Multiple component gas analyzer
First Claim
1. In a gas analyzer for N gases having overlapping absorption spectra, where N is an integer greater than 1, said analyzer of the type comprising a sample cell adapted to contain a gas to be analyzed and a source operative to generate at least one measuring beam which passes through the sample cell, the improvement comprising:
- means, responsive to the at least one measuring beam, for generating N measuring signals, each indicative of optical energy from the source transmitted through the sample cell in a respective optical region characterized by a respective optical center wavelength λ
i and a respective bandpass Δ
λ
i, where i is an integer greater than 0 and less than or equal to N;
means, responsive to the N measuring signals, for combining the N measuring signals to automatically determine which of the N gases is present in the sample cell in the greatest concentration and the concentration thereof.
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Abstract
A gas multiple component analyzer includes an infrared source that passes at least one measuring beam through a sample cell that contains the gas to be analyzed. Three measuring signals are generated in response to the measuring beam, and each is indicative of optical energy from the source transmitted through the sample cell in a respective optical region characterized by a respective optical center wave-length and a respective band pass. The three measuring signals are algebraically combined to automatically determine which of the three end gases is present in the sample cell in the greatest concentration, and the concentration thereof. The disclosed system measures concentration of three separate gases having overlapping absorption spectra.
94 Citations
14 Claims
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1. In a gas analyzer for N gases having overlapping absorption spectra, where N is an integer greater than 1, said analyzer of the type comprising a sample cell adapted to contain a gas to be analyzed and a source operative to generate at least one measuring beam which passes through the sample cell, the improvement comprising:
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means, responsive to the at least one measuring beam, for generating N measuring signals, each indicative of optical energy from the source transmitted through the sample cell in a respective optical region characterized by a respective optical center wavelength λ
i and a respective bandpass Δ
λ
i, where i is an integer greater than 0 and less than or equal to N;means, responsive to the N measuring signals, for combining the N measuring signals to automatically determine which of the N gases is present in the sample cell in the greatest concentration and the concentration thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a gas analyzer for N gases having overlapping absorption spectra, where N is an integer greate than 1, said analyzer of the type comprising a sample cell adapted to contain a gas to be analyzed, and a source operative to generate at least one measuring beam passing through the sample cell, the improvement comprising:
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N optical filters, each having a center wavelength λ
i and an optical band pass Δ
λ
i, where i is an integer greater than 0 and less than or equal to N;means for generating N measuring signals, each in response to a portion of the measuring beam filtered by the respective filter, λ
i and Δ
λ
i chosen for each filter such that the respective measuring signal is a substantially linear function of concentration of each of the N gases in the sample cell, and;means for algebraically combining the N measuring signals to automatically determine the concentrations of each of the N gases in the sample cell. - View Dependent Claims (11, 12, 13, 14)
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Specification
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- Resources
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Current AssigneeCriticare Systems, Inc. (Opto Circuits (India) Ltd.)
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Original AssigneeCriticare Systems, Inc. (Opto Circuits (India) Ltd.)
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InventorsConlon, Brendan, Dittmar, James
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Primary Examiner(s)Hannaher, Constantine
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Application NumberUS07/321,897Time in Patent Office389 DaysField of Search250/343, 250/339US Class Current250/339.13CPC Class CodesG01N 2021/3129 Determining multicomponents...G01N 2021/3174 Filter wheelG01N 21/3504 for analysing gases, e.g. m...G01N 21/61 Non-dispersive gas analyser...
