Apogee Instruments SI-100 Series Manuel du propriétaire - Page 9
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Field of View
The field of view (FOV) is reported as the half-angle of the apex of the cone formed by the target surface (cone
base) and the detector (cone apex), as shown below, where the target is defined as a circle from which 98 % of the
radiation detected by the radiometer is emitted.
Sensor FOV, distance to target, and sensor mounting angle in relation to the target will determine target area.
Different mounting geometries (distance and angle combinations) produce different target shapes and areas, as
shown below.
CIRCULAR
Type
Model
Half Angle
Standard
SI-111
Narrow
SI-121
Ultra-Narrow
SI-131
A simple FOV calculator for determining target dimensions based on infrared radiometer model, mounting height,
and mounting angle, is available on the Apogee website: https://www.apogeeinstruments.com/irr-calculators.
FOV Area (m²)
0 Deg
45 Deg
22°
2.069
7.627
18°
1.337
4.461
14°
0.787
2.447
60 Deg
Type
Model
45.211
Standard
SI-1H1
18.865
Narrow
SI-4HR
8.544
-
HORIZONTAL
Half Angle
Horizontal
Vertical
0 Deg
32°
13°
2.276
16°
5°
0.403
FOV Area (m²)
45 Deg
60 Deg
7.148
45.512
1.15
3.341