Multi-scene smoke detector based on bidirectional blue light detection and self-adaptive identification method

A technology of smoke detector and identification method, which is applied in the direction of fire alarms relying on the effect of smoke/gas, can solve the problems of missed alarms, false alarms, identification, etc., and achieve the effect of improving detection sensitivity

Inactive Publication Date: 2021-08-06
QINGDAO DINGXIN COMM & FIRE FIGHTING SAFETY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, most of the solutions in the industry are one-way infrared. This solution can only judge the size of the semaphore to determine whether a fire has occurred. There is no other reference object, so it is impossible to recognize the scene, and there may be missed or false positives. Happening

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  • Multi-scene smoke detector based on bidirectional blue light detection and self-adaptive identification method
  • Multi-scene smoke detector based on bidirectional blue light detection and self-adaptive identification method
  • Multi-scene smoke detector based on bidirectional blue light detection and self-adaptive identification method

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Embodiment 1

[0044] Such as figure 1 As shown, the multi-scene smoke detector adaptive recognition method based on two-way blue light detection of the present invention includes the following steps:

[0045] S1: The fire detector converts the detected aerosol concentration into an electrical signal;

[0046] S2: The voltage signal is amplified, filtered and A / D converted through the signal processing circuit;

[0047] S3: The digital signal obtained by A / D conversion is analyzed in the microprocessor to realize signal feature extraction, analysis and recognition, and finally judge the scene and judge whether an alarm is required;

[0048] S4: By processing the data collected by the microprocessor, output feature maps of different scenes.

[0049] Preferably, in S1, two blue light emitting tubes placed at different positions in the detector are used to emit light, and when the light encounters the aerosol, it scatters to the receiving tube, and the receiving tube converts the light signal...

Embodiment 2

[0073] At present, the smoke detectors in the fire alarm system industry are generally of the one-way infrared type. This kind of detector cannot classify the smoke, that is, black smoke and white smoke, which makes it extremely sensitive to white smoke and insensitive to black smoke, resulting in black smoke. The smoke response is relatively slow. This kind of detector sets the threshold to low false alarm for white smoke. If the sensitivity is increased, the response to black smoke will be very slow, and the early alarm function will be lost. To improve the sensitivity of black smoke, set the threshold to If it is low, it is easy to generate false positives and cause losses to the society. It is also impossible to distinguish dust, water vapor, and electromagnetics, and then false alarms occur, causing social losses.

[0074] In the automatic fire alarm system, the present invention solves the technical problem that the general smoke detector cannot identify black and white ...

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Abstract

The invention relates to a multi-scene smoke detector based on bidirectional blue light detection and a self-adaptive identification method, which belong to the technical field of fire-fighting fire alarm systems. The method comprises the following steps: S1 a fire detector converts the detected aerosol concentration into an electric signal; S2 amplification filtering and A / D conversion are carried out on the voltage signal through a signal processing circuit; and S3 a digital signal obtained through A / D conversion is analyzed in a microprocessor, signal feature extraction, analysis and identification are achieved, a scene is finally judged, and whether an alarm needs to be given or not is judged. The multi-scene smoke detector comprises two blue light emitting diodes and a blue light receiving tube, and the two blue light emitting diodes and the blue light receiving tube form 70 degrees and 135 degrees in space respectively to form forward scattering and backward scattering; real-time identification, scene judgment and threshold adjustment of fire data can be realized through a bidirectional blue light technology, and a foundation is laid for practical application of fire detection.

Description

technical field [0001] The invention relates to a multi-scene smoke detector based on bidirectional blue light detection and an adaptive identification method, belonging to the technical field of fire alarm systems. Background technique [0002] In the event of a fire, smoke will be generated in most places. By measuring the fire reference quantity of smoke, a comprehensive analysis can determine whether a fire has occurred in the measured area. However, there may be interference factors in the measured area, such as dust, water vapor, and electromagnetic interference factors in the area. If these non-fire factors cannot be identified, the detector is prone to false alarms and incorrect information feedback. Scene adaptation mainly includes signal detection and recognition. Signal detection is to generate optical signals through two blue light tubes distributed in different positions, and the receiving tube receives the optical signals and converts them into current signals...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B17/10
CPCG08B17/10
Inventor 不公告发明人
Owner QINGDAO DINGXIN COMM & FIRE FIGHTING SAFETY CO LTD
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