Infrared multiparameter fire and gas detector

A detector and multi-parameter technology, applied in electrical radiation detectors, fire alarms that rely on radiation effects, etc., can solve the problems of timely and accurate detection results of fire detectors that are not ideal, rapid fire development, and fire damage losses. , to achieve the effect of increasing multi-information and predictive functions, strong detection adaptability, and early warning

Inactive Publication Date: 2012-04-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2) When the temperature is higher, the temperature of combustibles will rise accordingly, and the temperature difference with the ignition point will be smaller, making it easier to be ignited, causing the fire to develop rapidly;
[0005] 3) The fire is changeable, often irregular combustion, the fire is difficult to control, the water consumption is large, the difficulty of fighting is high, and it often forms three-dimensional, multi-layered combustion, and the fire hazard and loss are more ser

Method used

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  • Infrared multiparameter fire and gas detector
  • Infrared multiparameter fire and gas detector
  • Infrared multiparameter fire and gas detector

Examples

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Embodiment 1

[0030] see figure 1, an infrared multi-parameter fire and gas detector, comprising a housing and an optical window assembly installed in its internal cavity, a detector element array 12, a fire alarm indicator light 9 and a main control circuit board 10, and the detector element array 12 is Composite fire detector, the main control circuit board 10 includes a signal board and a power board, the signal board includes a processor and a processor peripheral circuit, the signal output end of the detector element array 12 is connected with the processor peripheral circuit through an amplification and an analog-to-digital conversion module The signal input end signal connection of the processor peripheral circuit is connected with the signal input end signal of the fire alarm indicator light 9, and the power board controls power supply to the processor, the detector element array 12 and the fire alarm indicator light 9. The housing is formed by the sealing connection of the housing ...

Embodiment 2

[0034] The technical solution of this embodiment is basically the same as that of Embodiment 1, the difference is that:

[0035] In this embodiment, the detector element array 12 also includes a lead sulfide temperature detector with a central wavelength of 2.7um, which detects the temperature of the target in the field of view and the radiation information of the second intensity of the flame, providing fire detection and eliminating interference. Auxiliary judgment information. When hydrocarbons burn, there is a peak near 2.7 μm and 4.3 μm in the infrared band, and the sun’s radiation near these two bands is absorbed by CO2 in the air, so use the central band with a narrow band filter at 2.7 The lead sulfide temperature detector and its sensor near μm and the pyroelectric sensor with the center band near 4.3μm are used as the flame detection sensor. The 2.7μm lead sulfide detector has high sensitivity to the flame signal, and is used to monitor the trend of flame intensity,...

Embodiment 3

[0037] The technical solutions of this embodiment are basically the same as those of Embodiment 1 and Embodiment 2, except that:

[0038] see figure 2 , in this embodiment, a programmable gain amplifier is added between the signal output end of the detector element array 12 and the signal input end of the processor peripheral circuit. The programmable gain amplifier has an adjustable gain bandpass filter amplifying circuit, and the Multiple automatic adjustment control to reduce fire misjudgment caused by signal saturation. exist figure 2 Among them, the pyroelectric detector elements of three bands of 4.3um, 3.8um, and 5.0um and the 2.7umPbS temperature detector element filter and amplify the detected signal through a band-pass filter amplifier circuit and input it to the analog-to-digital conversion of the processor The module is converted into a digital signal for processing, and the programmable gain control in the processor adjusts the magnification. When the signal i...

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Abstract

The invention discloses an infrared multiparameter fire and gas detector which comprises a shell and an optical window assembly, a detector element array, a fire alarm indicator light and a main control circuit board installed inside a cavity of the shell, wherein the detector element array is a composite fire detector; the optical window assembly comprises an optical lens and a fastening and locating assembly thereof, and the fastening and locating assembly is used for fastening and locating the optical lens in an elastic soft touch manner; and the detector element array at least comprises three pyroelectric detectors with center wavelengths of 3.8 mum, 4.3 mum and 5.0 mum respectively. A plurality of pyroelectric detectors with different bands are used for detecting flames and environment background signals, a signal collected by an intelligent infrared CO/CO2 gas detector is combined, a temperature signal detected by lead sulfide can also be used as an aid, the fusion of information from multiple sensors is realized, and the purposes of alarming in advance and reducing false alarms are better reached. The fire and gas detector provided by the invention has compact structure, small size, high reliability and high sensitivity to early fire detection and is not influenced by sunlight and visible light, and the total design conforms to the explosion proof requirements in national standards.

Description

technical field [0001] The invention relates to a fire detection tool, in particular to a composite parameter fire detector, which can be used for timely and accurate detection of various fire conditions in various fire situations. Background technique [0002] Compared with indoor fires, wildfires have their unique characteristics: [0003] 1) Limited by space, it is completely exposed when burning, with sufficient oxygen supply, fast air convection, fast fire spread and large burning area; [0004] 2) When the temperature is higher, the temperature of combustibles will rise accordingly, and the temperature difference with the ignition point will be smaller, making it easier to be ignited, causing the fire to develop rapidly; [0005] 3) The fire is changeable, often irregular combustion, difficult to control the fire, large water consumption, difficult to fight, and often form three-dimensional, multi-layered combustion, fire hazards and losses are more serious. [0006]...

Claims

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Application Information

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IPC IPC(8): G08B17/12G01J5/10
Inventor 杨帮华丁丽娜李海飞刘燕燕张永怀
Owner SHANGHAI UNIV
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