Faro FOCUS3D X 130 User Manual page 107

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FARO Laser Scanner Focus X 130 Manual
January 2014
automatically use the compass data for the scan registration, switch the Use
Compass button to ON, else switch it to OFF. This setting affects the current
scanning parameters and has the same function as the equivalent button in the
parameters settings. See "Setting the Scanning Parameters" on page 41.
You can monitor the current orientation of the scanner on this screen. Initially,
when entering this screen, the orientation is not displayed. To see the current
orientation of the scanner, touch the Update Compass button on the bottom. For
the measurement, the scanner needs to turn horizontally by 360 degress. Please
ensure that the scanner can move freely and do not sway the scanner during the
measurment.
As soon as the scanner has completed the rotation and determined its orientation,
a compass will be displayed as it would appear if mounted on top of the scanner.
This compass illustrates the current scanner orientation. Additionally, the
measured orientation value will be displayed in degrees. The given orientation
refers to the direction to which the scanner's left side is currently facing (the left
side if you are standing in front of the scanner's display).
To get updated orientation data, e.g. if the scanner has been moved to another
position, you need to touch the Update Compass button again.
This manual compass measurement only affects the output on this screen and it is
not necessary for the orientation data measured during scanning. During
scanning an orientation measurement is performed automatically.
The accuracy of compass measurements can be affected by magnetic or other
environmental interference. An indicator of the strength of environmental
interference and thus of the current compass measurement accuracy is the
displayed Horizontal field strength of the magnetic field. The typical strength
of the earth's magnetic field depends on geographical position and varies from
0.3 to 0.6 gauss (G). The displayed horizontal field strength is lower than the
absolute field strength because of the inclination of the field. For example, the
typical horizontal field strength for Europe is about 0.2 gauss.
If the measured field strength differs a lot from the expected field strength there
might be a strong artificial magnetic field near the scanner that probably affects
the measurement. To get the most reliable orientation data for the scan
registration, avoid positioning the scanner near to strong magnetic fields. If the
measured horizontal field still significantly differs, you may switch the use of the
compass data to OFF.
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Chapter 6: The Focus X 130 Controller Software