2 adjusting the required measuring distance, 1 optical head type i, Adjusting the required measuring distance – LumaSense Technologies ISR 12-LO Benutzerhandbuch
Seite 13: Optical head type i, E table 6.1
IMPAC pyrometers ISR 12-LO · IGAR 12-LO
12
6.1
Spot size table (measuring distance from the front of the lens, see 1.1 Dimensions)
Optical head
Type
Measuring
distance
a [mm]
Spot size
ISR 12-LO: MB 13
IGAR 12-LO: MB 10
M [mm]
Spot size
ISR 12-LO: MB 18, 25, 33
IGAR 12-LO: MB 13, 22
M [mm]
Aperture *
)
D [mm]
120
2,2
1.2
7
260
5
2.6
7
Type
Ι
(small optics)
700
14
7.2
7
88 to 110
0.8 to 1.1
0.45 to 0.6
17
95 to 129
0.9 to 1.3
0.5 to 0.75
16
105 to 161
1.1 to 1.7
0.6 to 1.0
15
200 to 346
1.5 to 2.8
0.8 to 1.5
17
247 to 606
2.0 to 5.2
1.1 to 2.7
16
Type
ΙΙ
(focusable
optics)
340 to 4500
2.8 to 42
1.5 to 22
15
87
0.75
0.45
17
200
1.5
0.8
17
600
5.3
2.7
15
Type
ΙΙ
(previous
type)
4500
42
22
15
Color mark of fiber
blue
red
*
)
The aperture is the effective lens diameter of the optics. It is depending on the objective length which is changing if the measuring distance
will be adjusted. The biggest aperture value belongs to the fully extended objective, the smallest aperture value if the objective is turned to its
smallest size. Intermediate values have to be interpolated (e.g. calculating the spot size if the measuring distance varies from the adjusted
value).
The spot sizes, mentioned in the table above, will be only achieved at the measuring distances of the corre-
sponding optics or with the focusable optics at the adjusted distance. Decreasing or increasing the measur-
ing distance enlarges the spot size.
Spot sizes for intermediate distances, that are not shown on the optical profiles, may be calculated using the
following formula:
Aperture-Ø D
Ø M
Ø M
1
Ø M
2
a
a
2
a
1
3.5
D
)
D
M
(
a
a
M
1
1
−
+
=
D
D)
(M
a
a
M
2
2
+
−
=
Note:
The InfraWin program includes a spot size calculator that roughly
estimates the unknown values (see 10.14).
Note:
The pyrometer can measure objects at any distance, objects can be smaller or
bigger than the spot size in this distance (see 9.5 Switch-off level).
6.2
Adjusting the required measuring distance
6.2.1
Optical head type I
A tape can be used to determine the distance between object and pyrometer. The measuring distance is
always measured from the front of the lens.
If the laser is switched on, its smallest spot is in the measuring distance of the corre-
sponding optics or adjusted distance and it marks the center as well as the size of the
spot.