Uncertainty Evaluation on the Freezing Point of Copper for Calibration of Thermocouples

Ogura, H.; Numajiri, Haruhiko; Yamazawa, K.; Tamba, J.; Izuchi, M.; Arai, M.

doi:10.9746/sicetr1965.39.1016

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…Abdelaziz [19] (227 °C) Tamba [18] (Zn, Al, Ag, Cu and Pd) Kim [16] (550 °C, 750 °C and 950 °C) Fenton [11] (70 °C) Hill [15] (250 °C) White d [20] (100 °C) Holmsten [21] (300 °C) Ogura [22] (Cu)…”

Section: The Double-gradient Scannermentioning

confidence: 99%

Thermocouple homogeneity scanning

Webster

White

2015

Metrologia

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The inhomogeneities within a thermocouple influence the measured temperature and contribute the largest component to uncertainty. Currently there is no accepted best practice for measuring the inhomogeneities or for forecasting their effects on real-world measurements. The aim of this paper is to provide guidance on the design and performance assessment of thermocouple inhomogeneity scanners by characterizing the qualitative performance of the various designs reported in the literature, and developing a quantitative measure of scanner resolution. Numerical simulations incorporating Fourier transforms and convolutions are used to gauge the levels of attenuation and distortion present in single-and double-gradient scanners. Single-gradient scanners are found to be far superior to double-gradient scanners, which are unsuitable for quantitative measurements due to their blindness to inhomogeneities at many spatial frequencies and severe attenuation of signals at other frequencies. It is recommended that the standard deviation of the temperature gradient within the scanner is used as a measure of the scanner resolution and spatial bandwidth. Recommendations for the design of scanners are presented, and include advice on the basic design of scanners, the media employed, operating temperature, scan rates, construction of survey probes, data processing, gradient symmetry, and the spatial resolution required for research and calibration applications.

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Section: The Double-gradient Scannermentioning

confidence: 99%

Thermocouple homogeneity scanning

Webster

White

2015

Metrologia

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“…For radiation thermometers, standard transfer using four fixed points in the range up to 2500°C started in 2008, and the range was extended to 2800°C in 2011. There have also been studies of thermocouple calibration , and experiments with standard transfer at the cobalt–carbon (Co−C) eutectic point (1324°C) were begun in 2009.…”

Section: Introductionmentioning

confidence: 99%

Interlaboratory Comparison of the Co−C Eutectic Point with Small‐Size Cell for Thermocouples

Numajiri

Sasaki

Aikawa³

et al. 2014

Elect Comm in Japan

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SUMMARYUsing a small-size crucible, interlaboratory comparison of the realization of the Co−C eutectic point was performed in the industrial field in Japan, with the aim of verifying the possibility of thermocouple calibration at the eutectic point with an existing furnace of less-thanideal temperature distribution, namely, the palladium-point wire-bridge method furnace for thermocouple calibration.

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優¹,

秀樹²,

正也³

2010

Synthesiology

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Since late 1990's, the reliability of temperature measurements at high temperatures was remarkably upgraded by establishing the national metrology standards for calibration of thermocouples up to 1550 °C, and by implementing the traceability system. The traceability system, structured as a hierarchical link of calibrations between the national metrology standards and practical measurements, was designed in consideration of various elements such as availability of the measurement standards and sharing the responsibility with accredited calibration laboratories. The optimized scheme for industries in Japan was established by promoting a balanced combination of conventional techniques held by accredited calibration laboratories and progressive technology, taking into account the spread of the progressive technology. キーワード：熱電対、計量標準、校正、温度定点、共晶点Keywords：Thermocouple, measurement standard, calibration, temperature fixed point, eutectic point 産業技術総合研究所計測標準研究部門〒 305-8563 つくば市梅園 1-1-1 中央第 3

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Uncertainty Evaluation on the Freezing Point of Copper for Calibration of Thermocouples

Cited by 4 publications

References 3 publications

Thermocouple homogeneity scanning

Thermocouple homogeneity scanning

Interlaboratory Comparison of the Co−C Eutectic Point with Small‐Size Cell for Thermocouples

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