ASD Document 600540 Rev. J 34 FieldSpec® 3 User Manual
www.asdi.com Chapter 4 Fiberoptic Interface
D == effective diameter of foreoptic lens
A == foreoptic's angular field-of-view
X == distance to viewed surface
Y == diameter of field-of-view
Near Field (less than 1 meter):
Y = D + 2 * X * Tan( A/2 )
Far Field (greater than 1 meter):
Y = 2 * X * Tan( A/2 )
Figure 4-4 Field-of-view and spot size
Table 4-1 Values of D in mm for ASD Foreoptics
FR VNIR HH
1°
44.1 17.7 8.6
2°
9.7
3°
16.5 7.0
3.5°
3.4
4°
5.7
7.5°
2.3
8°
7.9 3.7
10°
6.8 3.3 2.0
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