【摘要】 本文介绍采用锥腔补偿型电校准辐射计复现发光强度单位的实验装置、方法和结果。分析了各项误差,得到的总的不确定度为±0.28％。更多还原

【Abstract】 This paper describes the system, method and results in the experiment for the realization of candela, the basic unit for photometry, with the electrically calibrated radiometer according to the new definition. The primary standard group consists of seven stable radiometers, and the difference between the measured value of irradiance for each radiometer and their mean value is less than ?.1%. The reflectance, thermal-resistance of black coating and heat sink in the cone cavity of the radiometer has been measured precisely. By the principle of subtraction combination, two sets of V(λ) filters with high performance are established, and their spectral transmittances are measured using a double monochrometer. The secondary standard lamp group for luminous intensity at 2856K consists of BDQ8 and BDQ7 gas-filled tungsten-filament lamps with the stability of ±0.05%. The total uncertainty for the realization of the luminous intensity unit with the electrically calibrated radiometer is ±0.28%.更多还原