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Flame detector

A flame detection and flame technology, which is used in fire alarms, electrical radiation detectors, and fire alarms that rely on radiation. question

Inactive Publication Date: 2008-05-14
HOCHIKI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, CCD imagers cannot capture the spatial characteristics of flames and are therefore not suitable for detecting and monitoring flames

Method used

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Embodiment Construction

[0027] The preferred embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] Referring now to FIG. 1, there is depicted a flame detection apparatus constructed in accordance with a first embodiment of the present invention. The flame detection device of the first embodiment is characterized by the use of a CCD imager. The flame detection device includes an entrance window 10 , a neutral density (ND) filter 12 , and a visible light cut filter 14 . In order to protect against dust, dew and the like, the entrance window 10 is made of sapphire glass. The ND filter 12 includes a light attenuating filter that attenuates 90% or more of the light emitted from the monitoring area.

[0029]We know that the ND filter 12 is a light-attenuating filter with a wavelength range between visible light and near-infrared light, and has a transmission coefficient (0-1) as shown in FIG. 2 , for example. Since the ND filter 12 ...

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Abstract

A flame detection device for detecting a flame caused by a fire, including a light attenuation filter for attenuating 90% or greater of light with wavelengths in a visible to near-infrared band radiated from the flame. The flame detection device further includes an imager for photographing an image of the attenuated light incident thereon, and a processing section for deciding the flame from the image obtained by the imager.

Description

technical field [0001] The present invention generally relates to a flame detection device, and more particularly to a flame detection device for judging a flame from a flame image obtained by photographing a monitoring target with an imager. Background technique [0002] As a prior art method of processing images captured by surveillance cameras and judging flames caused by misfires, (1) a method of extracting infrared rays in the CO2 resonant radiation band including wavelengths characteristic of light emitted by flames is well known , (2) a method for inferring the flicker frequency of a flame as a temporal change in the intensity of infrared light in the CO2 resonant radiation band, and (3) a method for inferring the temporal expansion and contraction of detection results method, this expansion and contraction in time is a spatial property of the image of a burning flame. Therefore, the flame detection device for image processing in the prior art is equipped with an inl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/10G08B17/103G08B17/12
CPCG08B17/12
Inventor 松熊秀成根本雅彦岛裕史
Owner HOCHIKI CORP