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As the distance from the device increases, the laser beam expands. As a result, the diameter of the light spot on the surface of the object increases.
The following formula can be used to calculate the minimum object size at a certain distance. The value for the laser divergence is specified in the “Technical data” chapter of the operating instructions. The angular resolution can be adjusted depending on the device variant. Basically, the smaller the set angular resolution, the smaller objects can be detected.
Formula:
Example calculation with a minimum object size at a distance of 4 m at 0.1 degree angular resolution:
The following diagrams describe typical minimum object sizes at various distances. For reasons of better readability, the close range up to 4 m is shown in a separate diagram. When using the diagrams, the specified maximum ranges in the "Technical data" chapter must be observed, depending on the device variant.
Figure 1: Typical minimum object sizes up to 4 m
Figure 2: Typical minimum object sizes up to 120 m
The more laser pulses (HDDM+ subpulses) hit an object, the more reliably it is detected. Other factors influencing object detection can be the angle of incidence of the laser beam, the remission and the surface quality of the object. In addition, environmental conditions (e.g. extraneous light) as well as movement of the device or the object can influence object detection.
