CEM DT-8833 - Understanding Distance and Spot Size

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5
Distance & Spot Size
As the distance (D) from the object increases, the spot size
(S) of the area measured by the unit becomes larger. The
relationship between distance and spot size for each unit is
listed below. The focal point for each unit is 914mm (36”).
The spot sizes indicate 90% encircled energy.
Fig: 1
MODEL:8833 D:S=13:1
Sensor Beam
D
mm
Distance(D) to Spot Size(S)
inch
16mm
Laser Beam
S
10@130
30@390
50@650
0.4@5.2
1.2@15.6
2.0@26