Photoelectric fire smoke alarm and smoke detection deviation compensation method thereof

Abstract

The invention relates to the technical field of smoke alarms, in particular to a photoelectric fire smoke alarm and a smoke detection deviation compensation method thereof. The photoelectric fire smoke alarm comprises a photosensitive sensor and a first light-emitting tube which are arranged in a maze; the two sides of the photosensitive sensor and the two sides of the first light-emitting tube are provided with light barriers used for preventing emitted light of the first light-emitting tube from irradiating the photosensitive sensor. A second light-emitting tube is further installed in the maze, and emitted light of the second light-emitting tube penetrates through light inlets formed by the light barriers on the two sides of the photosensitive sensor and directly irradiates the photosensitive sensor. According to the photoelectric fire smoke alarm, the smoke concentration can be measured by additionally arranging the unit for measuring the smoke concentration, so that the interference of the maze on smoke detection output signals can be eliminated or partially compensated, and the detection precision of the photoelectric fire smoke alarm is improved.

Description

technical field [0001] The invention relates to the technical field of smoke alarms, in particular to a photoelectric fire smoke alarm and a method for compensating smoke detection deviations thereof. Background technique [0002] Fire alarms are an important part of the fire protection field, and photoelectric fire smoke alarms are the mainstream of the market. The photoelectric fire smoke alarm is designed based on the principle of light scattering by smoke particles. At present, the photoelectric detection circuits of photoelectric fire alarms are all covered in photoelectric mazes. The functions of mazes are generally to isolate ambient light, prevent insects and prevent dust. Mazes are indispensable in terms of current technology. Although in terms of structural design, the light emitted by the LED does not directly hit the smoke detection photosensitive element, but can only be received by the smoke detection photosensitive element through the scattering of smoke part...

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Problems solved by technology

But the maze itself also reflects light. The light emitted by the LED passes through one reflection or multiple emission inside the maze, and a certain proportion of the light will hit the smoke detection photosensitive element, and then the smoke detection circuit will reflect this part from the maze. The signal to the photoelectric sensor is "wrongly" processed as scattered by smoke, which interferes with the detection of smoke

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