Lumasense-technologies IGA 320/23-LO Manuel d'utilisateur télécharger pdf (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 3.5.1. 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 3.5.1) 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

(mm)

fiber  0.4 mm

Spot size M

(mm)

fiber  0.2 mm

Aperture D

(mm)*

Type I

120

2.3

1.3

260

5.5

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

0.8

0.5

(fixed adjusted)

200

1.9

1.1

)

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

3.5

D)DM(



DD)(M



1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 43 44

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