Point-shaped light scattering type smoke detector without optical labyrinth, and signal processing method

Abstract

The invention discloses a point-shaped light scattering type smoke detector without an optical labyrinth, and a signal processing method. The point-shaped light scattering type smoke detector without the optical labyrinth comprises a photoelectric smoke detection part, a detection chamber (C), a filter screen (I), a signal processing unit (E), a housing (F), an alarm horn (G) and an indication lamp (H). According to the novel idea of the point-shaped light scattering type smoke detector without the optical labyrinth disclosed by the invention, the obstructions of smoke grains entering and exiting the detector are reduced, thus the flowing of smoke entering and exiting the chamber is smooth, and high response sensitivity and real-time performance are achieved. The function of the optical labyrinth structure is preventing an external environment light from entering the detection chamber, for this, the invention discloses a analysis and processing method for a signal containing functions of an environment light, a smoke and the like by virtue of an amplitude modulation and demodulation principle, provides an theoretical basis for the point-shaped light scattering type smoke detector without the labyrinth, and also provides a novel thought and research direction for research on improvement for the response sensitivity of the detector.

Description

technical field [0001] The invention belongs to the technical field of point-type light-scattering smoke detection and fire detection, relates to a point-type light-scattering smoke detector without an optical labyrinth, and also relates to a point-type light-scattering smoke detector without a labyrinth using the principle of amplitude modulation and demodulation. The method for analyzing and processing the signal in the detector. Background technique [0002] Smoke particles are one of the most important characteristic parameters in the early stage of a fire. The point-type light scattering smoke detector is the fire detector with the largest output and the most widely used in the field of automatic fire detection and alarm, and plays an important role in building fire prevention at home and abroad. However, this kind of fire detector obviously has problems such as long detection response time and low sensitivity. Therefore, improving the response performance of the point ...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a new idea of ​​a point-type light-scattering smoke detector without an optical labyrinth, and provide a new method for processing the signal in this smoke detector to obtain the smoke concentration, so as to solve the problem of existing point-type photoelectric The optical labyrinth in the smoke detector causes problems such as slow speed of fire smoke particles entering and leaving the detection cavity, long detection response time, poor real-time performance, and low sensitivity. Research and develop a new type of point-type photoelectric smoke fire detector

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