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15 October 1993 Recent modifications and measurements with a ground-based lidar system
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A ground-based lidar facility, which has been in operation at the NASA Langley Research Center since 1974, has been substantially upgraded with state-of-the-art technology, including 12-bit CAMAC based digitizers and a 386 computer with a laser printer and optical disk drive. An Nd:YAG laser was added to the system to provide wavelengths at 1064 nm and 532 nm. A new detector package was added to accommodate the ruby 649 nm and the YAG 532 nm wavelengths with provisions to add a detector for 1064 nm later. Photon counting at 532 nm is also possible with the addition of the new detector package and a cooled photomultiplier tube. Backscatter measurements from the stratospheric aerosol cloud, produced by the 1991 eruption of Mount Pinatubo, have been obtained with the system operating in the analog mode at 694 nm. Regular measurements, approximately weekly, were made over a period of a year and a half after the eruption. The results indicate a continuous aerosol increase, with multi-layered structure, over the measurement site for the first eight months following the eruption, after which the aerosol loading started decreasing and has continued, but the aerosol backscatter a year and a half after the eruption was still substantially above the pre-Pinatubo levels.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David C. Woods, David M. Winker, Otto Youngbluth Jr., Mary T. Osborn, and Robert J. DeCoursey "Recent modifications and measurements with a ground-based lidar system", Proc. SPIE 1936, Applied Laser Radar Technology, (15 October 1993);

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