Figure 11: Multi-echo analysis
1
Glass pane
2
Fog
3
Rain
4
Measuring object
3.5.7
Filter
By using digital filters to pre-process and optimize the measured distance values, the
device can be tailored to the specific requirements of the respective application. This
makes it possible to prevent virtually all faults.
You can arbitrarily combine the filters. If several filters are active, then the filters are
applied sequentially to the results of the preceding filter. Processing occurs in the fol‐
lowing sequence: echo filter, particle filter, ground reference evaluation. It should be
noted, however, that the measurement data output may be delayed due to the multiple
calculation steps.
The active filter functions affect the output measured values. It is not possible to recal‐
culate the original measured values from the filtered output values.
Echo filter
The echo filter screens out unwanted measurement data and signals caused by rain,
dust, snow, and other ambient conditions. You can set whether the first, the last, or all
three echoes are output. The other pulses triggered by undesirable ambient conditions
are not taken into account.
•
First echo
: The field evaluation evaluates the first echo. In the measured value
output the first echo is output in the telegram.
•
Last echo
: The field evaluation evaluates the last echo. In the measured value out‐
put the last echo is output in the telegram.
•
All echoes
: The field evaluation evaluates the first echo. In the measured value
output all echoes are output in the telegram.
Particle filter
The particle filter blanks small, irrelevant reflection pulses in dusty environments and in
rain or snow which are caused by dust particles, raindrops, snowflakes or the like. It
should be noted that the particle filter functionality is only available on the first or last
echo and at distances of a maximum of 30 m.
3
PRODUCT DESCRIPTION
18
O P E R A T I N G I N S T R U C T I O N S | MRS6000
8022069/114M/2019-07-17 | SICK
Subject to change without notice
