Acta Photonica Sinica, Volume. 41, Issue 7, 805(2012)
Turbulence Characteristics Optical Test Contrast
During the temperature difference of 10℃~230℃, three kinds of ShackHartman measuring methods are used to contrast atmospheric coherence length r0 with quadrant detector(QD), and ShackHartman(SH) and photomultiplier tube(PMT) respectively are applied to contrast refractive index structure parameter C2n with scintillation power spectrum. The experimental results show that: for r0 , the stability of QD decreases more obviously than SH when there is strong turbulence, and for three ShackHartman methods, DIMM overcomes problems such as device jitter but brings in problem of inconsistency in direction which wave front method can avoid; for C2n, SH is more precise than PMT which fitting correlation coefficient is up to 0.96; for scintillation power spectrum, the maximum frequency SH tested is 15 Hz higher than that of PMT when it is 200℃ influenced by noise; through the analysis of ShackHartman subaperture scintillation power spectrum, the scintillation power spectrum is not able to be measured precisely and different subapertures accomplish the measurement turbulence uniformity when the same subaperture incident intensity is not in the CCD response linear interval. The results will provide an optimal test method and theoretical basis for turbulence cell.
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JING Wenbo, ZHAO Si, FU Qiang, WANG Xiaoman, JIANG Huilin. Turbulence Characteristics Optical Test Contrast[J]. Acta Photonica Sinica, 2012, 41(7): 805
Received: Dec. 7, 2011
Accepted: --
Published Online: Aug. 31, 2012
The Author Email: Wenbo JING (wenbojing@sina.com)