Laser & Optoelectronics Progress, Volume. 49, Issue 3, 30103(2012)
DIMM System for Tracking Motion Target and Calculating the Atmospheric Coherence Length along Slant Propagation Path
A new differential image motion monitor (DIMM) system for measuring atmospheric coherence length which can track motion target is developed. The system uses a new algorithm which is composed of genetic algorithm and iterative centroid algorithm to process differential image and calculate the offset of the target and the covariance of the angle-of-arrival fluctuation in realtime. So, it can track motion targets and measure the atmospheric coherence length. In experiment, we use a halogen lamp tied in a stratosphere balloon at the altitude of 35 km as the lamp-house to measure the atmospheric coherence length along slant propagation path. Simultaneously, we put another instrument 5 m away from the new system which selects the solar limb as the lamp-house to measure the total layer atmospheric coherence length. The result indicates a linear correlation between the two groups of data. At last, we analyze and discuss the feasibility of a method which can use laser guide star to measure the total layer atmospheric coherence length.
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Xu Peng, Wang Jianye, Shao Hui, Wu Yi, Li Guang. DIMM System for Tracking Motion Target and Calculating the Atmospheric Coherence Length along Slant Propagation Path[J]. Laser & Optoelectronics Progress, 2012, 49(3): 30103
Category: Atmospheric Optics and Oceanic Optics
Received: Aug. 10, 2011
Accepted: --
Published Online: Dec. 23, 2011
The Author Email: Peng Xu (xup@mail.ustc.edu.cn)