| US 7,616,316 B1 | ||
| Gas measurement over extreme dynamic range of concentrations | ||
| Joel A. Silver, Santa Fe, N. Mex. (US); Mark E. Paige, Santa Fe, N. Mex. (US); and David S. Bomse, Santa Fe, N. Mex. (US) | ||
| Assigned to Southwest Sciences Incorporated, Santa Fe, N. Mex. (US) | ||
| Filed on Feb. 27, 2007, as Appl. No. 11/679,608. | ||
| Claims priority of provisional application 60/777329, filed on Feb. 27, 2006. | ||
| Int. Cl. G01N 21/00 (2006.01) | ||
| U.S. Cl. 356—437 [356/409] | 22 Claims |
| 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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