| 摘要 |
PROBLEM TO BE SOLVED: To suitably suppress the temperature rise of an optical filter to improve the accuracy in temperature measurement of a heated material, in a temperature measurement instrument which measures the temperature of the heated material without contacting by detecting the intensity of infrared light in a specific wavelength range, which is emitted from the heated material and is transmitted through the optical filter, by a photodetector.SOLUTION: In an enclosure comprising a tabular stem 55 and a cap 56 like a bottomed cylinder which has a lid part 56a on the front side so as to cover the front side of the stem 55, a heat dissipation part 65 for promoting heat dissipation to the cap 56 from optical filters 51a and 51b which are arranged in filter openings 56b formed in the lid part 56a of the cap 56 and transmit infrared light in a specific wavelength range is provided. |
