Chapter
3
Operating Instructions
Laser measurement sensor LD-MRS
28
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SICK AG · Germany · All rights reserved · Subject to change without notice
8012948/ZMQ0/2017-06-09
Product description
3.4.6
Sensing range in relation to remission
The following table
of the LD-MRS and LD-MRS HAD shows the sensing range in re-
lation to the remission.
3.4.7
Filter
Noise filter
The noise filter reduces the effects of atmospheric interference such as rain, spray or dust
with a clutter filter.This filter classifies the scanning data and distinguishes normal mea-
surements from noise.
The filter affects the field evaluation and the output measurements.
The LD-MRS has for scan planes (layers).Every second measurement within a layer takes
place at close range up to approximately 15 m (49.2 ft) with reduced sensitivity. For greater
distances, the measurements are taken at normal sensitivity. In addition, the measure-
ments are evaluated. Criteria such as proximity relationships between measurements with
normal sensitivity as well as the measuring characteristic of the sensor are taken into ac-
count.
When the filter is set, measurements classified as clutter are not transmitted to the SOPAS-
ET interface and are therefore not included in the field evaluation.
Important
The close range sensitivity is reduced by the clutter filter. Consequently, targets with a lower
remission are more difficult for the LD-MRS to identify.
Only the last echo
This filter causes only the last echo of a laser pulse to be measured. If for example part of
the energy is reflected as a first or second echo by a pane of glass or raindrop, only the last
echo of the actual object is measured. The filter affects the field evaluation and the output
measurements.
Fig. 3-8:
Sensing range in relation to remission