Judgment method and device capable of reducing false alarm rate of smoke detector

Abstract

The invention relates to a judgment method and device capable of reducing the false alarm rate of a smoke detector, and the device comprises a detector labyrinth with double optical paths, the double optical paths of the detector labyrinth are mutually independent and non-interfering optical paths, the detector labyrinth is internally provided with a first sensitive area corresponding to one optical path and a second sensitive area corresponding to the other optical path, a fire alarm signal is triggered when foreign matters are sensed in the first sensitive area and the second sensitive area by the corresponding light paths, and the fire alarm signal is not triggered when the foreign matters are sensed in any one of the first sensitive area and the second sensitive area by the corresponding light path. On the basis of the double-light-path labyrinth, regional judgment is added, and the probability of false alarm of the smoke detector is reduced.

Description

technical field [0001] The invention relates to a smoke detector, in particular to a judgment method and a device thereof which can reduce the false alarm rate of the smoke detector. Background technique [0002] Smoke detectors take smoke as the main detection object, and are suitable for places with smoldering stage in the early stage of fire. A smoke detector is a fire detector that responds to solid particles produced by combustion. According to the nature or strength of certain physical quantities that can be directly or indirectly changed by smoke particles, smoke detectors can be divided into ionic and photoelectric types. The ion-type smoke detector has been gradually eliminated by the market due to the fact that the ion chamber contains radioactive material "americium", coupled with the high price and difficult recycling and other factors. At present, in the fire alarm market, photoelectric smoke detectors occupy almost the vast majority of the market. The core p...

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Problems solved by technology

However, these methods have limited effects, and the above problems have not been well resolved.

In addition to the above methods, a small number of manufacturers with strong research and development capabilities have introduced dual-light path or multi-light path mazes. Through special software algorithms, it can be judged whether it is fire smoke or non-fire smoke that caused the fire alarm, which can reduce false alarms to a certain extent. The existing double-optical path or multi-optical path mazes are all concentrated in one detection sensitive area, and there are still a large part of interference signals that cannot be identified

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