Development of Coherent 2-μm Differential Absorption and Wind lidar

摘要

The National Institute of Information and Communications Technology has developed a coherent 2-μm differential absorption and wind lidar (Co2DiaWiL). At the last conference, we presented the outline of the coherent differential absorption lidar. We improved performances of the laser and some issues shown at the last conference. The laser operates at a pulse repetition frequency of 30 Hz and emits an output energy of about 80 mJ with pulse width of 150 ns (FWHM). Preliminary experimental CO_2 measurements were made by the Co2DiaWiL on December 4-5, 2007 and we successfully obtained CO_2 concentration. Experimental CO_2 measurements were made to examine the performance of the coherent differential absorption lidar in April, May, and August 2008. Results of the CO_2 measurements were compared with those measured by a co-located in situ sensor. The results obtained by the Co2DiaWiL agreed with the co-located in situ sensor. Experimental wind measurements were also made to examine the performance of the Co2DiaWiL on wind profiling in August 2008. We found a potential that the coherent wind lidar obtained line-of-sight wind speed in a range of longer than 20 km in a short integration time.