Frequency-mixed CO.sub.2 laser radar for remote detection of gas

Details Frequency-mixed CO.sub.2 laser radar for remote detection of gas Frequency-mixed CO.sub.2 laser radar for remote detection of gas

1982-06-07

1984-05-22

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

356437, G01N 2139

Patent

active

044503563

ABSTRACT:
Gases in the atmosphere are detected remotely using a frequency-mixed CO.sub.2 laser beam formed by passing the beam from a first CO.sub.2 laser through a frequency doubler and then frequency-adding the output to the frequency from a second CO.sub.2 laser to obtain wavelengths in the 3 micron region. A first wavelength in this region, preselected for nonabsorption by the gases to be detected, is transmitted through the gases toward an object capable of reflecting the beam back. A second wavelength preselected as highly absorbed by the gases to be detected is then transmitted. The presence and quantity of the gases is then determined by the difference in the amount respectively absorbed at the two wavelengths.

REFERENCES:
Stewart, "Development of a Pulsed 9.5 .mu.m Lidar for Regional Scale O.sub.3 Measurement", Opt. Eng., 19 (4), Jul./Aug. 1980, pp. 503-507.
Browell, "Airborne Differential Absorption Lidar Lidar System for Water Vapor Investigations", Opt. Eng., 20 (1), Jan./Feb. 1981, pp. 84-90.
Murray, "Remote Measurement of Gases Using Differential-Absorption Lidar", Opt. Eng., 17 (1), Jan./Feb. 1978, pp. 30-38.

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