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Proceedings Paper

Heterodyne CO2 DIAL and its measurements
Author(s): John R. Roadcap; Mitchell H. Laird; Edmund A. Murphy; David L. A. Rall; Ronald Frelin; Patrick J. McNicholl
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Paper Abstract

The Geophysics Directorate of Phillips Laboratory has recently completed redesign of a heterodyne CO2 differential absorption lidar which can simultaneously measure range resolved radial velocity, aerosol backscatter, and differential absorption. The transportable system utilizes two CO2 transversely excited atmospheric (TEA) lasers which can be discretely tuned to many of the rotational lines compromising the 00 degree 1 to 10 degrees 0 vibrational bands of CO2. These lines span a spectral region from about 9.2 to 10.8 micrometers and allow for the DIAL measurement of some minor atmospheric molecular constituents as well as many anthropogenic organic species which have absorption bands in this spectral region. Transmission and reception is coaxial via a single shared 12 inch telescope and hemispherical scanner. Complete spectral processing of the heterodyne signals provides not only backscatter and differential absorption information but also radial wind velocity. Each TEA laser produces a line dependent pulse energy of 20-80 mJ at up to 150 Hz. Presently, the system is processor limited to a net pulse rate of 140 Hz. Results shown will include time-height cross-sections of cirrus backscatter, comparisons of CO2 DIAL-derived water vapor profiles with simultaneous surface and radiosonde in-situ measurements, and wind velocity profiles in the troposphere.

Paper Details

Date Published: 31 October 1997
PDF: 11 pages
Proc. SPIE 3127, Application of Lidar to Current Atmospheric Topics II, (31 October 1997); doi: 10.1117/12.283908
Show Author Affiliations
John R. Roadcap, Air Force Research Lab. (United States)
Mitchell H. Laird, Air Force Research Lab. (United States)
Edmund A. Murphy, Air Force Research Lab. (United States)
David L. A. Rall, PhotoMetrics, Inc. (United States)
Ronald Frelin, PhotoMetrics, Inc. (United States)
Patrick J. McNicholl, PhotoMetrics, Inc. (United States)


Published in SPIE Proceedings Vol. 3127:
Application of Lidar to Current Atmospheric Topics II
Arthur J. Sedlacek; Kenneth W. Fischer, Editor(s)

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