2 focusable optics – LumaSense Technologies IS 12-S User Manual
Page 19
IS 12 / IGA 12 Manual
Controls and Instalaltion 19
Note: The pyrometer can measure objects at any distance but the object has to be
bigger than or at least as big as the spot size of the pyrometer in the measuring
distance.
Calculating the spot sizes on different measuring distances:
Spot sizes for other measuring distances can
be calculated with the following equations
or with the IR calculator of the InfraWin
software.
Table values: a
1
= measuring distance
M
1
= spot size
D = aperture
3.3.2 Focusable optics
Focusable optics IS 12
Measuring
distance
a [mm]
Spot size M
90
[mm]
Objective
length
S [mm]
MB 14
MB 16
MB 18; 20L MB 25; 35L
O
p
ti
cs
1
a = 277 mm
0.9
0.6
0.6
0.4
30
a = 400 mm
1
0.8
0.8
0.5
9.5
a = 533 mm
1.4
1.1
1.1
0.7
0
O
p
ti
cs
2
a = 388 mm
1
0.8
0.8
0.45
30
a = 700 mm
1.8
1.5
1.5
0.8
8.6
a = 1170 mm
3
2.4
2.4
1.4
0
O
p
ti
cs
3
a = 550 mm
1.5
1
1
0.6
30
a = 3000 mm
9
6
6
3.3
3.3
a = 9500 mm
25
19
19
10.6
0
Aperture D [mm]* 13.5 to 17
13.5 to 17
10 to 13
5 to 7
Focusable optics IGA 12
Measuring
distance
a [mm]
Spot size M
90
[mm]
Objective
length
S [mm]
MB 10
MB 13; 14L
MB 18
MB 23
O
p
ti
cs
1
a = 280 mm
1.3
0.9
0.5
0.4
30
a = 400 mm
17
1.1
0.7
0.5
9
a = 520 mm
2
1.2
0.8
0.7
0
O
p
ti
cs
2
a = 390 mm
1.4
1
0.6
0.45
30
a = 700 mm
2.6
1.5
1
0.8
7.9
a = 1090 mm
4.1
2.4
1.6
1.3
0
O
p
ti
cs
3
a = 550 mm
2
1.2
0.8
0.6
30
a = 3000 mm
10.7
5.9
4.3
3.8
2.2
a = 5600 mm
20
11
8
7
0
Aperture D [mm] *
)
13.5 to 17
13.5 to 17
13.5 to 17
10 to 13
*
)
The aperture is the effective lens diameter. It is depending on the objective length. The biggest aperture value belongs to
the fully extended objective (S = 30), the smallest aperture value for objective length S = 0. Intermediate values have to be
interpolated.