Multiple beam wide band CRDS cavity sensor and detector

Multiple beam wide band CRDS cavity sensor and detector

A common multi-gas ring down detector (10) incorporates a cavity that has a piezoelectric mirror (20) and at least two displaced mirrors (26a,26b,28a,28b) to define two different transit paths (P1,P2) in the cavity. The two paths intersect at the piezoelectric mirror at different angles (A1,A2). Two...

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Bibliographische Detailangaben
1. Verfasser: COLE BARRETT E
Format: Patent
Sprache:eng
Schlagworte:
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Zusammenfassung:A common multi-gas ring down detector (10) incorporates a cavity that has a piezoelectric mirror (20) and at least two displaced mirrors (26a,26b,28a,28b) to define two different transit paths (P1,P2) in the cavity. The two paths intersect at the piezoelectric mirror at different angles (A1,A2). Two different laser beams (B1,B2) having first and second different wavelengths, can be coupled to the cavity, at different times, by driving the piezoelectric mirror axially. Beam outputs can be evaluated to establish the presence of selected gases in the cavity.