Resolution limits in radiation temperature measurements using unfiltered photodiodes as detectors

摘要

This paper attempts to determine the practical and theoretical resolution limits of black-body (BB) radiation temperature measurements. The calculations were restricted to unfiltered Si, Ge and InSb photodiodes and to the 100℃ to 1500℃ temperature range. A measurement geometry determined by the fixed-point BB construction was used with a view angle of 3° and an observed area of 1 mm~(2). Current best technology for detector long-term noise performance was assumed. The calculations show that the best resolutions are 15 mK to 40 mK for InSb, 6 mK to 15 mK for Ge and 2 mK to 8 mK for Si fullband pyrometers in the temperature ranges 100℃ to 280℃, 280℃ to 500℃ and 500℃ to 1100℃, respectively. These results require very good temperature stabilization (better than 0,01 K) of the detectors.