Computer Science
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2828..450j&link_type=abstract
Proc. SPIE Vol. 2828, p. 450-456, Image Propagation through the Atmosphere, J. C. Dainty; Luc R. Bissonnette; Eds.
Computer Science
Scientific paper
When optical beam propagates through the atmosphere, the wavefront is distributed by the turbulence. The wavefront error can be measured by Hartmann-Shack wavefront sensor (HSWFS) as arrival angle fluctuations in subapertures. Statistic characteristics of atmospheric turbulence can be calculated from these data. To make these characteristics more accurate, the spatial and temporal resolution should be high, and the measurement time should be long enough. A high resolution measuring and data processing system has been built for this usage. A 37-element HSWFS and a high frame rate (800 Hz) CCD image sensor are used in this system. Image data from CCD are processed by a multi-processor system in real time to extract the wavefront slope data of each subaperture. These slope data are sent into the extension memory of a personal computer, which is the host computer of the system. Data of about 200,000 frames can be stored continuously for one measurement period. After this period, these data are saved in hard disk, and the characteristics of turbulence can be obtained from these data.
Chen Leon L.
Jiang Lingtao
Jiang Wenhan
Rao Xuejun
Wang Cheng
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