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Simulating Error Due to Acquired Thermoelectric Inhomogeneity.

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A new thermocouple design, the thermocouple with controlled temperature field (TCTF), significantly reduces errors caused by inhomogeneity. This advanced thermocouple design minimizes temperature field variations, ensuring more accurate measurements compared to conventional types.

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temperature measurement errorthermocouplethermocouple with controlled temperature fieldthermoelectric inhomogeneity

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Area of Science:

  • Thermocouple technology
  • Temperature measurement
  • Materials science

Background:

  • Thermocouples are susceptible to errors from material inhomogeneity.
  • Conventional thermocouple designs struggle with maintaining stable temperature fields.
  • Inhomogeneity-induced errors can significantly impact measurement accuracy.

Purpose of the Study:

  • To introduce and evaluate a novel thermocouple design for mitigating inhomogeneity errors.
  • To mathematically model and analyze the performance of the thermocouple with controlled temperature field (TCTF) against conventional types.
  • To quantify the residual errors in TCTF under varying temperature field conditions.

Main Methods:

  • Development of a thermocouple with controlled temperature field (TCTF) utilizing an auxiliary furnace.
  • Construction of mathematical models to fit experimental data for type K thermocouples.
  • Simulation and analysis of TCTF and conventional type K thermocouples under significant temperature field changes.

Main Results:

  • The TCTF design effectively stabilizes the temperature field along the thermocouple legs.
  • Mathematical models accurately predicted errors due to inhomogeneity for both TCTF and conventional thermocouples.
  • At temperature field changes exceeding 7 °C, TCTF exhibits significantly lower inhomogeneity errors than conventional thermocouples.

Conclusions:

  • The TCTF represents a superior method for preventing errors due to thermocouple inhomogeneity.
  • Conventional type K thermocouples can exhibit maximum inhomogeneity errors up to 10.75 °C.
  • The TCTF design limits maximum inhomogeneity errors to below 0.2 °C, demonstrating its high accuracy.