Auto gain control of EMCCD in Shack-Hartmann wavefront sensor for adaptive optics

	Auto gain control of EMCCD in Shack-Hartmann wavefront sensor for adaptive optics
	Zhu, Z. Y.; D. Y. Li; L. F. Hu; Q. Q. Mu; Z. L. Cao; Y. K. Wang; S. X. Wang and L. Xuan
	2016
发表期刊	Optics Communications
卷号	380
摘要	Electron multiplying charge-coupled-device (EMCCD) applied in Shack-Hartmann wavefront sensor (S-H WFS) makes the wavefront sensing more efficient for adaptive optics (AO). However when the brightness of the observed target changes in large ranges in a few minutes, a fixed electron multiplying (EM) gain may not be optimum. Thus an auto-gain-control (AGC) method based on the spots image of the S-H WFS is proposed. The designed control value is the average value of the maximum signals of all the light spots in a frame. It has been demonstrated in the experiments that the control value is sensitive to the change of the target brightness, and is stable in the presence of detecting noises and turbulence influence. The goal value for control is predetermined based on the linear relation of the signal with the EM gain and the number of photons collected in sub-apertures. The conditions of the self-protection of the EMCCD are also considered for the goal value. Simulations and experiments indicate that the proposed control method is efficient, and keeps the sensing in a high SNR which reaches the upper SNR limit when sensing with EMCCD. The self-protection of the EMCCD is avoided during the whole sensing process. (C) 2016 Elsevier B.V. All rights reserved.
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/181722/57498
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. Auto gain control of EMCCD in Shack-Hartmann wavefront sensor for adaptive optics[J]. Optics Communications,2016,380.
APA	Zhu, Z. Y..,D. Y. Li.,L. F. Hu.,Q. Q. Mu.,Z. L. Cao.,...&S. X. Wang and L. Xuan.(2016).Auto gain control of EMCCD in Shack-Hartmann wavefront sensor for adaptive optics.Optics Communications,380.
MLA	Zhu, Z. Y.,et al."Auto gain control of EMCCD in Shack-Hartmann wavefront sensor for adaptive optics".Optics Communications 380(2016).

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