光学玻璃加工过程中的温度控制和粗糙度检测
文献类型：学位论文
| 作者 | 程骅 |
| 学位类别 | 硕士 |
| 答辩日期 | 2007 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 沈卫星 |
| 关键词 | 光学玻璃加工 温度控制 粗糙度检测 控制系统设计 |
| 其他题名 | Temperature Control and Roughness Testing in the Optical Glasses Processing |
| 中文摘要 | 随着现代光学科技的发展，工程实践对于光学玻璃的加工和制造提出更高的要求。目前的加工工艺对于提高光学玻璃加工精度的作用到达了极限。其本质原因是传统上的思维习惯将抛光过程简单的看为一种机械过程，并且只将Preston方程作为唯一的一种理论。抛光过程中的各个状态参量对于抛光的精度有着很大程度的影响，控制这些状态参量就能够从本质上提高玻璃的抛光精度。在这些状态参量中，以温度和粗糙度较为重要。 本文提供一种控制抛光液温度的方法，这种方法能有效控制玻璃表面的温度分布，同时也提供一种在抛光过程中实时检测玻璃粗糙度的方法。本文选择热敏电阻构成一个电桥，作为温度探测电路，并且对热敏电阻进行线性化处理，使其满足探测精度。本文选择PID控制作为主要的控制方式，主要分析存在系统大延时条件下，PID控制系统的稳定性问题，同时考虑到控制系统的模型失配和非线性效应，从理论上研究了变结构控制方式并提出了基于输出反馈的变结构控制方式，为将来将这种理论用于实时控制系统提供了理论基础。在信号处理这方面的研究中，提出一种基于小波变换的实时去噪方法。这种方法能有效得进行实时去噪。经过仿真和实验证明本文提出的方法简单可行，可以有效控制抛光液的温度和实时检测光学玻璃的粗糙度，进而提高玻璃的抛光精度。 |
| 英文摘要 | With the development of modern optical science and technology, engineering practice proposes higher requirements to the manufacturing and processing of optical glasses. The current processing technology has limited effect on the improvement of the precision of optical glasses manufacturing. The substantial reasons are that the traditional ideas simply consider polishing process as a pure machine processing and the Preston equation is thought to be the only theory for polishing process. Each state parameter has a great impact on polishing process and polishing precision can be substantially improved by controlling these state parameters. Among these state parameters, temperature and roughness are important. This dissertation presents a method for the real-time testing of the glass roughness during polishing processing and controlling the temperature of polishing slurry. This method proposed by this dissertation can efficiently control the distribution of the superficial temperature of the glass. This paper constructs a bridge using thermal resistors as the temperature detecting circuit and the thermal resistors are to be processed by linear disposal by which detecting precision can be improved. This dissertation selects the PID control arithmetic as the main method and analyzes the stability in the situation that the control system has a large time delay. Meanwhile, this paper also researches the VSC control theory with the proposal of a control arithmetic based on the MIMO systems for the consideration of the model mismatch and nonlinear effect of the control systems. It gives a theory basic for the future use of the theory in the real-time control systems. In the area of signal processing, a new real-time de-noising method using wavelet transform is proposed. By emulation and experiments, the methods proposed by the dissertation prove to be simple and feasible, which can effectively control the temperature of polishing slurry and achieve a real-time testing to the roughness of optical glasses. Then it can improve the polishing precision of optical glasses. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16570]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 程骅. 光学玻璃加工过程中的温度控制和粗糙度检测[D]. 中国科学院上海光学精密机械研究所. 2007. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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