Scattered light smoke detector

Scattered light smoke detector

A scattered light smoke detector containing an optoelectronical assembly for measuring scatter signals detected below at least one forward scatter angle and at least one backscatter angle and evaluation electronics for determining an alarm value in accordance with the difference between the scatter...

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Hauptverfasser: LIPPUNER DANI, MARBACH GIUSEPPE, KAELIN AUGUST
Format: Patent
Sprache:eng
Schlagworte:
ALARM SYSTEMS
ORDER TELEGRAPHS
PHYSICS
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
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creator LIPPUNER DANI
MARBACH GIUSEPPE
KAELIN AUGUST
description A scattered light smoke detector containing an optoelectronical assembly for measuring scatter signals detected below at least one forward scatter angle and at least one backscatter angle and evaluation electronics for determining an alarm value in accordance with the difference between the scatter signals. Smoke signals are produced from the scatter signals by means of a pre-processing step and a measured value is obtained from the smoke signals. The measured value is formed by a linear linking of the sum of the smoke signals to the difference between the smoke signals BW, FW or by establishing the value for the difference between the smoke signals. The linear linking is calculated according to the formula k1(BW+FW)+k2(BW−FW), in which BW and FW are smoke signals and k1 and k2 represent two constants that are influenced among others by an application factor that is dependent on the environmental conditions in the installation location of the detector.
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subjects ALARM SYSTEMS
ORDER TELEGRAPHS
PHYSICS
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
title Scattered light smoke detector
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