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Technical Data
2.2 Optical Diagrams
The optical diagrams indicate the target spot diameter at any given distance between the target object
and the sensing head.
All target spot sizes indicated in the optical diagrams are based on 90% energy.
Target Spot Diameter
(S) and Measuring
Distance (D) in Close
Target Spot Diameter
(S) and Measuring
Distance (D) in Close
Target Spot Diameter S (mm)
10
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Distance D (in)
Target Spot Diameter S (in)
Focus in inches
Focus in mm
Distance D (mm)
Close Focus D : S = Proportion between Distance (D) to Target Spot
Far Field D : S
= Proportion with Distances 10 times greater than the
Calculating the Target Spot Size
To calculate the target spot size from two known points within an
optical diagram the following formula can be used:
D
S
S
x
n
D
S
= unknown diameter of target spot
x
S
= smallest known diameter of target spot
n
S
= greatest known diameter of target spot
f
D
= distance to unknown target spot
x
D
= distance to smaller known target spot
n
D
= distance to greater known target spot
f
Figure 1: How to read the optical diagrams
Distance between Sensor and Object [in]
Distance between Sensor and Object [mm]
and Target Spot Diameter (S) in Close Focus
Close Focus Distance
D
x
n
S
S
f
n
D
f
n
Rev. O7 07/2017
TX
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