Temperature detecting device, microwave cooking apparatus...

G - Physics – 01 – K

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327/2.51

G01K 7/16 (2006.01) G01J 5/10 (2006.01) G01J 5/62 (2006.01) H05B 6/66 (2006.01) H05B 6/80 (2006.01)

Patent

CA 1268522

ABSTRACT OF THE DISCLOSURE A temperature detecting device detects infrared rays from an object to be measured, and determines the temperature of the object on the detection result. To avoid the influence of contamination adhered on the infrared ray incidence surface of an infrared ray detecting unit, a correction coefficient for the detection result of the infrared ray detecting unit is determined before the cooking starts. The infrared rays fed from the object into the infrared ray detecting unit is interrupted by a shutter device. The infrared ray detecting unit detects the infrared rays fed from the shutter device through the infrared ray incidence surface, and outputs a first detection value corresponding to the shutter temperature. A shutter temperature detecting element directly detects the actual temperature of the shutter device, and outputs a second detection value corresponding to the actual temperature of the shutter device. The correction coefficient is determined by comparing the second detection value from the shutter temperature detecting element with the first detection value from the infrared ray detecting unit.

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