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Evaluating scattered-light signals in an optical hazard detector and outputting a dust/steam warning or a fire alarm
Evaluating scattered-light signals in an optical hazard detector and outputting a dust/steam warning or a fire alarm
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机译:在光学危险检测器中评估散射光信号并输出灰尘/蒸汽警告或火灾警报
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摘要
Particles to be detected are irradiated by first wavelength light and second wavelength light. The light that is scattered by the particles is converted into a first and second scattered-light signals. The two scattered-light signals are normalized with respect to one another such that the amplitude profile thereof approximately corresponds to larger particles such as dust and steam. Furthermore, an amplitude ratio is formed between the two scattered-light signals and an amplitude comparison value (90%) is set, which corresponds to a predeterminable particle dimension in the cross-over region between smoke and dust/steam. Mainly the first scattered-light signal is evaluated if the amplitude ratio exceeds the amplitude comparison value (90%) and a dust/steam-density signal is emitted. In the other case, mainly the second scattered-light signal that is evaluated and a smoke-density signal is emitted.
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