Ring-down cavity spectroscopy cell using continuous wave excitat

Details Ring-down cavity spectroscopy cell using continuous wave excitat Ring-down cavity spectroscopy cell using continuous wave excitat

1994-11-07

1996-06-18

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

356439, G01N 2117

Patent

active

055280404

ABSTRACT:
An apparatus for detection and measurement of trace species in a sample gas. A ring down cavity cell is filled with the sample gas. A continuous wave laser emits radiation, which is directed from the continuous wave laser to the ring down cavity cell where it resonates. A photodetector measures radiation levels resonated by the ring down cavity cell and produces a corresponding signal. The decay rate of the ring down cavity cell is calculated from the signal produced by the photodetector and is used to determine the level of trace species in the sample gas.

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