LMI Gocator 2000 Family, User Manual

Page: 58 / 194

Setup • 58 Gocator 2000 Family
Calibration
Calibration procedures can be used to compensate for sensor mounting inaccuracies, to align multiple
sensors into a common coordinate system, and to determine the resolution of an encoder.
Gocator supports two types of calibration procedures: Alignment Calibration and Travel Calibration .
Travel calibration performs essentially the same role as alignment calibration, but calibrates encoder
resolution and Y-axis offsets in addition to the corrections provided by alignment calibration.
Once calibration has been completed, the values derived will be saved automatically and reloaded each
time the sensor is reset or powered up.
Calibration States
A Gocator can be in one of three calibration states: None, Manual, and Auto.
Calibration States
State Explanation
None Sensor has no calibration. Ranges are returned in default sensor
coordinates.
Manual User has manually edited sensors’ translation field or encoder resolution.
Auto Sensor is calibrated using either alignment or travel calibration.
An indicator within the Calibration panel will display CALIBRATED in green if calibrated, or NOT
CALIBRATED in red if not.
Alignment vs. Travel Calibration
The table below summarizes the differences between alignment calibration and travel calibration.
Alignment Calibration vs. Travel Calibration
Alignment Calibration Travel Calibration
Target Type Flat Surface or Cal Bar Cal Disk or Cal Bar
Target/Sensor Motion Stationary Linear Motion
Calibrates Tilt Yes Yes
Calibrates Z-axis Offset Yes Yes
Calibrates X-axis Offset Yes (Cal Bar Required) Yes
Calibrates Y-axis Offset No Yes (for Staggered orientation only)
Calibrates Encoder No Yes
Refer to the To clear recorded data section (page 39) for definitions of coordinate axes. Calibration
disks and bars are described in the Calibration Targets (page 21).
The procedures to perform alignment calibration and travel calibration are described in the next
sections. After calibration, the coordinate system for laser profiles will change from Sensor Coordinates
to System Coordinates.