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US 11,029,201 B2Granted
Abnormality detector
AssigneeFukada Kogyo Co., Ltd.
InventorsRyo Ishikawa, Takeshi Takashima, Kenji Kido, Masanori Hirasawa, Yuichiro Hanai
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Abstract
The disclosure provides respective detection devices of a sensor array that detect infrared light and convert the infrared light into a DC component electrical signal.
Claims19
An abnormality detector comprising:
- a plurality of band filters including:
- a first band filter configured to allow passage of infrared light in a first band including a peak wavelength of a carbon dioxide gas resonance radiation band,
- a second band filter configured to allow passage of infrared light in a second band that is different from the first band, and that has a band center positioned away from a band center of the carbon dioxide gas resonance radiation band, and
- a third band filter configured to allow passage of infrared light in a third band that is different from both the first band and the second band, and that has a band center positioned away from the band center of the carbon dioxide gas resonance radiation band;
- a detection section including:
- a first sensor array arrayed in a two-dimensional pattern and having first detection devices each configured to detect infrared light that has passed through the first band filter and convert the infrared light into an electrical signal,
- a second sensor array arrayed in a two-dimensional pattern and having second detection devices each configured to detect infrared light that has passed through the second band filter and convert the infrared light into an electrical signal, and
- a third sensor array arrayed in a two-dimensional pattern and having third detection devices each configured to detect infrared light that has passed through the third band filter and convert the infrared light into an electrical signal,
- the respective first detection devices of the first sensor array being disposed so as to correspond to the respective second detection devices of the second sensor array and the respective third detection devices of the third sensor array;
- and
- a determination section configured to determine, for each of the detection devices, whether a flame or an abnormal temperature has been detected based on any combination of electrical signal values among an electrical signal value detected by a corresponding detection device from out of the first detection devices, an electrical signal value detected by the corresponding second detection device, or an electrical signal value detected by the corresponding third detection device, and also to determine a predetermined position of a detection device determined to have detected a flame or an abnormal temperature as being a position where the flame or the abnormal temperature has been detected.
8 more elements
An abnormality detector comprising:
- a plurality of band filters including:
- a first band filter configured to allow passage of infrared light in a first band including a peak wavelength of a carbon dioxide gas resonance radiation band,
- a second band filter configured to allow passage of infrared light in a second band that is different from the first band, and that has a band center positioned away from a band center of the carbon dioxide gas resonance radiation band, and
- a third band filter configured to allow passage of infrared light in a third band that is different from both the first band and the second band, and that has a band center positioned away from the band center of the carbon dioxide gas resonance radiation band;
- a detection section including detection devices respectively provided to each of the plurality of band filters and configured to detect infrared light that has passed through the corresponding band filter and convert the infrared light into an electrical signal, a detection device provided at at least one of the plurality of band filters comprising a sensor array arrayed in a two-dimensional pattern;
- a determination section configured to determine whether a flame or an abnormal temperature has been detected, based on values of the electrical signals detected by the respective detection devices of the detection section;
- an average computation section configured to compute an average value of the electrical signal detected by the detection device for each of the detection devices;
- and
- a change amount computation section configured to compute, for each of the detection devices, a change amount from the average value of the electrical signal detected by the detection device,
- wherein the determination section is configured to determine whether a flame or an abnormal temperature has been detected by comparing one or more of the change amounts computed by the change amount computation section for the respective detection devices against a determination threshold value.
7 more elements
An abnormality detector comprising:
- a plurality of band filters including:
- a first band filter configured to allow passage of infrared light in a first band including a peak wavelength of a carbon dioxide gas resonance radiation band,
- a second band filter configured to allow passage of infrared light in a second band that is different from the first band, and that has a band center positioned away from a band center of the carbon dioxide gas resonance radiation band,
- a third band filter configured to allow passage of infrared light in a third band that is different from both the first band and the second band, and that has a band center positioned away from the band center of the carbon dioxide gas resonance radiation band, and
- a fourth band filter configured to allow passage of infrared light in a predetermined band;
- a detection section including:
- a first detection device configured to detect infrared light that has passed through the first band filter and convert the infrared light into an electrical signal;
- a second detection device configured to detect infrared light that has passed through the second band filter and convert the infrared light into an electrical signal;
- a third detection device configured to detect infrared light that has passed through the third band filter and convert the infrared light into an electrical signal, and
- a sensor array arrayed in a two-dimensional pattern and having fourth detection devices each configured to detect infrared light that has passed through the fourth band filter and convert the infrared light into an electrical signal;
- and
- a determination section configured to:
- determine whether a flame or an abnormal temperature has been detected based on any combination of electrical signal values among an electrical signal value detected by the first detection device, an electrical signal value detected by the second detection device, or an electrical signal value detected by the third detection device, and
- in a case in which determination has been made that a flame or an abnormal temperature has been detected, to determine a position where the flame or the abnormal temperature has been detected based on electrical signal values detected by the respective fourth detection devices of the sensor array.
11 more elements
Dependencies are inferred from the claim text.