For position measurement you need at least one sensor for each axis.
The simplest position measurement is the distance in direction of one room axis. For objects with straight sides you may use triangulation sensors. To get a defined edge direction, you need at least two sensors.
Round objects are detected with laser scanners.
To measure the position on a plane you use two sensors in an angle of 90°.
More complex objects can be detected by camera systems with shape reconnaissance. These systems may reach their limits on large objects or high precision requirements.
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