近地面大气湍流特性的研究
文献类型：学位论文
| 作者 | 周丹 |
| 学位类别 | 硕士 |
| 答辩日期 | 2002 |
| 授予单位 | 中国科学院研究生院（云南天文台） |
| 授予地点 | 北京 |
| 导师 | 刘忠 |
| 关键词 | 大气湍流 折射率结构常数 视宁度参数 曝光时间 温度差 |
| 其他题名 | Characteristics of the Near-ground Atmospheric Turbulence |
| 学位专业 | 天体物理 |
| 中文摘要 | 本论文首先从天文选址的角度详细地介绍了大气湍流的成因，光在大气湍流中的传播理论，讨论了描述像质衰减程度的参量-视宁度参数以及测量视宁度参数的方法。此后对大气与地面介质之间的温度差是影响近地面湍流特性的主要原因做了论述。本文给出了在像运动法测量中视宁度参数和曝光时间之间的关系：曝光时间必须小于大气相干时间，否则测量的视宁度参数值将偏大，并设计了一种实验方法来测定视频CCD的曝光时间，实验的结果表明这种方法是可靠的。在研究介质温度差对近地面湍流特性影响的实验中给出了抚仙湖址点大气水面温度差与近地面水平方向视宁度参数，近地面折射率结构常数之间的关系曲线，得到了一些有意义的结果。 |
| 英文摘要 | From the astronomy site-testing point of view, this paper first explained in detail the origin of atmospheric turbulence and the optical propagation theory of in atmospheric turbulence. The descriptive parameter to the degradation of the astronomical image quality, seeing parameter, was discussed, as well as its survey techniques. It was then elaborated that the temperature difference between atmospheric and the ground medium was the main factor affecting the characteristic of the near-ground atmospheric turbulence. This paper stated the relationship between seeing parameter and exposure time in the image motion method measuring the seeing parameter, that is, the exposure time must be shorter than the atmospheric coherent time, otherwise the measured seeing parameter value would be artificially larger. An experimental method was designed to determine the exposure time of Video CCD, and it was demonstrated to be reliable. Experiments were conducted to investigate the influence of medium u-reperature difference to the near-ground atmospheric turbulence. As significant results, the relational curves were obtained to quantitatively provide the dependency of atmosphere water surface temperature difference at the Fuxian Lake site upon the near-ground horizontal seeing parameter and the near-ground refractive index structure parameter. |
| 学科主题 | 天文学 |
| 语种 | 中文 |
| 公开日期 | 2016-05-03 |
| 页码 | 60 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5540]  |
| 专题 | 云南天文台_丽江天文观测站（南方基地） |
| 推荐引用方式 GB/T 7714 | 周丹. 近地面大气湍流特性的研究[D]. 北京. 中国科学院研究生院（云南天文台）. 2002. |
入库方式： OAI收割
来源：云南天文台
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