User Manual for the Thermographic System VarioCAM
®
hr head
3. Technical Description
User Manual
© InfraTec GmbH 2012
5
3
Technical Description
3.1
Operating Principle
The VarioCAM
®
hr head is a thermographic system for the
lo
ng
w
ave
i
nfra
r
ed spectral range (
LWIR
) of
(7.5 ... 14) µm. The lens images the object scene onto a microbolometer array at a resolution of
(640 x 480) or (384 x 288) pixels. The electrical signal of the detector arrays is further processed by the
internal electronics. The electronics contains all the functions necessary for camera operation, such as
activation of the microbolometer array, A/D conversion, offset and gain correction, defective pixel
treatment, video and PC interfaces.
Operating the system is effected via the PC interfaces, available as FireWire (IEEE 1394) and RS232*.
The use of these interfaces which are available depending on their versions of equipment requires special
software packages. You will find relevant details from Chapter 8 on, Hardware and Software Installation
for VarioCAM
®
hr head*, page 22.
3.2
Description of the Functional Units
Lens
The camera lens captures the IR radiation emitted by the object in the field of view and images it on the
detector array.
F
ield
o
f
v
iew (
FOV
) and resolution/size of the measuring point (
IFOV
,
I
nstantaneous
F
ield
o
f
V
iew) are determined at the same distance from the focal length f of the lens used.
The following standard lenses are available:
Thermographic system of resolution (384 x 288) pixels
lens
focal length (mm)
min. focus (m)
IFOV (mrad)
FOV (°)
wide-angle lens
12.5
0.2
2.8
(57 x 44)
standard lens
25
0.3
1.4
(30 x 23)
telephoto lens 1
50
2.0
0.7
(15 x 12)
telephoto lens 2
75
2.0
0.47
(10 x 8)
telephoto lens 3
130
5.0
0.27
(6 x 4)
close-up lens
focal length (mm)
focus (mm) field of view (mm²)
resolution (
μ
m)
close-up 0.17x
for 25
149
(80 x 60)
209
close-up 0.5x
for 25
50
(27 x 20)
70
microscopic lens 1.0x
-
50
(13 x 10)
35
Summary of Contents for Jenoptik VarioCAM
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