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Evaluating the Inhomogeneity of Thermocouples Using a Pressure-Controlled Water Heat Pipe

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Abstract

There exists various research reports concerning the evaluation methods for the measurement uncertainty due to inhomogeneity of thermocouples; however, the universal method is still waiting to be established. This article considers the evaluation methods for the measurement uncertainty due to inhomogeneity of thermocouples based on comparison between results of two measurement methods. The first method is to estimate the uncertainty from the immersion characteristics of a thermocouple within a fixed-point furnace during its realization. The second method is to estimate the uncertainty from the immersion characteristics of a thermocouple within a heat-pipe furnace with a long uniform region. A pressure-controlled water heat-pipe furnace with an immersion depth of 1000 mm is developed to enable this work. It overcomes the technical difficulties that existed in applying conventional sealed heat pipes to such applications. From the immersion characteristics of a thermocouple measured by the above two methods, we have introduced three measurement parameters. Estimating the measurement uncertainty due to the inhomogeneity from our measurement results as examples is discussed.

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Authors and Affiliations

  1. National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (NMIJ, AIST), Tsukuba, Japan

    J. Tamba, K. Yamazawa, S. Masuyama, H. Ogura & M. Izuchi

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  1. J. Tamba
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  2. K. Yamazawa
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  3. S. Masuyama
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  4. H. Ogura
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  5. M. Izuchi
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Correspondence to J. Tamba.

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Tamba, J., Yamazawa, K., Masuyama, S. et al. Evaluating the Inhomogeneity of Thermocouples Using a Pressure-Controlled Water Heat Pipe. Int J Thermophys 32, 2436–2451 (2011). https://doi.org/10.1007/s10765-011-1084-x

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  • DOI: https://doi.org/10.1007/s10765-011-1084-x

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