摘要
棱镜扫描式激光高速打孔系统广泛用于非金属薄型材料(如纸张、皮革、膏药)的打孔,其控制结构简单、可靠,打孔效率高,打出小孔密集、整洁,大大增加了材料的透气度,打孔过程中对材料的透气度进行实时在线检测也是整个打孔系统设备的一个重要部分。
文章在内容上分为激光打孔控制系统、在线检测系统和中央测控单元三部分。
打孔控制系统主要讨论了这种棱镜扫描式激光打孔系统的控制原理及设计方法,包括对控制系统的数学传递函数分析和控制参量的估算、器件工作原理及选型等;文章还着重探讨了棱镜扫描系统的光路设计和对参量的分析。
在线检测系统对光电检测透气度的原理可行性进行了论述,探讨了光电探测头的设计,根据微弱信号的相关检测理论设计各级的信号调理电路并分析其传递函数。
中央测控单元主要针对C8051单片机和CPLD芯片进行设计,分别从硬件和软件设计方面给出了具体实现方法。
最后通过实验对所设计的控制及检测系统的性能进行了验证,实验结果显示打孔控制系统性能稳定、打孔效果良好,检测系统的线性度、精度指标也较好。
Laser perforating system in high-speed prism scanning is widely used to perforate some thin nonmetal material, such as paper, leather and plaster, and so on. The system has many advantages, including simple and reliable control structure, high efficiency, dense and tidy pores after perforating. As a result the permeability of material can be greatly improved. And, it is also an important part of the laser perforating system that the permeability of material is on-line detected in time during perforating.
The thesis, first of all, spreads from the control system for laser perforating, which mainly expatiates on the control theory and the design method for the laser perforating system in prism scanning. Meanwhile it analyzes the control system’s mathematical function and control parameters, introduces the running theory of element equipments and how to choose them. Furthermore, the thesis emphatically expounds the light route design of prism scanning system and its relative parameters.
Then, in the chapter of the on-line detecting system the thesis discusses the feasibility of detecting permeability in a photoelectric detector and how to devise the detector. The following contents are about the design of signal processing circuits based on the correlative detection theory of faint signal, and analyse their mathematical functions.
The third part is the project of the center controlling and detecting unit which is grounded on the C8051 singlechip and a CPLD(complex programming logic device) chip, and the thesis presents the implementing method from its hardware and software .
Lastly, the experiment evaluates the performance of controlling and detecting system. The result of experiment proves that the stability of control system and the perforating effect are excellent, and the linearity and precision of detecting system are good.
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