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In precision optical radiometric and photometric measurements, one of the limiting factors is an accurate knowledge of the area of a beam limiting aperture. The world's most accurate radiometric measurements are currently realized with a relative standard uncertainty of order 10<sup>&#x2212;4</sup>. To achieve this level of accuracy it is essential to(More)
The thermodynamic temperature of the point of inflection of the melting transition of Re-C, Pt-C and Co-C eutectics has been determined to be 2747.84 ± 0.35 K, 2011.43 ± 0.18 K and 1597.39 ± 0.13 K, respectively, and the thermodynamic temperature of the freezing transition of Cu has been determined to be 1357.80 ± 0.08 K, where the ± symbol represents 95%(More)
The international metrological community is involved in an ongoing series of comparisons of measurement standards. The calculation of differences from a “reference value”, some form of weighted mean of the results, has been recommended as a convenient figure of merit for participating laboratories. In temperature metrology, the uncertainties of the defining(More)
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