Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1983-06-09
1986-02-04
Stephan, Steven L.
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
374121, 374120, G01J 500
Patent
active
045682011
ABSTRACT:
An infrared sensor made of LiTaO.sub.3 is provided on a ceiling of a heating chamber of a microwave oven, and a chopper is provided so as to intermittently block infrared radiation emitted from food in the heating chamber. The infrared sensor is brought to face the food and the chopper alternately and provides a corresponding AC output signal. The temperature of the chopper is detected from the output signal of a separately provided chopper temperature sensor consisting of a thermister. The detected chopper temperature output signal is corrected in a microcomputer to be substantially in accord with chopper temperature components in the output signal of the infrared sensor. The corrected chopper temperature data is applied to the infrared sensor output data for removing the chopper temperature components from the output signal of the infrared sensor to obtain a food temperature signal corresponding to the sole temperature of the food.
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Patent Abstracts of Japan, vol. 4, No. 168, Nov. 20, 1980.
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Patent Abstracts of Japan, vol. 2, No. 84, Jul. 8, 1978.
Schuster David R.
Stephan Steven L.
Tokyo Shibaura Denki Kabushiki Kaisha
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