After Kelvin unit implementation on May 2019, doppler broadening thermometry (DBT) method as a primary thermometry has become based on a fixed value of the Boltzmann constant rather than by measuring temperature with respect to reference points. This paper is focused on the measurement of the Doppler broadening of the vibration-rotation line of the acetylene v1+v3 band near 1.54 μm. The preliminary result showed that the relative error of thermodynamic temperature measurement could achieved 0.37% at room temperature. Our analysis indicates that it has the potential to realize miniaturization and calibration free thermodynamic temperature measurement by further studying on DBT.
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