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Linking the thermodynamic temperature to an optical frequency: Recent advances in Doppler broadening thermometry
Linking the thermodynamic temperature to an optical frequency: Recent advances in Doppler broadening thermometry
- Source :
- Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
- Publication Year :
- 2016
-
Abstract
- Laser spectroscopy in the linear regime of radiation–matter interaction is a powerful tool for measuring thermodynamic quantities in a gas at thermodynamic equilibrium. In particular, the Doppler effect can be considered a gift of nature, linking the thermal energy to an optical frequency, namely the line centre frequency of an atomic or molecular spectral line. This is the basis of a relatively new method of primary gas thermometry, known as Doppler broadening thermometry (DBT). This paper reports on the efforts that have been carried out, in the last decade, worldwide, to the end of making DBT competitive with more consolidated and accurate methodologies, such as acoustic gas thermometry and dielectric constant gas thermometry. The main requirements for low-uncertainty DBT, of both theoretical and technical nature, will be discussed, with a special focus on those related to the line shape model and to the frequency scale. A deep comparison among the different molecules that have been selected in successful DBT implementations is also reported. Finally, for the first time, to the best of my knowledge, the influence of refractive index effects is discussed.
- Subjects :
- Materials science
Operations research
Thermodynamic equilibrium
General Mathematics
Laser absorption spectroscopy
General Physics and Astronomy
Dielectric
01 natural sciences
Spectral line
010309 optics
symbols.namesake
Physics and Astronomy (all)
Engineering (all)
0103 physical sciences
Spectral line shape
Mathematics (all)
spectral line shapes
010306 general physics
Spectroscopy
Review Articles
business.industry
Molecular spectra
General Engineering
Articles
Thermodynamic temperature
Doppler effect
Computational physics
Collisional effect
Primary gas thermometry
symbols
business
collisional effects
Thermal energy
Doppler broadening
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
- Accession number :
- edsair.doi.dedup.....2c42c558c02a54257efb49c1cd0bd236