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Updated: Sep 2, 2025

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
Published on: April 30, 2018
Temperature measurements in the freezing supercooled water droplet by utilizing molecular tagging thermometry
Anning Wei1, Zhigang Yang2, Lei Tang3
1School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China.
Abstract:
In the present study, we report novel methods to achieve accurate temperature measurements inside the water droplet at its supercooled state as well as during its freezing process. The temperature measurements were based on the molecular tagging thermometry technique. In order to maintain the nonfreezing state of the phosphorescent tracer complex aqueous solution at a subfreezing temperature, a double-layer temperature control container was designed and fabricated. Then, the calibration between the lifetime and temperature of the phosphorescent tracer complex aqueous solution from 7.5 °C to as low as -6.0 °C was carefully performed. Then, the ice fraction (f) was applied to revise the calibration curve for the ice-liquid mixture. The results indicated that the calibration curve for the pure liquid was suitable for the temperature measurements of the pure phosphorescent triplex solution at the supercooling state, while the revised calibration curve for the ice-liquid mixture was appropriate for the temperature measurements in the water droplet during its freezing stage.
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