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<p>Calibrating temperature sensors in a climatic chamber is a common method to ensure accurate temperature measurements. This paper presents an experimental study evaluating the effects of a cylindrical subchamber installed within the climate chamber on the uncertainty associated with the calibration of air temperature thermometers. Three types of sensors with a nominal resistance of 100 Ω and thicknesses of 0.5&#xa0;mm, 3&#xa0;mm, and 6&#xa0;mm, with/without the subchamber having air holes, were used; the stability of each thermometer was measured from -40&#xa0;°C to 60&#xa0;°C. The thermometer’s transient stability improved significantly below 0&#xa0;°C when a cap with air holes was used, thereby controlling heat transfer within the cap. This effect was most dramatic with the smallest-diameter thermometer, which showed the fastest response. The expanded uncertainties below 0&#xa0;°C were improved by introducing a subchamber, about 5 times better for a 0.5&#xa0;mm diameter sensor. The airflow pattern surrounding the sensor had no distinct effect on the measured temperature stability above 20&#xa0;°C, due to the chamber’s enhanced control accuracy. The sealed cap design, without air holes, provided similar or slightly better thermal stability to the holed cap style, but the stabilization time was much longer. In conclusion, measurement uncertainty could be considerably reduced by appropriately controlling the airflow surrounding the thermometer in the chamber, even under conditions of poor temperature stability.</p>

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Effects of a Cylindrical Subchamber on the Calibration Uncertainty of the Thermometer in the Climate Chamber

  • 期刊论文

  • 发表日期：

    2026年4月4日

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  • Yong-Gyoo Kim,
  • Suyong Kwon,
  • Sunghun Kim

摘要

Calibrating temperature sensors in a climatic chamber is a common method to ensure accurate temperature measurements. This paper presents an experimental study evaluating the effects of a cylindrical subchamber installed within the climate chamber on the uncertainty associated with the calibration of air temperature thermometers. Three types of sensors with a nominal resistance of 100 Ω and thicknesses of 0.5 mm, 3 mm, and 6 mm, with/without the subchamber having air holes, were used; the stability of each thermometer was measured from -40 °C to 60 °C. The thermometer’s transient stability improved significantly below 0 °C when a cap with air holes was used, thereby controlling heat transfer within the cap. This effect was most dramatic with the smallest-diameter thermometer, which showed the fastest response. The expanded uncertainties below 0 °C were improved by introducing a subchamber, about 5 times better for a 0.5 mm diameter sensor. The airflow pattern surrounding the sensor had no distinct effect on the measured temperature stability above 20 °C, due to the chamber’s enhanced control accuracy. The sealed cap design, without air holes, provided similar or slightly better thermal stability to the holed cap style, but the stabilization time was much longer. In conclusion, measurement uncertainty could be considerably reduced by appropriately controlling the airflow surrounding the thermometer in the chamber, even under conditions of poor temperature stability.