US 6,271,522 B1Granted

Process for the quantitative analysis of gas volumes, specifically exhaust and waste gases from combustion systems or incineration plants, as well as systems for performing these processes

AssigneeDeutsches Zentrum für Luft- und Raumfahrt e.V.

InventorsErwin Lindermeir, Peter Haschberger, Birger Schimpp, Franz Schreier, Volker Tank

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Abstract

For quantitative analysis of gas volumes, specifically combustion exhaust gases, by means of emission or absorption spectrometry in the ultraviolet, visible and infrared spectral range, geometrically defined and reproducibly adjustable observation planes are oriented perpendicular to the longitudinal axis of an exhaust stream. In a first series of measurements a number of m spectral measurements is performed, in such a way that the optical axis of a spectrometer is always located in the respective observation level but is shifted in a parallel direction by a first distance from one measurement to the next. In a second series of measurements n measurements are performed, in such a way that the optical axis is again located in the observation plane and is shifted in a parallel direction by a second distance from each measurement to the next. The (m+n) measurements produce two orthogonal sets of line of sights, which form a grid with (m·n) intersecting volumes. With the aid of the (m+n) measurements, each measurement yields the spectral transmission τ(v), or the spectral radiation intensity I(v) which is integrated via the total gas volume in the beam of rays of the spectrometer field of view.

Claims24

Dependent claims

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 lying
substantially 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 lying
substantially 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·n) beam-intersection partial volumes;
estimating parameter profiles within the gas volume by mathematically correlating the (m+n) measurements.

6 more elements

Dependencies are inferred from the claim text.