Method of calibrating a wavelength-modulation spectroscopy apparatus

Method of calibrating a wavelength-modulation spectroscopy apparatus

Several methods of calibrating a wavelength-modulation spectroscopy apparatus configured to measure a concentration of an analyte in a sample gas are disclosed. Each of the methods allows for calibration and recalibration using a relatively safe gas regardless of whether the sample gas for which the...

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Hauptverfasser: Liu, Xiaoyong, Huang, Yufeng, Poole, John McKinley, Berkowitz, Gene Smith, Kowal, Anthony, Wehe, Shawn D, Li, Hejie
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Sprache:eng
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creator Liu, Xiaoyong
Huang, Yufeng
Poole, John McKinley
Berkowitz, Gene Smith
Kowal, Anthony
Wehe, Shawn D
Li, Hejie
description Several methods of calibrating a wavelength-modulation spectroscopy apparatus configured to measure a concentration of an analyte in a sample gas are disclosed. Each of the methods allows for calibration and recalibration using a relatively safe gas regardless of whether the sample gas for which the concentration of the analyte can be determined is a hazardous gas. In one embodiment of the invention, calibration that is sample-gas specific is accomplished by determining a first slope coefficient and calibration function for the sample gas, after which a scaling factor can be determined based on the first slope coefficient and a second slope coefficient for the same or a different sample gas and used in a subsequent calibration (or recalibration) to scale the calibration function. In other embodiments of the invention, calibration that is not sample-gas specific is accomplished to allow for the determination of the analyte concentration in variable gas compositions and constant gas compositions.
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title Method of calibrating a wavelength-modulation spectroscopy apparatus
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