the actual position of the scan axes
must be set to be returned from the scan system by
control_command. The returned actual position
values can be queried then by get_values or recorded
by set_trigger/set_trigger4/set_trigger8
(1)
.
If the returned actual positions of the scan axes are to
be compared with the Cartesian target coordinate
values (X, Y, Z), then these must be transformed back
by the corrections made on the RTC6 PCIe Board,
Chapter 7.3.6 ”Output Values to the Scan System”,
page 181.
For runtime reasons, the backward transformation
needs to subsequently be performed by the PC rather
than on the RTC6 PCIe Board itself. For this, all
correction and transformation settings currently
assigned to the scan system can be transferred from
the RTC6 PCIe Board to the PC by upload_transform.
Afterwards, an individual xy value pair or an
individual z value can be backward transformed by
transform.
By get_transform/get_transform_offset (see also
get_waveform), an entire series of xy value pairs or
z values previously recorded by
set_trigger/set_trigger4/set_trigger8 can be
backward transformed.
Notes
• For some forward transformations, a backward
transformation is not possible:
• Furthermore, backward transformation is not
possible if a noninvertable transformation matrix
has been defined during forward transformation
(notice: clipping to ±50 for each individual matrix
coefficient; see Chapter 8.2 ”Coordinate
Transformations”, page 224). The non-
invertability is already reported by
upload_transform.
(1) Due to communication runtimes, the currently
returned actual positions are several clock pulses later
than the currently outputted control signals.
Forward
transformation
Backward
trans-
formation
possible?
Wobbel motion
(#2 on page 181)
no
Global coordinate
transformation
(#3 on page 181)
no
Processing-on-the-fly
correction
(#4 on page 181)
no
Coordinate transformations
(total matrix and offset) to the
x and y coordinates
(#5 and #6 on page 181)
yes
Offset to the z
coordinate
(#6 on p
age 181)
yes
Clipping to the limits of the
controllable Image Field
(#7 on page 181)
no
2D Image Field correction /
3D Image Field correction
(#8 on page 181)
yes
Gain and offset correction of
automatic self-calibration
(#9 on page 181)
yes
Clipping to the maximum
possible control values
no
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