Gas measurement over extreme dynamic range of concentrations
First Claim
1. An optical spectroscopy apparatus for measurement of species concentration, number density, or column density, said apparatus comprising:
- a laser light source;
a single fixed length optical path receiving light from said source and containing a gaseous species to be detected;
a detector receiving light at an end of said path; and
signal processing electronics connected to said detector; and
wherein said apparatus has a plurality of operational modes measuring a same absorption feature of the species and wherein said apparatus switches between modes depending on measured absorbance.
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Abstract
An optical spectroscopy apparatus and method for measurement of species concentration, number density, or column density comprising emitting light from a laser light source, receiving light via a fixed length optical path from the source and containing a species to be detected, receiving light via a detector at an end of the path, determining one or more of species concentration, number density, and column density via signal processing electronics connected to the detector, and switching between a plurality of operational modes measuring a same absorption feature of the species depending on measured absorbance.
46 Citations
22 Claims
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1. An optical spectroscopy apparatus for measurement of species concentration, number density, or column density, said apparatus comprising:
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a laser light source; a single fixed length optical path receiving light from said source and containing a gaseous species to be detected; a detector receiving light at an end of said path; and signal processing electronics connected to said detector; and wherein said apparatus has a plurality of operational modes measuring a same absorption feature of the species and wherein said apparatus switches between modes depending on measured absorbance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An optical spectroscopy method for measurement of species concentration, number density, or column density, the method comprising the steps of:
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emitting light from a laser light source; receiving light via a single fixed length optical path from the source and containing a gaseous species to be detected; receiving light via a detector at an end of the path; determining one or more of species concentration, number density, and column density via signal processing electronics connected to the detector; and switching between a plurality of operational modes measuring a same absorption feature of the species depending on measured absorbance. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification