Flame detection device
AssigneeHochiki Corporation
InventorsHidenari Matsukuma, Masahiko Nemoto, Hiroshi Shima
Life of this patent
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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.
Claims16
A flame detection device for detecting a flame caused by a fire, comprising:
- a light attenuation filter for attenuating 90% or greater of light with wavelengths in a visible to near-infrared band radiated from said flame;
- an imager for photographing an image of said attenuated light incident thereon;
- and
- a processing section for determining said flame from said image obtained by said imager.
A flame detection device for detecting a flame caused by a fire, comprising:
- an infrared bandpass filter for attenuating 90% or greater of light with wavelengths in an infrared band radiated from said flame;
- an infrared imager for photographing an image of said attenuated light incident thereon;
- and
- a processing section for determining said flame from said image obtained by said infrared imager.
A flame detection device for detecting a flame caused by a fire, comprising:
- a light attenuation filter for attenuating 90% or greater of light with wavelengths in a visible to near-infrared band radiated from said flame;
- an imager for photographing an image of said attenuated light incident thereon;
- a specific-wavelength transmitting filter for transmitting light with wavelengths in a CO2 resonance radiation band;
- an infrared sensor for receiving said light transmitted through said specific-wavelength transmitting filter, and converting the received light into an electrical signal;
- and
- a processing section for determining said flame from changes in the temporal enlargement and reduction of said image obtained by said imager, and from a flicker frequency obtained from said electrical signal output by said infrared sensor.
A flame detection device for detecting a flame caused by a fire, comprising:
- a light attenuation filter for attenuating 90% or greater of light with wavelengths in a visible to near-infrared band radiated from said flame;
- an imager for photographing an image of said attenuated light incident thereon;
- a first infrared sensor provided with a first specific-wavelength transmitting filter which transmits light with a first wavelength lower than the center wavelength of a CO2 resonance radiation band, said first infrared sensor being operative to receive said light transmitted through said first specific-wavelength transmitting filter and convert the received light into an electrical signal;
- a second infrared sensor provided with a second specific-wavelength transmitting filter which transmits light with a second wavelength which is the center wavelength of said CO2 resonance radiation band, said second infrared sensor being operative to receive said light transmitted through said second specific-wavelength transmitting filter and covert the received light into an electrical signal;
- a third infrared sensor provided with a third specific-wavelength transmitting filter which transmits light with a third wavelength higher than said second wavelength;
- said third infrared sensor being operative to receive said light transmitted through said third specific-wavelength transmitting filter and convert the received light into an electrical signal;
- and
- a processing section for determining said flame from changes in the temporal enlargement and reduction of said image obtained by said imager, and from a distribution of peaks obtained from said electrical signals output by said first, second, and third infrared sensors.
Dependencies are inferred from the claim text.