| タイトル | Airborne differential absorption lidar system for measurements of atmospheric water vapor and aerosols |
| 本文（外部サイト） | http://hdl.handle.net/2060/19960028782 |
| 著者（英） | Ponsardin, Patrick; Mayo, M. Neale; Browell, Edward V.; Grant, William B.; Ismail, Syed; Mayor, Shane D.; Hueser, Alene W.; Grossman, Benoist E.; Allen, Robert J.; Butler, Carolyn F.; Higdon, Noah S.; Carter, Arlen F. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 1994-09-20 |
| 言語 | eng |
| 内容記述 | An airborne differential absorption lidar (DIAL) system has been developed at the NASA Langley Research Center for remote measurements of atmospheric water vapor (H2O) and aerosols. A solid-state alexandrite laser with a 1-pm linewidth and greater than 99.85% spectral purity was used as the on-line transmitter. Solid-state avalanche photodiode detector technology has replaced photomultiplier tubes in the receiver system, providing an average increase by a factor of 1.5-2.5 in the signal-to-noise ratio of the H2O measurement. By incorporating advanced diagnostic and data-acquisition instrumentation into other subsystems, we achieved additional improvements in system operational reliability and measurement accuracy. Laboratory spectroscopic measurements of H2O absorption-line parameters were performed to reduce the uncertainties in our knowledge of the absorption cross sections. Line-center H2O absorption cross sections were determined, with errors of 3-6%, for more than 120 lines in the 720-nm region. Flight tests of the system were conducted during 1989-1991 on the NASA Wallops Flight Facility Electra aircraft, and extensive intercomparison measurements were performed with dew-point hygrometers and H2O radiosondes. The H2O distributions measured with the DIAL system differed by less than 10% from the profiles determined with the in situ probes in a variety of atmospheric conditions. |
| NASA分類 | Meteorology and Climatology |
| レポートNO | 96N29442
NASA-CR-201044
NAS 1.26:201044 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/103791 |
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