Method for enhanced gas monitoring in high particle density flow streams
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United States of America Patent
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Sep 13, 2005
Grant Date -
Nov 27, 2003
app pub date -
Jan 29, 2003
filing date -
Feb 11, 2002
priority date (Note) -
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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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