Gas measurement over extreme dynamic range of concentrations

Optics: measuring and testing – For light transmission or absorption – Of fluent material

Reexamination Certificate

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C356S409000

Reexamination Certificate

active

07616316

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.

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