OPTICAL GAS SENSOR
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Accused Products
Abstract
A gas sensor and method for ascertaining the concentration of one or more gas species, in the exhaust gas of an internal combustion engine. The gas sensor includes a measuring cell having a gas inlet, a gas outlet, a catalysis area, and an analysis area. The sensor also includes a catalytic converter for catalyzing a reaction of a first gas species to form a second gas species in the catalysis area, and a gas analyzer for spectroscopically measuring the concentration of the second gas species in the analysis area. Through the catalytic converter, a first gas species may be converted into a second gas species whose absorption and/or scattering wavelength(s) are within the emission wavelength range of semiconductor radiation sources, so that the gas analyzer may have a semiconductor radiation source.
15 Citations
26 Claims
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1-12. -12. (canceled)
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13. A gas sensor for ascertaining a concentration of one or more gas species, comprising:
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a measuring cell having a gas inlet, a gas outlet, a catalysis area, and an analysis area, the catalysis area being situated on a gas inlet side of the analysis area; a catalytic converter to catalyze a reaction of a first gas species to form a second gas species in the catalysis area; and a gas analyzer to spectroscopically measure the concentration of the second gas species in the analysis area. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for ascertaining concentration of one or more gas species, comprising:
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a) converting a first gas species into a second gas species; b) spectroscopically measuring concentration of the second gas species; and c) ascertaining concentration of the first gas species from the concentration of the second gas species measured in step b). - View Dependent Claims (25, 26)
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Specification