Optics: measuring and testing – For light transmission or absorption – Of fluent material
Reexamination Certificate
2007-01-31
2008-12-02
Pham, Hoa Q (Department: 2886)
Optics: measuring and testing
For light transmission or absorption
Of fluent material
C250S339010
Reexamination Certificate
active
07460235
ABSTRACT:
A GFCR system receives light from a scene of interest and focuses it to form an image. Light associated with a selected field-of-view of the image is confined to a spectral band absorbable by a gas of interest and is split into first and second paths. A region that does not substantially interfere with the spectral band is disposed in the first path. A first two-dimensional array of optical detection elements is disposed in the region along with a first diffuser. Disposed in the second path are a gas cell filled with the gas of interest, a second two-dimensional array of optical detection elements, and a second diffuser. The first and second optical arrays generate output signals that are summed to form corresponding first and second sums. A difference between the first and second sums is generated and normalized as a direct measure of the gas of interest.
REFERENCES:
patent: 4578762 (1986-03-01), Wong
patent: 5128797 (1992-07-01), Sachse et al.
patent: 6294785 (2001-09-01), Gordley
patent: 6853452 (2005-02-01), Laufer
patent: 6900893 (2005-05-01), Foley et al.
patent: 2006/0139648 (2006-06-01), Sachse et al.
Bergen Peter J. Van
G&A Technical Software, Inc.
Pham Hoa Q
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