Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1998-04-17
1999-06-29
Evans, F. L.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250343, 356328, G01N 2135, G01J 342
Patent
active
059171880
ABSTRACT:
Contaminants are detected optically at concentrations below 100 part-per-million (ppm) and extending to a level approaching 1 part-per-trillion (ppt) by using intracavity laser spectroscopy (ILS) techniques. A diode laser-pumped solid-state laser (the ILS laser) is employed as a detector. The ILS laser comprises an ion-doped crystal medium contained in a laser cavity optically pumped by a diode laser pump laser. A gas sample containing gaseous contaminant species is placed inside the laser cavity and on one side of the ion-doped crystal. The output signal from the ILS laser is detected and analyzed to identify the gaseous species (via its spectral signature). The concentration of the gaseous species can be determined from the spectral signature as well.
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Atkinson George H.
Mehdizadeh Esmail
Pilgrim Jeffrey S.
Evans F. L.
Innovative Lasers Corporation
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