拼接CCD靶面温度控制系统
文献类型：学位论文
| 作者 | 黄善杰 |
| 学位类别 | 硕士 |
| 答辩日期 | 2010-06-07 |
| 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 | 许骏 |
| 关键词 | 拼接CCD 杜瓦瓶 暗流电噪声 温度控制 PID控制 |
| 学位专业 | 天文技术与方法 |
| 中文摘要 | CCD作为新一代的图像传感器，广泛应用于天文观测领域。CCD探测器的暗电流噪声是影响天文观测成像质量的一个重要因素。暗电流噪声对温度敏感，为了提高成像质量，需要对CCD致冷。目前最常用的CCD制冷方式是半导体制冷和液氮制冷。云南天文台拼接CCD项目采用的是液氮制冷方式，使用的制冷装置是液氮杜瓦瓶。 CCD制冷后，暗流会变得很小。但制冷后温度波动导致的暗电流噪声起伏是它本身的百分之几至百分之几十，为了进一步提高天文观测成像质量，我们不但要求对CCD进行致冷，而且要求有高精度温度控制，这在高精度的天文观测，特别是低光度暗星的高精度观测中尤为重要。同样的道理，云南天文台的拼接CCD也需要高精度的温控系统。本文设计的温度控制系统就是专门针对拼接CCD靶面的高精度温度控制系统。 本文首先介绍了CCD及其温控要求，然后结合拼接CCD冷板和液氮杜瓦瓶的的实际环境，对冷板温控经行了初步的热控设计分析并得出结论。接着介绍了拼接CCD靶面温控系统硬件和上下位机软件的设计，然后在实际试验中反复调试，得出最适合拼接CCD冷板的的温控算法模式。最后总结了系统的工作进度和研究展望。 |
| 英文摘要 | As a new generation of image sensors, CCDs are widely used in the field of astronomical observation.CCDs'dark current significantly affect the image quality of astronomical observations. Dark current is sensitive to the temperature. In order to improve the image quality, we need to refrigerate CCD. The general methods of CCD cooling are semiconductor cooling and liquid nitrogen cooling.The CCD butting project of Yunnan Observatory is cooled by liquid nitrogen method, cooling equipment is Dewar. After CCD cooling, dark current will become very small. However, after cooling dark current fluctuations caused by temperature fluctuations is between a few percent of itself to dozens of percent. In order to further improve the image quality of astronomical observations, we not only require for cooling CCD, but also have a high-precision temperature control , which is particularly important in high-precision astronomical observations, especially low-luminosity high-precision observations of the dark star. By the same token, the CCD butting project of Yunnan Observatory also require high-precision temperature control system. This temperature control system is designed specifically for CCD butting target surface . This paper firstly introduces the CCD and the temperature control requirements, and then combined with CCD butting cold plate and the Dewar of the physical environment,gives preliminary design and analysis of cold plate thermal control and draws the conclusions. Secondly, this paper presents the hardware and software design of upper and lower computer of CCD butting target surface temperature control system. then finds the most suitable method for cold plate temperature control algorithm of CCD butting by debugging over and over again in the real tests. Finally, sums up the progresses of the system and gives prospects for future research. |
| 学科主题 | 天文学 |
| 语种 | 中文 |
| 页码 | 69 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4893]  |
| 专题 | 云南天文台_抚仙湖太阳观测站 |
| 推荐引用方式 GB/T 7714 | 黄善杰. 拼接CCD靶面温度控制系统[D]. 北京. 中国科学院研究生院（云南天文台）. 2010. |
入库方式： OAI收割
来源：云南天文台
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