D4.3 Ro-Vibrational Spectroscopic Gas Thermometry (RVSGT): A New Primary Method for Gas Thermometer Calibrations?
- SMSI 2021
2021-05-03 - 2021-05-06
- SMSI 2021 - System of Units and Metreological Infrastructure
- D4 Advanced Calibration Approaches
- G. Li, V. Ebert - Physikalisch-Technische Bundesanstalt, Braunschweig (Germany)
- 325 - 326
Gas temperature measurements play an important role for industrial process control, combustion technology, but also for environmental and climate science. Absolute calibration of contact gas thermometers is difficult and has a number of practical challenges when aiming on high accuracies. Rovibrational spectroscopic gas thermometry RVSGT, directly employs molecules as smallest possible “sensors”, can be “read out” remotely using light absorption and can serve as a primary reference method for direct gas thermometer calibrations. Here, we present a new methodology to extract the gas temperature from a ro-vibrational spectrum of a “sensor” molecule measured by FT-spectrometry.