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25 October 2006 Methane-in-air standards measured using a 1.65μm frequency-stabilized cavity ring-down spectrometer
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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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);

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