Patent · US Expired

Temperature measuring apparatus

US4568201A · kind A · utility

17Cited by
8References
4Claims
0Family size

Assignee

Inventor

Key dates

Filing dateJun 9, 1983
Grant dateFeb 4, 1986
Priority date
Expiry dateJun 9, 2003

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01J5/0805
  • WIPO fieldElectrical machinery, apparatus, energy
  • WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.