Patent ID: 7446317
Filing Date: 2008-11-04
Classification: G01N

Abstract:
1. A multi-pass gas cell comprising: a cell body configured for allowing a gas to be analyzed to pass therethrough under high pressure, high temperature, or both; a first fiber-optic port for transmitting radiation into the cell body; means for adjusting an alignment condition of the fiber-optic input; a mirrored window having a inner reflective surface exposed to an interior of the elongated cell body for reflecting the radiation within the cell body; a second fiber optic port for receiving the radiation reflected by the mirrored window and outputting it for analysis; and the mirrored window further having an outer surface and a transmittance characteristic that permits a portion of the radiation to pass through the mirrored window as a visual indicator of the alignment condition of the reflected radiation relative to the first and second fiber-optic ports.