The APMP bilateral key comparison APMP.T-K3.4 was initiated on the request from RCM-LIPI (Indonesia) to link their national standards to the average reference values (ARVs) of the CCT-K3. Korea Research Institute of Standards and Science (KRISS, Republic of Korea) provided the linkage to the CCT-K3 for temperatures ranging from -38.8344 °C to 419.527 °C. In the APMP.T-K3.4, two standard platinum resistance thermometers (SPRTs) were chosen as the transfer instruments and were calibrated at the ITS-90 fixed-points in the comparison range. The fixed-points in this comparison included Zn freezing point (419.527 °C), Sn freezing point (231.928 °C), In freezing point (156.5985 °C), Ga melting point (29.7646 °C), and Hg triple point (-38.8344 °C). The comparison was carried out in a participant-pilot-participant sequence where KRISS served as the pilot. The linkage was based on the fixed-point resistance ratios of RCM-LIPI relative to the ARVs of the CCT-K3 via the difference between the fixed-point resistance ratios of KRISS and the ARVs of the CCT-K3. The temperature differences between the national standards of RCM-LIPI and the ARVs of the CCT-K3 were within the evaluated comparison uncertainties of the ATPM.T-K3.4. This report provides detailed information on the comparison results, linkage mechanism, and the Degree of Equivalence of the RCM-LIPI relative to the institutes having participated in the CCT-K3.
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To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.
The final report has been peer-reviewed and approved for publication by the CCT, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
Spectral radiance responsivity calibration of Fourier transform spectrometers (FTSs) used for solar radiance observations is important for removing systematic errors resulting from the different spectral responsivities of each instrument. In this study, the spectral responsivity of an FTS with a Globar lamp as an internal light source was calibrated, and its temperatures were determined without direct temperature measurement through nonlinear fitting using a modified three-temperature method (referred to hereafter as m-TTM). Our calibration results were verified using a standard tungsten strip lamp. Furthermore, the spectral radiance results obtained with three different apertures proved that the FTS radiance has a systematic error of approximately 5%, deviating from that of the standard strip lamp owing to an assumption of a perfect emissivity. In particular, the real emissivity of the Globar lamp, for which the value still includes an instrumental optical error, in the range of 4000 cm −1 to 8000 cm −1 (for the InSb detector) was found to be approximately 0.94-0.98 after correction by a supplementary measurement using a certified standard strip lamp as an external light source. The deviations of the results for all the apertures were less than ±1%. Therefore, this study showed that the accurate responsivity calibration of an FTS with an internal light source such as a Globar lamp could be obtained by employing the m-TTM.
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