Figure 34: Too long exposure time: Laser line wide and saturated. The background is
visible.
NOTE
If reflectance measurements are enabled, the exposure time can also be adjusted
using a reflectance image as reference. For details,
8.5.2
Detection threshold
The
Detection threshold
defines the minimum reflectance signal that can be detected
as a peak position. Ideally, this parameter is set to a value that is higher than the
amplitude of the noise, but still low enough to detect the laser signal, see the figure
below. If
Detection threshold
is too low, noise will be registered as laser peaks. This will
result in bad image quality. If
Detection threshold
is too high, not all laser peaks will be
registered. This will result in an image where some parts are missing. Missing data will
be registered with pixel value 0 if a laser peak cannot be found in that column.
Intensity
1
ROI start
4
ROI end
3
Sensor row
2
DetectionThreshold
6
6
5
Figure 35: Analog signal with noise
1
Intensity
2
Sensor row
3
ROI end
4
ROI start
5
Detected peak
6
Not detected peaks
8.5.3
Advanced
8.5.3.1
Search direction
The search direction is used to define if the first or last peak should be used to
represent the impact position of the laser line. The
Search direction
is only relevant when
FirstLocalMax
is used as
Search Mode 3D
.
8
CONFIGURATION
48
O P E R A T I N G I N S T R U C T I O N S | Ruler3000
8026049//2021-04 | SICK
Subject to change without notice
