Study on adaptive exposure time for low-light staring imaging

	Study on adaptive exposure time for low-light staring imaging
	Wang, Y.-M.; X.-B. Yang; G. Jin; W. Xu and Z. Zhang
	2016
发表期刊	Guangzi Xuebao/Acta Photonica Sinica
卷号	45 期号:12
摘要	To improve the wavefront detection accuracy of a liquid crystal adaptive optical system, a correction method for the Tip/Tilt Mirror(TTM) in the liquid crystal adaptive optical system was researched. The physical characteristics of each ingredient in the adaptive optical system were analyzed, and the basic structure of the TTM model was given based on the Lagrange equation. Then, the model parameters were acquired by using modified subspace identification method, and the frequency domain characteristics of a subspace model were corrected by nonlinear least squares algorithm. After correction, the transfer function precisions are 0.024 5 dB for the amplitude and 1.900 8 for the phase in middle and low frequency domains. Furthermore, Smith predictor was introduced to solve the time delay problem during TTM correction. The model obtained by space identification was used in the simulation and experimental verification by Smith and PID. The experiment result is coincided with simulation result. It is shown that PID with the Smith predictor is superior to traditional PID, and the error residual bandwidth of Smith predictor is enhanced by 23.97% as compared with that of the traditional PID. Finally, a signal of turbulence Tip/Tilt was generated for a correction experiment, and the experimental result shows that the control precision of PID with Smith predictor is improved by 21.03% compared with that of traditional PID, which verifies that the proposed method optimizes the correction accuracy of the TTM and ensures the wavefront detection accuracy of the liquid crystal adaptive optical system. 2016, Science Press. All right reserved.
文章类型	期刊
收录类别	EI
语种	中文
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/57269
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Wang, Y.-M.,X.-B. Yang,G. Jin,et al. Study on adaptive exposure time for low-light staring imaging[J]. Guangzi Xuebao/Acta Photonica Sinica,2016,45(12).
APA	Wang, Y.-M.,X.-B. Yang,G. Jin,&W. Xu and Z. Zhang.(2016).Study on adaptive exposure time for low-light staring imaging.Guangzi Xuebao/Acta Photonica Sinica,45(12).
MLA	Wang, Y.-M.,et al."Study on adaptive exposure time for low-light staring imaging".Guangzi Xuebao/Acta Photonica Sinica 45.12(2016).

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