Thermography System VarioCAM
®
HD
3. Introduction
User Manual © InfraTec GmbH 2016 9
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 (μm)
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 is equipped with an uncooled microbolometer FPA detector (uncooled Focal Plane
Array) 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 a long mean time to failure (MTTF) in 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 (Field Programmable Gate Array) 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
■ VIS/IR/graphics mixer
■ GigE-Vision interface*
■ PC interfaces* (USB2.0/WLAN/Bluetooth)
■ Video image interfaces (DVI-D. FBAS)
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