VarioCAM
®
HD head
3. Technical description
User Manual
© InfraTec GmbH 2016
7
Thermography system
with resolution of (640 x 480) IR pixels
Lens
Focal distance (mm) Min. focus (m)
IFOV (mrad)
FOV (°)
Super wide-angle lens
7.5
0.2
3.3
(93.7 x 77.3)
Wide-angle lens
15
0.2
1.7
(56.1 x 43.6)
Normal lens
30
0.3
0.83
(29.9 x 22.6)
Telephoto lens
60
2.0
0.42
(15.2 x 11.4)
Super telephoto lens
120
4.0
0.21
(7.6 x 5.7)
Macro
Focal distance (mm)
Focus (mm)
Field of view (mm²)
Resolution (
μ
m)
Close-up 0.2x
for 30
max. 137
(78 x 58)
119
min. 70
(49 x 37)
75
Close-up 0.5x
for 30
max. 47
(31 x 23)
47
min. 33
(27 x 21)
42
Close-up 0.5x
for 60
max. 100
(32 x 24)
50
min. 78
(26 x 20)
42
Detector
The VarioCAM
®
HD head is equipped with an uncooled microbolometer FPA detector (uncooled
F
ocal
P
lane
A
rray) with a resolution of (1,024 x 768) or (640 x 480) IR pixels. The individual elements of the
detector are microscopically small, thin-film resistors on extremely thin diaphragms arranged a few
micrometers above the silicon read-out circuit in an unsupported manner. The lens of the thermography
system reproduces the thermal radiation from the scene onto these detector elements and these detector
elements absorb this radiation. The temperature change of the detector elements resulting thereof results
in signals that can be analysed electronically, read-out line-by-line and column-by-column using a read-
out circuit.
The use of an uncooled detector ensures the quick availability of the camera function upon start-up
(starting time < 30 seconds) and continuous operation.
Detector electronics
The detector electronics supplies the BIAS voltages and further actuation signals required for detector
operation and ensures that the analogue output signal of the detector is pre-processed and digitalised.
Image processing electronics
With the help of an
FPGA
(
F
ield
P
rogrammable
G
ate
A
rray) and up to two* processors, real-time image
processing with the following essential functions (depending on the equipment) is implemented:
■
Detector electronics interface
■
Gain and offset correction
■
Defect pixel treatment
■
Low-pass filtration
■
Zoom generator
■
Graphics overlay*
■
IR/graphics mixer*
■
GigE-Vision interface*
InfraTec
Содержание VBIP-G
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