High signal-to-noise ratio sensing with Shack-Hartmann wavefront sensor based on auto gain control of electron multiplying CCD

	High signal-to-noise ratio sensing with Shack-Hartmann wavefront sensor based on auto gain control of electron multiplying CCD
	Zhu, Z. Y.; D. Y. Li; L. F. Hu; Q. Q. Mu; C. L. Yang; Z. L. Cao and L. Xuan
	2016
发表期刊	Chinese Physics B
卷号	25 期号:9
摘要	High signal-to-noise ratio can be achieved with the electron multiplying charge-coupled-device (EMCCD) applied in the Shack-Hartmann wavefront sensor (S-H WFS) in adaptive optics (AO). However, when the brightness of the target changes in a large scale, the fixed electron multiplying (EM) gain will not be suited to the sensing limitation. Therefore an auto-gain-control method based on the brightness of light-spots array in S-H WFS is proposed in this paper. The control value is the average of the maximum signals of every light spot in an array, which has been demonstrated to be kept stable even under the influence of some noise and turbulence, and sensitive enough to the change of target brightness. A goal value is needed in the control process and it is predetermined based on the characters of EMCCD. Simulations and experiments have demonstrated that this auto-gain-control method is valid and robust, the sensing SNR reaches the maximum for the corresponding signal level, and especially is greatly improved for those dim targets from 6 to 4 magnitude in the visual band.
文章类型	期刊
收录类别	SCI ; EI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/57499
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Zhu, Z. Y.,D. Y. Li,L. F. Hu,et al. High signal-to-noise ratio sensing with Shack-Hartmann wavefront sensor based on auto gain control of electron multiplying CCD[J]. Chinese Physics B,2016,25(9).
APA	Zhu, Z. Y.,D. Y. Li,L. F. Hu,Q. Q. Mu,C. L. Yang,&Z. L. Cao and L. Xuan.(2016).High signal-to-noise ratio sensing with Shack-Hartmann wavefront sensor based on auto gain control of electron multiplying CCD.Chinese Physics B,25(9).
MLA	Zhu, Z. Y.,et al."High signal-to-noise ratio sensing with Shack-Hartmann wavefront sensor based on auto gain control of electron multiplying CCD".Chinese Physics B 25.9(2016).

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