LumaSense Technologies IGA 320/23-LO User Manual
Page 17
IGA 320/23-LO Operating Manual
Controls and Connections 17
distance. The spot size at the shortest and longest distance is
mentioned in the table in section
. Spot sizes at intermediate
distances have to be calculated by interpolation.
Type (large optical head, fixed adjusted): The fixed adjusted
optical head has a similar size as the focusable optical head but
with a fixed focusing distance (see table
) as type (other
distances can be realized on request).
Note: The optical heads can be changed against another from the same type.
A recalibration of the pyrometer is not necessary.
3.5.1 Spot size data (measuring distance from the front of the lens)
Optical
head
Meas.
Distance a
(mm)
Spot size M
90
(mm)
fiber 0.4 mm
Spot size M
90
(mm)
fiber 0.2 mm
Aperture D
(mm)*
Type I
120
2.3
1.3
7
260
5.5
3
7
Type II
88 to 110
0.8 to 1.2
0.5 to 0.7
17.5 to 15.5
(focusable)
95 to 129
1.0 to 1.4
0.6 to 0.8
16.5 to 14.5
105 to 161
1.1 to 1.8
0.7 to 1.1
15 to 13.5
200 to 346
1.9 to 3.4
1.1 to 2.0
17.5 to 15.5
Type II
87
0.8
0.5
15
(fixed adjusted)
200
1.9
1.1
15
*
)
The aperture is the effective lens diameter of the optics. The aperture is dependent on the objective length which
changes if the focus distance is changed (only true for the focusable optical head II). 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 only be
achieved at the measuring
distances of the corresponding
optics or with the focusable
optics at the adjusted distance.
Decreasing or increasing the
measuring distance enlarges the spot size.
Spot sizes for intermediate distances that are not shown on the optical profiles may be
calculated using the adjoining formula.
Note: The InfraWin program includes a calculator (“IR calculator“) that roughly estimates
the unknown values.
Note: The pyrometer can measure objects at any distance, but it has to be at least as big as
the spot size of the pyrometer.
3.5.2 Adjusting the required measuring distance with optical head or
, fixed adjusted
A tape can be used to determine the distance between the object and pyrometer. The
measuring distance is always measured from the front of the lens.
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