Using integrating spheres with wavelength modulation spectroscopy: effect of pathlength distribution on 2nd harmonic signals

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dc.contributor.author Hodgkinson, Jane -
dc.contributor.author Masiyano, Dackson -
dc.contributor.author Tatam, Ralph P. -
dc.date.accessioned 2014-04-15T04:01:15Z
dc.date.available 2014-04-15T04:01:15Z
dc.date.issued 2013-02-01T00:00:00Z -
dc.identifier.citation J. Hodgkinson, D. Masiyano, and R.P. Tatam. Using integrating spheres with wavelength modulation spectroscopy: effect of pathlength distribution on 2nd harmonic signals. Applied Physics B, February 2013, Volume 110, Issue 2, pp223-231
dc.identifier.issn 0946-2171 -
dc.identifier.uri http://dx.doi.org/10.1007/s00340-012-5166-7 -
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/8389
dc.description.abstract We have studied the effect on 2nd harmonic wavelength modulation spectroscopy of the use of integrating spheres as multipass gas cells. The gas lineshape becomes distorted at high concentrations, as a consequence of the exponential pathlength distribution of the sphere, introducing nonlinearity beyond that expected from the Beer-Lambert law. We have modelled this numerically for methane absorption at 1.651μm, with gas concentrations in the range of 0-2.5%vol in air. The results of this model compare well with experimental measurements. The nonlinearity for the 2f WMS measurements is larger than that for direct scan measurements; if this additional effect were not accounted for, the resulting error would be approximately 20% of the reading at a concentration of 2.5 %vol methane. en_UK
dc.language.iso en_UK -
dc.publisher Springer Science Business Media en_UK
dc.rights The original publication is available at www.springerlink.com
dc.title Using integrating spheres with wavelength modulation spectroscopy: effect of pathlength distribution on 2nd harmonic signals en_UK
dc.type Article -


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