To provide an infrared sensor capable of stably measuring the temperature of an object to be heated, by detecting abnormal output of the infrared sensor due to stains of the window material of the infrared sensor.
The infrared sensor 100 is provided with a housing 2, having an infrared optical path to which an infrared-transmitting window material 6 is attached, infrared-light receiving elements 10 in a prescribed number, arranged in the housing 2 in such a manner that a light-receiving surface faces the infrared-transmitting window material 6 and having a received infrared wavelength region which is different from each other, and an infrared light source 12, disposed in the housing 2 in such a manner that an infrared irradiating surface faces the infrared-transmitting window material.
COPYRIGHT: (C)2009,JPO&INPIT
Kenichiro Takahashi
Akira Miyato
OSAKA GAS CO.,LTD.
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| US6265712 |