Method of and apparatus for monitoring gaseous pollutants

Details Method of and apparatus for monitoring gaseous pollutants Method of and apparatus for monitoring gaseous pollutants

G - Physics

01

N

354/30, 73/59

G01N 21/47 (2006.01) G01N 21/39 (2006.01)

Patent

CA 1183269

ABSTRACT Laser scanning apparatus for the monitoring of gaseous pollutants (e.g. on a chemical plant) in which two laser beams having different wavelengths tone corresponding to an absorption line of the gas to be monitored) and modulated at different frequencies are combined into a single scanning beam. A portion of the scattered radiation is collected, detected and measured to give, for each chosen beam direction, the amount of the gas being monitored. The amount or radiation reaching the detector from the laser source is varied according to a predetermined programme or in response to an external stimulus, and by this means the detector can be protected against severe overload when the beam scans over positions of abnormally high reflectivity.

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