8th International Topical Meeting on Photoacoustic and Photothermal Phenomena
8 ITMP³ / 8éme conférence internationale de photoacoustique et photothermique

J. Phys. IV France 04 (1994) C7-519-C7-522
DOI: 10.1051/jp4:19947122

The analysis of error in trace gas concentration measurements by intermodulated photoacoustic stark spectroscopy (IMPASS)

T. Groot¹, D. Bicanic¹, M. van Montfort², P. Torfs³, R. Braun¹ and K. van Asselt<sup>1

1</sup>  Laser Photoacoustic Laboratory, Department of Agricultural Engineering and Physics, Agricultural University, Bomenweg 4, 6703 HD Wageningen, The Netherlands
²  Department of Mathematics, Dreijenlaan 4, Agricultural University, 6703 HA Wageningen, The Netherlands
³  Department of Water Resources, Agricultural University, de Nieuwlanden, Nieuwe Kanaal 11, 6709 PA Wageningen, The Netherlands

Abstract
Data collected in an actual IMPASS experiment with a static gaseous mixture (methyl fluoride/ethylene/nitrogen) of preselected concentrations were analyzed with respect to uni(bi)modality, symmetry, skeweness and kurtosis. Bimodal probability distribution function is significantly different from Gaussian suggesting the presence of "mixed" data in the measurements ; the potential cause for this phenomenon is discussed.

© EDP Sciences 1994