Patent ID: 7581880

Claim:
A radiant-temperature measurement device, comprising: a first measurement unit for measuring, from among light-source light emitted from a light source having light-emitting ends in which a pattern of variation in light intensity versus time is repeated at predetermined periods each including a first intensity duration and a second intensity duration during which the second intensity differs from the first intensity, an intensity of first light originating in the light-source light; a second measurement unit for measuring an intensity of second light, in which stray light originating in the light-source light is superimposed onto thermal radiation emitted from one of the light-source's light-emitting ends, in each of a first wavelength band and a second wavelength band, whose wavelengths differ from each other; a time-based data measurement unit for acquiring, based on the intensity of the first light measured by the first measurement unit, a first data value during a first measuring interval in the first intensity duration, and a second data value during a second measuring interval in the second intensity duration, and for acquiring, based on the intensity of the second light measured by the second measurement unit, a third data value in the first wavelength band, and a fourth data value in the second wavelength band, during the first measuring interval, and a fifth data value in the first wavelength band, and a sixth data value in the second wavelength band, during the second measuring interval; and a temperature calculation unit for calculating, based on the first, second, third, fourth, fifth, and sixth data values, the temperature of the light source at its light-emitting end.