5 optics, Optics, 5optics – LumaSense Technologies IGA 320/23 Benutzerhandbuch
Seite 9
IMPAC pyrometer IGA 320/23
9
5
Optics
The pyrometers are equipped ex works with one of the following optics. These optics are focusing to a cer-
tain distance, i.e. in these distances each optics achieves its smallest spot size in relation to the measuring
distance. The spot size will change in any other distance (shorter or longer).
Note: Please notice that the measuring object must be as least as big as the spot size.
Optional a close-up lens is available for the pyrometer (only for optics 250). This optics is screwed in front of
the optics and provides a small spot size in the focus distance.
The following drawing and the table shows the size of the spots in mm in dependence of the measuring dis-
tance. Values between the mentioned data can be calculated by interpolation. The spot size for measuring
distance 0 is the aperture diameter “D” of the optics.
Optics MB
a : M *
)
a
M
a
1
M
1
a
2
M
2
D
without close-up lens
250
5
500
24
1000
62
with close-up lens 1
50
1
100
16
200
46
MB 5.5
with close-up lens 2
50 : 1
120
2.4
300
27
500
55
without close-up lens
250
2.5
500
19
1000
52
with close-up lens 1
50
0.5
100
15
200
44
MB 7
with close-up lens 2
100 : 1
120
1.2
300
24
500
50
without close-up lens
250
1.6
500
17.2 1000 48.4
with close-up lens 1
50
0.3
100
14.6
200
43.2
MB 12
with close-up lens 2
160 : 1
120
0.8
300
23
500
48
14
without close-up lens
250
1.25
500
12.5 1000
35
with close-up lens 1
50
0.25
100
10.5
200
31
250
MB 18
with close-up lens 2
200 : 1
120
0.6
300
16.5
500
34
10
MB 5.5
50 : 1
16
42.3
98.5
MB 7
100 : 1
8
27.3
68.5
MB 12
160 : 1
5
21.6
57.3
14
800
MB 18
without close-up lens
200 : 1
800
4
1500
16.3
3000
42.5
10
Using the close-up lens slightly attenuates the measuring signal (due to the transmittance). To get further-
more correct measuring results, the transmission of the close-up lens (90% for the IGA 320/23) must be
entered in the software InfraWin (see 6, Settings / parameter descriptions). Alternatively the emissivity ε
can be adapted: ε
Trans
= 0.90 x ε
Object
The spot sizes, mentioned in the
table above, will be only achieved
at the adjusted distance. Decreas-
ing or increasing the measuring
distance enlarges the spot size.
Spot sizes for intermediate dis-
tances, which are not shown on
the optical profiles, may be calcu-
lated using the following formula:
Note: The
InfraWin program includes a Spot size calculator that roughly
estimates the unknown values.
Spot size [mm]
Measuring distance
D
a
a
1
a
2
M
2
M
1
M
Aperture D
Ø M
Ø M
1
Ø M
2
a
a
2
a
1
D
)
D
M
(
a
a
M
1
1
D
D)
(M
a
a
M
2
2