AVIOTEC IP starlight 8000 Introduction | en 9
Bosch Sicherheitssysteme GmbH Operation manual 2019.01 | 10 | F.01U.318.200
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 well illuminated monitoring area is advantageous for the video-based fire
detection. Backlight should be avoided.
2.4.2 Focal length
The focal length of an optical system defines the distance between a light refracting lense and
the focal point. Field of view, maximum distance and field angle are dependant as shown in
the graphic below.
The maximum width of the field of view may be realized by the minimum focal length. This
adversely affects the maximum distance to a detectable fire (red).
The maximum distance to a detectable fire may be reached by adjusting the largest focal
length which decreases the width of the field of view to the minimum (green).
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