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Heat source detection device and heat source detection method

  • US 10,145,741 B2
  • Filed: 05/31/2017
  • Issued: 12/04/2018
  • Est. Priority Date: 07/27/2016
  • Status: Active Grant
First Claim
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1. A heat source detection device comprising:

  • an infrared sensor configured to detect infrared radiation across a first infrared wavelength band and a second infrared wavelength band that is different from the first infrared wavelength band;

    a memory configured to store first conversion information representing a relationship between a first output output from the infrared sensor in accordance with an incident amount of the infrared radiation across the first infrared wavelength band detected by the infrared sensor and a temperature, second conversion information representing a relationship between a second output from the infrared sensor in accordance with an incident amount of the infrared radiation across the second infrared wavelength band detected by the infrared sensor and a temperature, and third conversion information representing a relationship between a ratio between the first and second outputs and a temperature; and

    a processor configured to detect a heat source based on the first and second outputs output from the infrared sensor, the first conversion information, the second conversion information and the third conversion information stored in the memory, whereina process performed by the processor to detect the heat source includescalculating, as a single-wavelength temperature, one of a first temperature obtained by converting the first output output from the infrared sensor into a temperature, a second temperature obtained by converting the second output output from the infrared sensor together with the first output into a temperature and an average value of the first and second temperatures, and calculating a dual-wavelength temperature obtained by converting the ratio between the first and second outputs into a temperature, anddetermining a temperature of the heat source based on the dual-wavelength temperature and determining a distance to the heat source from the infrared sensor based on a value indicating one of a temperature difference and a temperature ratio, the temperature difference being a difference between the single-wavelength temperature and the dual-wavelength temperature, the temperature ratio being a ratio between the single-wavelength temperature and the dual-wavelength temperature.

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