AVIOTEC 8000i IR Introduction | en 9
Bosch Sicherheitssysteme GmbH
User manual
2023.10 | 02 | F.01U.414.168
2.4 Definition of optical terms
2.4.1 Illumination
Dynamic range
The dynamic range is the ratio between the darkest spot compared to the lightest spot in
the application. Use a luxmeter to determine the brightness in your application. The
dynamic range in the camera image / the detection area must be equal or less than factor
1000.
Illumination is an important influencing factor for sensible optical systems. Natural light
shows the huge range of illumination values from direct sunlight (~100.000 lx) to full moon
on a clear night (~1.0 lx).
The following table provides an overview of typical illumination values in different
application areas:
Application Area Illumination (in lx)
Storage facility 50
Process plants 200
Sales room 300
Office space 500
In general a uniformly illuminated monitoring area is advantageous for the video-based fire
detection. Backlight should be avoided.
The illumination is measured using a luxmeter in the application at a height of 1 meter with
the sensor pointing vertically upwards.
2.4.2 Focal length
The focal length of an optical system defines the distance between a light refracting lens
and the focal point. Field of view, maximum distance and field angle are dependant as
shown in the graphic below.
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