Methane-in-air standards measured using a 1.65um frequency-stabilized cavity ring-down spectrometer

P. M. Chu; J. T. Hodges; G. C. Rhoderick; D. Lisak; J. C. Travis

doi:10.1117/12.684931

25 October 2006 Methane-in-air standards measured using a 1.65μm frequency-stabilized cavity ring-down spectrometer

P. M. Chu, J. T. Hodges, G. C. Rhoderick, D. Lisak, J. C. Travis

Proceedings Volume 6378, Chemical and Biological Sensors for Industrial and Environmental Monitoring II; 63780G (2006) https://doi.org/10.1117/12.684931
Event: Optics East 2006, 2006, Boston, Massachusetts, United States

Abstract

Frequency-stabilized cavity ring-down absorption spectrometry (FS-CRDS) with single-mode excitation using a tunable continuous-wave diode laser is being developed to help support the delivery of reference gas concentration standards. This paper describes initial efforts to compare FS-CRDS measurements with National Institute of Standards and Technology (NIST) methane-in-air standard reference materials to demonstrate the potential of this method to deliver standards-grade measurements with uncertainties of 1 % or lower. The current work demonstrates measurements with residual standard deviations of approximately 1 % for methane sample mole fractions of 50 μmol mol^-1 and above. The results for lower mole fraction samples are poorer due to the poor signal-to-noise ratios and the higher pressures required for the measurements. The current results are potentially limited by the Voigt line shape which was used to model the data.

Citation Download Citation

P. M. Chu, J. T. Hodges, G. C. Rhoderick, D. Lisak, and J. C. Travis "Methane-in-air standards measured using a 1.65μm frequency-stabilized cavity ring-down spectrometer", Proc. SPIE 6378, Chemical and Biological Sensors for Industrial and Environmental Monitoring II, 63780G (25 October 2006); https://doi.org/10.1117/12.684931

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