Heterodyne CO2 DIAL and its measurements

John R. Roadcap; Mitchell H. Laird; Edmund A. Murphy; David L. A. Rall; Ronald Frelin; Patrick J. McNicholl

doi:10.1117/12.283908

31 October 1997 Heterodyne CO₂ DIAL and its measurements

John R. Roadcap, Mitchell H. Laird, Edmund A. Murphy, David L. A. Rall, Ronald Frelin, Patrick J. McNicholl

Proceedings Volume 3127, Application of Lidar to Current Atmospheric Topics II; (1997) https://doi.org/10.1117/12.283908
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

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.

Citation Download Citation

John R. Roadcap, Mitchell H. Laird, Edmund A. Murphy, David L. A. Rall, Ronald Frelin, and Patrick J. McNicholl "Heterodyne CO₂ DIAL and its measurements", Proc. SPIE 3127, Application of Lidar to Current Atmospheric Topics II, (31 October 1997); https://doi.org/10.1117/12.283908

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