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en | System Overview
AVIOTEC IP starlight 8000
2020.08 | 01 | F.01U.391.015
Operation and Commissioning Manual
Bosch Sicherheitssysteme GmbH
The video-based fire detection is optimized for smoke of smoldering fires. The algorithm
analyzes smoke based on physical characteristics. Typically a plume of smoke is formed in a
regular upward motion of smoke at the same position. This is characterized by a thick column
of smoke which is directly visible. Speed and angle of smoke may vary. The maximum
detectable speed can be found in the chapter
Technical data, page 47. Only color-neutral
smoke (white, grey, black) will be detected by the smoke algorithm.
The area in which the smoke density decreases is called ambient smoke. The smoke motion is
not directly visible. Ambient smoke will not be detected.
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2
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1
Ambient smoke
2
Smoke plume
3
Fire
Minimum smoke width and motion speed
A minimum speed of smoke is needed together with a minimum width of the smoke plume to
be detected by the video-based fire detection. The minimum motion speed of smoke and the
minimum width 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 (see chapter
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, moving smoke plumes can have a maximum tilt angle
of 90° and will be detected.
