InfraTec VarioCAM User Manual page 10

Thermographic system of resolution (384 x 288) pixels
lens
wide-angle lens
standard lens
telephoto lens 1
telephoto lens 2
telephoto lens 3
close-up lens
close-up 0.17x
close-up 0.5x
microscopic lens 1.0x
Thermographic system of resolution (640 x 480) pixels
lens
wide-angle lens
standard lens
telephoto lens 1
telephoto lens 2
telephoto lens 3
close-up lens
close-up 0.17x
close-up 0.5x
microscopic lens 1.0x
Detector
®
The VarioCAM hr has an uncooled microbolometer FPA detector (uncooled Focal Plane Array). The
detector is thermally stabilised with high precision using a Peltier element and is thus independent of the
ambient temperature.
The various elements of the detector are microscopically minute thin-film resistors on wafer-thin
membranes, which are arranged cantilevered a few micrometers above the silicon read-out circuit. The
thermal radiation of the scene is imaged by the lens of the thermographic system on these detector
elements and absorbed by them. The temperature change of the detector elements resulting therefrom
yields electronically evaluable signals which can be read out line-wise and column-wise by a read-out
circuit.
Applying an uncooled detector guarantees quick availability of the camera function after switching it on
(start-up time < 60 seconds) and long service life (MTTF) in permanent use.
Detector electronics
The detector electronics supplies the BIAS voltages required for detector operation and further control
signals, and it takes care of the pre-processing and digitalisation of the analog video output signal from
the detector.
6
User Manual for the Thermographic System VarioCAM
focal length (mm)
12.5
25
50
75
130
focal length (mm)
for 25
for 25
-
focal length (mm) min. focus (m)
12.5
30
50
75
130
focal length (mm)
for 30
for 30
-
© InfraTec GmbH 2013
min. focus (m)
0.2
0.3
2.0
2.0
5.0
focus (mm) field of view (mm²)
149
50
50
0,2
0,3
2,0
2,0
5,0
focus (mm) field of view (mm²)
150
50
50
® high resolution
3. Technical Description
IFOV (mrad)
2.8
1.4
0.7
0.47
0.27
resolution (μm)
(80 x 60)
(27 x 20)
(13 x 10)
IFOV (mrad)
2.0
0.8
0.5
0.3
0.2
resolution (μm)
(80 x 60)
(27 x 20)
(16 x 12)
User Manual
FOV (°)
(57 x 44)
(30 x 23)
(15 x 12)
(10 x 8)
(6 x 4)
209
70
35
FOV (°)
(65 x 51)
(30 x 23)
(18 x 14)
(12 x 9)
(7 x 5)
125
42
25