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Backscattering maze

A backscattering and labyrinth technology, applied in the field of smoke detectors, can solve the problems of increased difficulty in circuit part and signal processing design

Inactive Publication Date: 2018-08-17
深圳市高新投三江电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is more difficult to design the circuit part and signal processing, and puts forward higher requirements for the anti-interference ability of the maze

Method used

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Embodiment Construction

[0011] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. Wherein, similar elements in different implementations adopt associated similar element numbers. In the following implementation manners, many details are described for better understanding of the present application. However, those skilled in the art can readily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the application are not shown or described in the description, this is to avoid the core part of the application being overwhelmed by too many descriptions, and for those skilled in the art, it is necessary to describe these operations in detail Relevant operations are not necessary, and they can fully understand the relevant operations according to the description in the specification and genera...

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Abstract

The invention provides a backscattering maze comprising a light shielding wall and a tube seat. The tube base is provided with a transmitting unit and a receiving unit, and the transmitting unit and the receiving unit are symmetrically arranged along the central axis of the tube seat. An angle beta is formed by the central axis of the tube seat and the central axis of the maze, and beta is largerthan 0 degree and is smaller than 90 degrees. The central optical axis of the transmitting unit and the central optical axis of the receiving unit meet on the central axis of the maze. Since a certainangle is formed by the central axis of the tube seat and the central axis of the maze in the invention, light emitted by the transmitting unit can be reflected on the light shielding wall for many times due to the existence of the angle, and the reflected light finally enters into the receiving unit. As the number of reflections increases, the light energy gradually decays, and thus the background value of the maze is reduced. When the background value is reduced, the difference between the background value and a fire alarm value is increased, and the risk of false alarm is reduced.

Description

technical field [0001] The present application relates to a smoke detector, in particular to a backscattering maze applied to a photoelectric smoke detector. Background technique [0002] Scattering smoke detectors mainly have two forms: forward scattering and back scattering. If the angle between the central optical axis of the transmitting unit and the central optical axis of the receiving unit is greater than 90°, it is forward scattering, and if it is less than 90°, it is backward scattering. Among them, the sensitivity of forward scattering is relatively high, but it is not sensitive to black smoke. Backscatter is less sensitive, but sensitive to black smoke. This is mainly determined by the "Mie scattering" characteristic of smoke particles, which is an inherent property of smoke particles when detecting light, so backscattering is more sensitive to black smoke. [0003] When the maze is working, the transmitting unit emits a light beam, which is reflected by the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B17/107G08B29/18
CPCG08B17/107G08B29/18
Inventor 高庆斌郭荣朱卫东
Owner 深圳市高新投三江电子股份有限公司
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