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Non-Contact Thermometer for Improved Air Temperature Measurements
Marco Pisani1, Milena Astrua1, Andrea Merlone1
1Istituto Nazionale di Ricerca Metrologica (INRIM), Strada delle Cacce 91, 10135 Torino, Italy.
Sensors (Basel, Switzerland)
|February 28, 2023
Summary
A new compact thermometer measures air temperature using sound speed. It shows high accuracy and immunity to irradiation, eliminating the need for calibration.
Area of Science:
- Metrology
- Thermometry
- Acoustics
Background:
- Traditional thermometers like platinum resistance thermometers are susceptible to environmental factors.
- Accurate air temperature measurement is crucial for various applications, including atmospheric studies.
Purpose of the Study:
- To compare a novel compact thermometer based on sound speed measurement with platinum resistance thermometers.
- To evaluate the performance of the sound speed thermometer under various environmental conditions.
Main Methods:
- Development of a compact thermometer utilizing the speed of sound for air temperature measurement.
- Comparative analysis in a climatic chamber across a temperature range of -30 °C to +55 °C.
- Testing under varying relative humidity (10-90)%rh and high irradiation (>1 kW/m²).
Main Results:
- The sound speed thermometer demonstrated overall uncertainty values of 0.2 °C (-30 °C to +30 °C) and 0.6 °C (+30 °C to +55 °C).
- The instrument exhibited immunity to irradiation errors.
- The thermometer did not require temperature calibration.
Conclusions:
- The compact sound speed thermometer offers a viable and accurate alternative for air temperature measurement.
- Its robustness against irradiation and lack of calibration requirement make it suitable for surface atmospheric conditions.
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