Intensity
1
ROI start
4
ROI end
3
Sensor row
2
Figure 51: The impact position of the laser in one column
1
Intensity
2
Sensor row
3
ROI end
4
ROI start
The laser line will produce a distinct light peak distributed over a number of pixels along
the sensor column. The center of this peak will be defined as the impact position of the
laser line on that sensor column, which is the range value.
8.6.2.2
Measurement method
The default algorithm in Ruler3000 is called
Hi3D
. It measures the impact position
using a high-resolution peak fitting algorithm based on the pixels in a window around
the extracted intensity peak position. The size of the window is defined by the
WAM size
setting.
This method measures range with a resolution of 1/16
th
pixel.
8.7
Triggering
There are different ways to trigger the camera to acquire images and profiles. Triggering
is used to control the initiation and rate of data acquisition. You can use an external
signal to trigger each image or every single profile. The camera can also be configured
to acquire images or profiles with regular time intervals, without an external trigger
signal.
Note that when the camera acquires 3D images, each image is a set of profiles. This
means that the acquisition of profiles in the Profile triggering concept is only applicable
for 3D images, while the Image triggering concept is relevant for both 2D and 3D
images.
8.7.1
3D triggering concepts
Different application types require different triggering concepts. Below is a table of the
most common triggering situations.
Continuous flow
No photoelectric switch is used.
Profiles are sent continuously to the PC, typically
arranged in images of at least a few hundred pro‐
files.
Examples: Crushed stone, grain, sawdust.
CONFIGURATION
8
8026049//2021-04 | SICK
O P E R A T I N G I N S T R U C T I O N S | Ruler3000
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Subject to change without notice
