An anti-interference photoelectric smoke detection method and detection module

Abstract

The invention relates to an anti-interference photoelectric smoke detection method and a detection module, constructing a cooperative sampling detection circuit and controller, closing the sampling end to obtain the initial input value W 0 , turn on the sampling port to obtain the initial value W 1 , if there is a jump in the input value, then it is confirmed that there are refractable particles, and the periodic sampling value W is obtained i , make a difference on the input value sequence A to obtain the difference sequence A', extract features and classify A and A' respectively, trigger an alarm according to the output result or continue to perform periodic sampling until the alarm threshold is reached. The present invention performs accumulative deviation sampling for the environmental transformation of drift and dust accumulation, and processes the signal with an operational integral op amp, and then collects it by a processor to eliminate drift and environmental influence, and reduce false alarms in the smoke detection process; when it cannot be cleaned frequently And in the case of changing the maze, it can effectively avoid the maze failure caused by the accumulation of smoke and dust in the maze or the aging of the maze and devices, reduce the false alarm rate or false alarm rate, and improve the adaptability to the environment.

Description

technical field [0001] The invention relates to the technical field of testing or analyzing materials by using optical means, that is, using infrared light, visible light or ultraviolet light, and particularly relates to an anti-interference photoelectric smoke detection method and a detection module. Background technique [0002] Smoke detectors are also known as smoke fire detectors, smoke detectors, smoke detectors, smoke detectors and smoke sensors, and are mainly used in fire protection systems. At present, most of the smoke detectors on the market use relatively cheap and reliable photoelectric receivers, also known as photoelectric mazes, which are generally equipped with two paired infrared light-emitting diodes (LEDs). The included angle is opposite to each other. In the case of no smoke particles entering the maze, the infrared light emitted by the transmitting tube will not be received by the receiving tube, and the receiving tube will not generate current. Once s...

AI Technical Summary

Problems solved by technology

[0007] The present invention solves the problems existing in the prior art, and provides an optimized anti-interference photoelectric smoke detection method and detection module, aiming at the high error existing in the current photoelectric detector and being easily affected by the environment, etc., by combining detection with signal processing, Reduce the false alarm rate of smoke detection

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