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