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

1982-03-01

1984-12-25

Evans, F. L.

Optics: measuring and testing

By shade or color

With sample responsive to plural colors applied simultaneously

250339, 356 51, 356437, G01N 2135

Patent

active

044900430

ABSTRACT:
Laser scanning apparatus for the monitoring of gaseous pollutants (e.g. on a chemical plant) in which two laser beams having different wavelengths (one 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 of 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.

REFERENCES:
patent: 3361912 (1968-01-01), Lundberg
patent: 3766380 (1973-10-01), Menzies
patent: 4072858 (1978-02-01), Stone
patent: 4146799 (1979-03-01), Pitt et al.
Optics and Laser Technology, vol. 13, No. 1, Feb. 1981, C. Werner "Slant Range Visibility Determination from Lidar Signatures by the Two-Point Method", pp. 27 to 36.
Marthinsson et al., Optical and Quantum Electronics, vol. 12, No. 4, Jul. 1980, pp. 327-334.

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