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高精度工作台控制系统是现代自动显微系统的重要组成部分,其精度直接影响显微镜对样品的检测质量。介绍了一种基于AT89C52单片机的显微镜工作台闭环控制系统的设计方案。工作台移动时作为检测元件的光栅输出脉冲信号。单片机控制电路实现脉冲的计数并计算误差值,控制步进电机进行反馈补偿。步进电机通过细分驱动模块可以以四种不同的步距驱动工作台移动,以实现显微镜对工作台移动速度的不同需要。8位数码管实时显示工作台移动的实际位置。实验结果表明,该系统的重复定位精度可达到0.020mm,可满足显微镜对控制工作台的要求。
High-precision workbench control system is an important part of modern automatic microscopy, the accuracy of which directly affects the quality of microscopy sample. This paper introduces a design scheme of closed-loop control system of microscope stage based on AT89C52 microcontroller. When the workbench is moving, the grating as a detecting element outputs a pulse signal. SCM control circuit to achieve the pulse count and calculate the error value, control stepper motor feedback compensation. The stepper motor drives the stage to move in four different pitches by subdividing the drive module to achieve the different needs of the microscope for the stage’s movement speed. 8-bit digital tube real-time display table move the actual location. Experimental results show that the repeatability of the system can reach 0.020mm, which can meet the requirements of the microscope on the control table.