Thermography System VarioCAM
®
HD
3. Introduction
8 © InfraTec GmbH 2016 User Manual
3 Technical description
3.1 Functional principle
The VarioCAM
®
HD is a thermography system designed for the long-wave infrared spectral range
(LWIR) of (7.5 ... 14) µm. The lens reproduces the object scene to a microbolometer array with
(1,024 x 768) and/or (640 x 480) pixels. The electrical signal of the detector array is processed further by
the internal electronics. In this, the electronics comprises all functions required for camera operation, such
as actuation of the microbolometer array, A/D conversion, offset and gain correction, pixel correction as
well as actuation of the different interfaces.
Operation is optionally performed directly using the integrated keyboard (joystick, focus rocker switch,
function buttons) or using optional interfaces. RS232*, Ethernet* (GigE Vision)*, WLAN (IEEE802.11
a/b/g)*, Bluetooth 2.1/3.0 (IEEE802.15.1 class2)* or USB2.0* are available as interfaces. Specific
software packages are required in order to use these interfaces present depending on the equipment.
3.2 Description of the functional units
Lens
The camera lens collects the IR radiation in the field of view emitted by the measuring object and
reproduces this IR radiation on the detector array. Field of view (FOV, Field of View) and
resolution/measuring spot size (IFOV, Instantaneous Field of View) are determined at the same distance
to the focal distance f of the used lens.
The following standard lenses are available:
Thermography system with resolution of (1,024 x 768) IR pixels
Lens Focal distance (mm) Min. focus (m) IFOV (mrad) FOV (°)
Super wide-angle lens 7.5 0.2 2.3 (98.5 x 82.1)
Wide-angle lens 15 0.2 1.1 (60.3 x 47.0)
Normal lens 30 0.3 0.57 (32.4 x 24.6)
Telephoto lens 60 2.0 0.28 (16.5 x 12.4)
Super telephoto lens 120 4.0 0.14 (8.3 x 6.2)
Macro Focal distance (mm) Focus (mm)
Field of view (mm²)
Resolution (μm)
Close-up 0.2x for 30 max. 137 (85 x 63) 81
min. 70 (54 x 40) 51
Close-up 0.5x for 30 max. 47 (34 x 25) 32
min. 33 (30 x 22) 29
Close-up 0.5x for 60 max. 100 (35 x 27) 35
min. 78 (29 x 22) 28
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