Optics: measuring and testing – For light transmission or absorption – Of fluent material
Reexamination Certificate
2005-09-13
2005-09-13
Smith, Zandra V. (Department: 2877)
Optics: measuring and testing
For light transmission or absorption
Of fluent material
C356S437000, C356S440000
Reexamination Certificate
active
06943886
ABSTRACT:
A method for conducting laser absorption measurements in high temperature process streams having high levels of particulate matter is disclosed. An impinger is positioned substantially parallel to a laser beam propagation path and at upstream position relative to the laser beam. Beam shielding pipes shield the beam from the surrounding environment. Measurement is conducted only in the gap between the two shielding pipes where the beam propagates through the process gas. The impinger facilitates reduced particle presence in the measurement beam, resulting in improved SNR (signal-to-noise) and improved sensitivity and dynamic range of the measurement.
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Marin Ovidiu
Mulderink Kenneth A.
Von Drasek William A.
Air Liquide America L.P.
Cronin Christopher J.
L'Air Liquide- Societe Anonyme a'Directoire et Conseil de Survei
Russell Linda K.
Smith Zandra V.
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