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Real-time atmospheric absorption spectra for in-flight tuning of an airborne dial systemReal-time measurements of atmospheric absorption spectra are displayed and used to precisely calibrate and fix the frequency of an Alexandrite laser to specific oxygen absorption features for airborne Differential Absorption Lidar (DIAL) measurements of atmospheric pressure and temperature. The DIAL system used contains two narrowband tunable Alexandrite lasers: one is electronically scanned to tune to oxygen absorption features for on-line signals while the second is used to obtain off-line (nonabsorbed) atmospheric return signals. The lidar operator may select the number of shots to be averaged, the altitude, and altitude interval over which the signals are averaged using single key stroke commands. The operator also determines exactly which oxygen absorption lines are scanned by comparing the line spacings and relative strengths with known line parameters, thus calibrating the laser wavelength readout. The system was used successfully to measure the atmospheric pressure profile on the first flights of this lidar, November 20, and December 9, 1985, aboard the NASA Wallops Electra aircraft.
Document ID
19870000863
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dombrowski, M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Walden, H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Schwemmer, G. K. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Milrod, J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Korb, C. L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 13, 2013
Publication Date
August 1, 1986
Publication Information
Publication: NASA. Langley Research Center 13th International Laser Radar Conference
Subject Category
Communications And Radar
Accession Number
87N10296
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19870000830Collected WorksThirteenth International Laser Radar Conference
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