Optics: measuring and testing – By polarized light examination
Reexamination Certificate
2005-07-26
2005-07-26
Nguyen, Tu T. (Department: 2877)
Optics: measuring and testing
By polarized light examination
Reexamination Certificate
active
06922242
ABSTRACT:
An optical path switch divides sample path radiation into a time series of alternating first polarized components and second polarized components. The first polarized components are transmitted along a first optical path and the second polarized components along a second optical path. A first gasless optical filter train filters the first polarized components to isolate at least a first wavelength band thereby generating first filtered radiation. A second gasless optical filter train filters the second polarized components to isolate at least a second wavelength band thereby generating second filtered radiation. A beam combiner combines the first and second filtered radiation to form a combined beam of radiation. A detector is disposed to monitor magnitude of at least a portion of the combined beam alternately at the first wavelength band and the second wavelength band as an indication of the concentration of the substance in the sample path.
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patent: 5343043 (1994-08-01), Johnson
patent: 6057923 (2000-05-01), Sachse
patent: 6611329 (2003-08-01), Sachse
Hammerle Kurt G.
Nguyen Tu T.
The United States of America as represented by the Administrator
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