Cone Effect in Astronomical Adaptive Optics System Investigated by a Pure Numerical Simulation
文献类型：会议论文
| 作者 | Yan HX(严海星) ; Wu HL(吴晗玲); Li SS(李树山); Chen S(陈涉); Yan HX(严海星)
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| 出版日期 | 2005-06-01 |
| 会议名称 | Astronomical Adaptive Optics Systems and Applications II, August 03,2005 - August 04,2005 |
| 会议日期 | August 03,2005 - August 04,2005 |
| 会议地点 | San Diego, California, USA |
| 卷号 | 5903 |
| 通讯作者 | 严海星 |
| 中文摘要 | It is well-known that cone effect or focus anisoplanatism is produced by the limited distance of a laser guide star (LGS) which is created within the Earth atmosphere and consequently located at a finite distance from the observer. In this paper, the cone effect of the LGS for different vertical profiles of the refractive index structure constant Cn2 is numerically investigated by using a revised computer program of atmospheric propagation of optical wave and an adaptive optics (AO) system including dynamic control process. According to the practice, the overall tilt for the tilt-correction mirror is obtained from a natural star and the aberrated wavefront for phase correction of the deformable mirror is obtained from a LGS in our numerical simulation. It is surprisingly found that the effect of altitude of the LGS on the AO phase compensation effectiveness by using the commonly-available vertical profiles of Cn2 and the lateral wind speed in the atmosphere is relatively weak, and the cone effect for some Cn2 profiles is even negligible. It is found that the cone effect does not have obvious relationship with the turbulence strength, however, it depends on the vertical distribution profile of Cn 2 apparently. On the other hand, the cone effect depends on the vertical distribution of the lateral wind speed as well. In comparison to a longer wavelength, the cone effect becomes more obvious in the case of a shorter wavelength. In all cases concerned in this paper, an AO system by using a sodium guide star has almost same phase compensation effectiveness as that by using the astronomical target itself as a beacon. Effect of dynamic control process in an AO system on the cone effect is studied in this paper for the first time within our knowledge. |
| 会议网址 | http://dx.doi.org/10.1117/12.616110 |
| 会议录 | Astronomical Adaptive Optics Systems and Applications II
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| 学科主题 | 力学 |
| 语种 | 英语 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/13908]  |
| 专题 | 力学研究所_力学所知识产出(1956-2008) |
| 通讯作者 | Yan HX(严海星) |
| 推荐引用方式 GB/T 7714 | Yan HX,Wu HL,Li SS,et al. Cone Effect in Astronomical Adaptive Optics System Investigated by a Pure Numerical Simulation[C]. 见:Astronomical Adaptive Optics Systems and Applications II, August 03,2005 - August 04,2005. San Diego, California, USA. August 03,2005 - August 04,2005.http://dx.doi.org/10.1117/12.616110. |
入库方式： OAI收割
来源：力学研究所
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