Doppler Broadening Thermometry Based On Cavity Ring-down Spectroscopy

Hu, Shui-Ming

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https://hdl.handle.net/2142/51149 Copy

Description

Title

Doppler Broadening Thermometry Based On Cavity Ring-down Spectroscopy

Author(s)

Hu, Shui-Ming

Contributor(s)

• Zhang, Jin-Tao
• Liu, An-Wen
• Sun, Yu Robert
• Tan, Yan
• Wang, Jin
• Cheng, Cunfeng

Issue Date

2014-06-17

Keyword(s)

Instrument/Technique Demonstration

Abstract

A Doppler broadening thermometry is implemented using a laser-locked cavity ring-down spectrometer%~[1,2] \footnote{ H. Pan, C.-F. Cheng, Y.~R. Sun, B. Gao, A.-W. Liu, S.-M. Hu, ``Laser-locked, continuously tunable high resolution cavity ring-down spectrometer,'' Rev. Sci. Instrum. \textbf{82}, 103110 (2011)} \footnote{ Y.~R. Sun, H. Pan, C.-F. Cheng, A.-W. Liu, J.-T. Zhang, S.-M. Hu, ``Application of cavity ring-down spectroscopy to the Boltzmann constant determination,'' Opt. Express, \textbf{19}, 19993 (2011) } combined with a temperature-stabilized sample cell. The temperature fluctuation of the gas sample cell is kept below 1 mK for hours. The probing laser is frequency locked at a longitudinal mode of a Fabry-P\'{e}rot interferometer made of ultra-low-expansion glass, and the spectral scan is implemented by scanning the sideband produced by an electro-optic modulator. As a result, a kHz precision has been maintained during the measurement of the spectrum of 10 GHz wide. A ro-vibrational line of C$_2$H$_2$ is measured at sample pressures of a few Pa. Using a pair of mirrors with a reflectivity of 0.99997 at 787 nm, we are able to detect absorption line profiles with a signal-to-noise ratio of $10^5$. Fitting of the recorded spectra allows us to determine the Doppler width with a statistical uncertainty of 10 ppm. Further improvements on the experimental reproducibility and investigations on the collision effects will probably lead to an optical determination of the Boltzmann constant with an uncertainty of a few ppm. %\begin{thebibliography}{2}% %\bibitem {Pan2011RSI_LL_CRDS}% % H. Pan, C.-F. Cheng, Y.~R. Sun, B. Gao, A.-W. Liu, S.-M. Hu, % ``Laser-locked, continuously tunable high resolution cavity ring-down spectrometer,'' % Rev. Sci. Instrum. \textbf{82}, 103110 (2011) % %\bibitem {Sun2011OE}% % Y.~R. Sun, H. Pan, C.-F. Cheng, A.-W. Liu, J.-T. Zhang, S.-M. Hu, % ``Application of cavity ring-down spectroscopy to the Boltzmann constant determination,'' % Opt. Express, \textbf{19}, 19993 (2011) % %\end{thebibliography}%

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/51149

DOI

https://doi.org/10.15278/isms.2014.TJ12

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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