LMI Technologies Gocator Series - Clearance Distance, Field of View and Measurement Range

Gocator Line Profile Sensors: User Manual
How Gocator Works • 45
Target objects are typically moved under the sensor on a transportation mechanism, such as a conveyor
belt. Sensors can also be mounted on robot arms and moved over the target. In both cases, the sensor
captures a series of 3D profiles, building up a full scan of the object. Sensor speed and required exposure
time to measure the target are typically critical factors in applications with line profiler sensors.
Gocator sensors are always pre-calibrated to deliver 3D data in engineering units throughout
their measurement range.
Clearance Distance, Field of Viewand Measurement Range
Clearance distance (CD), field of view (FOV),and measurement range (MR)are important concepts for
understanding the setup of a Gocator sensor and for understanding results.
Clearance distance – The minimum distance from the sensor that a target can be scanned and
measured. A target closer than this distance will result in invalid data.
Measurement range – The vertical distance, starting at the end of the clearance distance, in which
targets can be scanned and measured. Targets beyond the measurement range will result in invalid data.
Field of view –The width on the X axis along the measurement range. At the far end of the
measurement range, the field of view is wider, but the X resolution and Zresolutionis lower. At the near
end, the field of view is narrower, but the X resolution is higher. When resolution is critical, if possible,
place the target closer to the near end.