LMI Technologies Gocator 2100 Series, User Manual

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Gocator Line Profile Sensors - User Manual
Gocator Web Interface • Measurement • 168
Parameter Description
Decision See Decisions on page 154.
Region See Regions on page 153.
Filters See Filters on page 156.
Parameters
Bridge Value
The Bridge Value tool lets you calculate the "bridge value" and angle of a scanned surface. A bridge
value is a single, processed range that is basically a filtered average of a laser line profile, representing a
"roughness calculation." A bridge value is typically used to measure road roughness.
The Bridge value tool is only available when Uniform Spacing (in the Scan Mode panel on the
Scan page) is unchecked, as the tool only works with unresampled data. For more information,
see Uniform Spacing (Data Resampling) on page 50.
This measurement is only available on Gocator 2342 sensors.
The Bridge Value tool measurements use a histogram of the ranges that make up the profile, in which
the ranges are ordered from lowest to highest. The
Window and Skip parameters together determine
what segment of the heights in the histogram is used to calculate the bridge value. The following
diagram illustrates what points of the histogram would be included for calculating the bridge value
where
Window is roughly 50% and Skip is roughly 15% of the histogram.
Profile point heights in the white area are included in the calculation of the average. Profile point heights
in the grey area are excluded. By adjusting the
Window and Skip parameters, you can choose profile
point heights to remove unwanted features. In road roughness applications, you could exclude road
features, such as rocks, cracks, tining valleys, and so on, to get an accurate representation of the tire-to-
road interface. For more information on parameters, see the
Parameters table below.
Gocator compares the measurement value with the values in Min and Max to yield a decision. For more
information on decisions, see Decisions on page 154.