Ct5 Correction File Header - Scanlab RTC6 PCIe Board Installation And Operation Manual

ct5 Correction File Header

The ct5-correction file header contains 16
parameters, see following table.
These can be read out and thus directly incorporated
into a user program:
• from the currently loaded correction tables by
get_table_para
• from assigned correction tables by
get_head_para
(a)
Parameter Description
0 Type of the correction table.
• = 0.0: 2D correction table
• = 1.0: 3D correction table
1 Calibration factor K
See Chapter 7.3.2 "Image Field Size and Image Field Calibration", page
2 Focal length or working distance [mm].
• For a configuration with a scan objective: the effective focal length of the objective [mm].
• For a configuration without a scan objective: the working distance A [mm].
A = distance from the optical axis of the incident laser beam at the first deflection mirror
to the image plane.
3 Stretch factor for the x direction.
Compensates the pyramid-shaped
3D markings.
4 Stretch factor for the y direction.
See parameter 3.
5 Coefficient A of the polynomial for z axis control, see
offset part, ±26 Bit.
Coefficient B of the polynomial for z axis control, see
6
linear part, ±11 Bit.
7 Coefficient C of the polynomial for z axis control, see
square part, ±4 Bit.
8 Number of the correction file.
With correction files supplied by SCANLAB, the parameter corresponds to the number in the
file name (for example, 145 for D2_145.ct5 or D3_145.ct5).
RTC6 boards
Doc. Rev. 1.0.21 en-US
7 Basic Functions for Scan Head Control and Laser Control
Notes
• With ctb-correction files, some parameter values
can exclusively be taken from its associated
*_ReadMe.txt file. These must be transferred
manually to the user program.
• A ct5 file created by converting another ctb file,
see
page
• A 1to1 correction file does not contain all
parameter data.
• Parameters
3D marking. In 2D correction tables, they are 0.
• For the same 3-axis scan system, the ABC
coefficients (parameter 5...7) in ctb-
correction files and ct5-correction files are
identical.
[bit/mm].
xy
Image Field
Section "Converting Correction Files",
180, does not contain all parameter data.
3...7 are only relevant for
167.
change which exists in the z direction of
page 170:
page 170:
page 170:
178