Optics: measuring and testing – For light transmission or absorption – Of fluent material
Reexamination Certificate
2006-06-20
2006-06-20
Lauchman, Layla G. (Department: 2877)
Optics: measuring and testing
For light transmission or absorption
Of fluent material
C356S336000
Reexamination Certificate
active
07064834
ABSTRACT:
This invention relates to methods and systems for detecting contaminants that can precipitate and deposit on a workpiece during a carbon dioxide application, especially contaminants that are already present and dissolved in the fresh carbon dioxide fed to the application. One aspect of this invention includes a method of detecting contaminants dissolved in a carbon dioxide stream, including the steps of sampling at least a portion of the carbon dioxide stream to form a carbon dioxide sample; modifying at least one physical condition of the carbon dioxide sample to form an aerosol that includes gaseous carbon dioxide and at least one suspended contaminant; and detecting the number of particles of suspended contaminant in at least a portion of the carbon dioxide sample with at least one particle counter. A system for continuously detecting contaminants dissolved in a carbon dioxide stream is also described.
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Billingham John Fredric
Heim Carl Joseph
Johnson Michael Clinton
Malczewski Mark Leonard
Lauchman Layla G.
Praxair Technology Inc.
Schwartz Iurie A.
Valentin, II Juan D.
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