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panahi M, shomali R, mollabashi M. Investigation of atmospheric coherence time measurement accuracy In fast defocus model by a 4 aperture differential image motion monitor. ICOP & ICPET _ INPC _ ICOFS 2017; 23 :545-548
URL: http://opsi.ir/article-1-1288-en.html
URL: http://opsi.ir/article-1-1288-en.html
Abstract: (2586 Views)
In this paper the ability of the 4- aperture differential image motion monitor (DIMM) is investigated and discussed to measure the atmospheric coherence time by simulation. Sequences of images with 700 Hz acquisition frequency are simulated to determine the atmospheric defocus and its variations with 4- aperture DIMM. The atmospheric coherence time is derived by fitting the temporal structure function of the atmospheric defocus to the fast defocus model. It is shown that the 4- aperture DIMM is able to measure the atmospheric coherence time accurately in high acquisition frequency.
Keywords: wave-front sensing, atmospheric turbulence, atmospheric defocus structure function, atmospheric coherence time
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