Technical Description; Operating Principle; Description Of The Function Units - InfraTec VarioCam Operating Instructions Manual

Operating Instruction for VarioCAM® head

3 Technical Description

Technical Description
3
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
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)
Wide angle lens
Standard lens
Telephoto lens
Close-Up Lenses (for standard lens)
Close-Up Lens
0.17x
0.5x
Operating Instructions
®
head
12.5
25
50
Focus (mm) Image field (mm²)
149
50
© InfraTec GmbH 2007
page 46.
FOV (°)
0.2 (64 x 50)
0.5 (32 x 25)
2.0 (16 x 12)
(87 x 66)
(28 x 22)
5