Operating Instruction for VarioCAM® head
3 Technical Description
Operating Instructions
© InfraTec GmbH 2007
5
3
Technical Description
3.1 Operating
Principle
VarioCAM
®
head is a thermal imaging system for the spectral range (8... 13) µm (LWIR).
The IR-lens of the camera displays the object scenery on a microbolometer array with a resolution of
320 x 240 pixels. The analogue video signal of the detector array is prepared by the internal electronics.
The electronics contain all the necessary functions for camera operation such as activation of the
microbolometer array, A/D conversion, offset- and gain correction, defective pixel treatment, and video
and PC interfaces.
There is a choice of operating the camera using RS232 or via the PC interfaces. Depending on
equipment version there is an RS232-interface and an IEEE 1394-interface (optional equipment).
Special software packages are required to use these interfaces. You will find details of these in chapter
9.3, Installation of the FireWire driver for VarioCAM
®
head page 46.
3.2 Description of the function units
Lens
The camera lens captures the IR radiation emitted by the object in the field of view and displays it on the
detector array. Field of view (FOV) and resolution (IFOV) are determined by the focal length of the lens
used. The standard lens 1.0/25 (f=25mm) has a FOV 32° x 25° and an IFOV 1.8mrad (1.8mm at 1m
object range).
The object range can be set between 0.4m and infinity.
Additional lenses are available for special applications:
Lenses
Lens
Focal distance (mm) min. focus (m)
FOV (°)
Wide angle lens
12.5
0.2
(64 x 50)
Standard lens
25
0.5
(32 x 25)
Telephoto lens
50
2.0
(16 x 12)
Close-Up Lenses (for standard lens)
Close-Up Lens
Focus (mm)
Image field (mm²)
0.17x
149
(87 x 66)
0.5x
50
(28 x 22)
InfraTec
Summary of Contents for VarioCAM
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