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Uncertainty of Radiation Thermometers Calibrated by Interpolation between Fixed Points
Yoshiro Yamada 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
An interpolation scheme for calibration of radiation thermometers in high-temperature is discussed, which utilizes one metal fixed point and one high-temperature fixed point of metal-carbon systems. The two-fixed-point interpolation scheme can realize smaller uncertainty than conventional schemes which make reference to a single fixed point, or to three or more fixed points. The two-fixed-point interpolation scheme has the advantage that no precise evaluation of the radiation thermometer spectral responsivity functionis required. This reduces the need of a regular re-evaluation of the relative spectral responsivity in the presence of filter drift, or even evaluation of the spectralresponsivity at all if the approximate filter bandwidth is known.
Performance evaluation of WC-C peritectic high-temperature fixed point
Naohiko Sasajima,Yoshiro Yamada 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
WC-C peritectic fixed point (2749 oC) was investigated to evaluate their potential of serving ashigh-temperature reference points in thermometry. Four WC-C peritectic cells were constructed and the melting and freezing plateaus were evaluated by means of radiation thermometer. The repeatability of the melting temperature of onecell was 0.011 K with the melting range of 0.117 K. The melting temperatures of four different cells were agreed within0.05 K. The long term stability of WC-C cell was also evaluated by the realization of 45 melt/freeze cycles. The standard deviation of 45 melting temperatures was 0.034 K including the instability of LP3. From these results, it can be concluded that WC-C peritectic fixed point has a high potential to be used as a high temperature reference point. The microstructure analyses of WC-C peritectic cells by means of optical microscopy and electron-probe microanalysis (EPMA) showed the segregation of the graphite in the WC-C cell.