According to the intensity of the definition for the reproduction of light units, there are two ways to use box: high temperature blackbody radiation source, such as power conversion type radiometer method detection device. Compared with the effect of temperature of blackbody furnace scale precision, power conversion type radiometer problems equivalent incident radiation and power conversion, but due to calcium carbide stored in ultra-low temperature (liquid nitrogen temperature), can achieve good equivalence, therefore the standard institutions of other countries or the use of the latter to the. Japan's Industrial Technology Research Institute, said at the time that the Institute of Electronic Technology (ETL) in 1974, the introduction of ultra low temperature radiometer, light intensity units to become the basis of side light, radiation and other units set. With the use of the ultra low temperature radiometer, a high spectral responsivity is obtained, and a new light intensity and luminous flux. The appearance of the cryogenic radiometer is shown in Figure 1.2. The absolute spectral responsivity of the cryogenic radiometer is taken as the benchmark. The light flow principle of the light intensity and flux unit is shown in figure 1.3. According to the determination of deviation is 0.28% side light intensity (k=1), including the coefficient of error flux is 0.34% (including Fen coefficient = 1)
As the CIPM (CIPM) photometry determination of radiation Advisory Committee (CCPR) part of a benchmark of international comparison organized, from 1997 to 1999 implementation of the light intensity (CCPR - K3a) and flux (CCPR - K4) and the Central Bureau (German Federal Institute of physical optics, PTB) the international comparison of Nissan. Research (Electric Research Institute at the time) in a new benchmark for the light intensity, the luminous flux of international comparison. The 17 agencies involved in 6 institutions with ultra low Ju radiometer as a benchmark, a transfer by numerical standard light source. CCPR sponsored international comparison campaign, which initially led the benchmark international comparison reference value (KCRV). According to the Research Report (ETL) December 1999, the KCRV deviation of the intensity of 0.09%, luminous flux of 0.18 write. The comparison results of each country are shown in Figure 1.4, and the equivalence of the results of the international comparison has been recognized by CCPR, and the results of these comparisons have been recognized. The results of the comparison with the international reflect the benchmark level of Japan, Japan in 2001
The March 15th revision of the standard value of light intensity, time.
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