Patent ID: 6271522
Filing Date: 2001-08-07
Classification: G01N

Abstract:
A process for quantitative analysis of at least one gas parameter over a volume of gas, the analysis being by emission or absorption spectrometry measuring a spectral transmission T or a spectral radiance (intensity) I within a field of view of the spectrometer; the process comprising:providing a spectrometer measuring in the ultra-violet, visible or infrared spectral range and within an optical beam centered on an optical axis;geometrically defining an observation plane oriented approximately perpendicular to a longitudinal gas volume axis;in a first series of measurements, measuring m spectra with the optical axis of the spectrometer lyingsubstantially within the observation plane, while shifting the optical axis within the observation plane between measurements of the m spectra;in a second series of measurements, measuring n spectra with the optical axis of the spectrometer lyingsubstantially within the observation plane, while shifting the optical axis within the observation plane between measurements of the n spectra;whereby two orthogonal sets of optical beams intersect within the observation plane defining a spectrometer optical-axis grid including (m.multidot.n) beam-intersection partial volumes;estimating parameter profiles within the gas volume by mathematically correlating the (m+n) measurements.