the picture width. Both values have to be reached at the same location in the smoke plume. It
is not sufficient to measure one value at the bottom and the other value at the top of the
smoke plume.
Direction and angle of a smoke plume
The inclination angle and direction of a smoke plume are important indicators to detect
smoke. In the field of view of the camera, rising smoke plumes can have a maximum tilt angle
of 90° and will be detected.
Smoke plumes must rise in a constant direction with a minimum density to be detected by the
video-based fire detection. Irregular expanding smoke and smoke plumes rising in the
direction of the camera might not be detected.
The intelligent smoke detection covers a large area of application. Nevertheless, there might
be some disruptive factors in the operational environment of the customer. Objects with a
similar movement pattern of smoke might cause false alarms, e.g. escalators or conveyor
belts.
Smoke density
A minimum smoke density is required to identify the smoke plume.
16
en | System Overview AVIOTEC IP starlight 8000
2017.06 | 6.0 | F.01U.318.200 Operation manual Bosch Sicherheitssysteme GmbH
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