Acta Photonica Sinica, Volume. 46, Issue 1, 111001(2017)
Application of Phase Diversity Wave-front Sensing Technique to Large Space-borne Camera
Based on the fundamental principle of phase diversity technique, a prototype space-borne camera was used to experimentally demonstrate the effects of wavefront reversal of phase diversity technique through laboratory and outfield push-broom imaging experiments. Experimental results demonstrate that, the accuracy of wavefront reversal based on phase diversity technique is near 1/40λ(λ=632.8 nm)by using the root-mean-squares of residual wave-front errors between the really obtained wave-front through Zygo and the calculated wave-front through phase diversity as a criterion. At the same time, by carrying out deconvolution to the degraded push-broom images using the estimated wave-front, the image quality could be prominently improved. The signal-to-noise ratio could be improved at least 40% and the modulation transfer function at Nyquist frequency could be improved 80% above, which indirectly proves the effectiveness of phase diversity technique as well. The work reported in this manuscript will pave the way for in-orbit application of phase diversity based wave-front sensing technique in future.
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ZHAO Hui, YI Hong-wei, FAN Xue-wu, LI Chuang, ZOU Gang-yi, PANG Zhi-hai, REN Guo-rui, ZHAO yan, LI Ai-ling, WEI Jing-xuan, XIE Xiao-peng. Application of Phase Diversity Wave-front Sensing Technique to Large Space-borne Camera[J]. Acta Photonica Sinica, 2017, 46(1): 111001
Received: Jul. 21, 2016
Accepted: --
Published Online: Feb. 9, 2017
The Author Email: Hui ZHAO (zhaohui@opt.ac.cn)