基于DSP的光学膜厚监控系统设计

Design of Optical Film Thickness Monitoring System Based on DSP

为了提高国产镀膜机自动化程度以获得高性能的光学薄膜,需要在镀膜系统中引入微机控制单元,控制部分包含信号调理、数据采集、数据处理和反馈系统,整体监控界面采用VC++6.0编写,收集数据采集卡实时采集到的反映膜厚变化的数据,传递给DSP芯片进行实时数据处理,实现各种需要的算法处理,将运算结果提供给反馈单元进行自动控制;经过改造,国产镀膜机极大地提高了自动化程度,但实现的算法还比较简单,还不能准确判断极值点,需要进一步改进。

in order to improve the automatization character of the homemade film coating machine,to obtain better optical film,the controlling by microcomputer unit is needed,the controlling part includes signal conditioning ,data collection,data processing and feedback system.in this system,adopting the VC＋＋ software to edit the monitoring interface,the real time data about the film thickness is collected by the data acquiring card and is transferred to the DSP chip to accomplish the necessary smart algorithms and obtain a result,the result can be adopted to accomplish the automata.by doing so,the homemade machine offers a much better performance,but the algorithms accomplished is still simple,the extremum point still can＇t be anticipated,the more improvement is still needed.