确定透镜焦面的系统设计 第2页
步进电机控制程序：
MOV DPTR，#adr3:8253 控制口 LOOP：INC DPTR
MOV A，#35H ：T0模式二 MOV A，@R0
MOVX@DPTR,A MOVX@DPTR,
A
MOV A,#75H :T1模式二 INC R0
MOVX@DPTR,A MOV A,@R0
MOV A,#OB3H :T2模式一 MOVX @DPTR
A
MOVX@DPTR，A INC R0
MOV DPTR #adr 0-1 DJNZ R7 LOOP
MOV R7，#03H RET
电机运行子程序：
SETB P1.1（CLR P1.1）；决定电机运行方向
CLR P1.0
LCALL YSH：延时10ms:产生负脉冲，使电机启动
SETB P1.0
RET
The design to the system of determining lens focal plane
Lens focal focus is the important parameter to determine the relation of object-image. At the same time, whether the focus of lens is precise or not will directly influence the whole lens of optics system. In order to accurately measure the focus of lens, the position of focal plane must be firstly determined. In traditional methods which are full of error and lack of efficiency, the focal plane is interpreted. To avoid these shortcomings of traditional methods and achieve the auto-measurement of focal plane, based on the measured focal length of lens of light-utensil seat, the phenomenon of eyes used as the receiver was replaced by linear CCD. And based on the theory of point spread function, the automatic measurement system was designed. The system design of the complete procedures of measure focal plan and a computer- step motor interface circuit and complete step motor control procedures. This system can analyze data acquisition from CCD by computers and send results to step motors thus driving CCD to realize fast and
accurate determination to lens plane.
KeywordS: CCD； Focal plane； Technique for Focal Plane； step motor；
确定透镜焦面的系统设计 第2页
透镜的焦距是确定其物象关系的重要参数，同时透镜的焦距是否精确将直接影响整个光学系统的焦距。而要精确测量焦距，必须先准确地检测出焦面的位置。传统的检焦方法是用人眼对焦面进行判读，这种方法误差大，效率低。为了避免传统方法的这些缺点，并且实现透镜焦面的自动检测，在原来光具座测量透镜焦距的基础上，用线阵CCD代替人眼作为接收器，设计一套基于点扩散函数理论的自动检焦系统。该系统设计了完备的检焦程序，并设计了电脑和步进电机的接口电路，另外设计了完备的步进电机控制程序。该系统利用计算机对CCD采集的数据进行分析，并将结果发送给步进电机，进而驱动CCD以实现对正透镜焦面快速准确的检测。
关键词：CCD ；焦面； 焦面判读；步进电机；
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