在很多测量方法中都需要一个具有足够小的扫描步长，以保证能够获得足够的光谱分辨率。
In many measurements, a short enough scanning step is required to acquire an adequate spectrum resolution.
该方法通过采用变步长和扫描面的处理方法，提高了计算效率。
The strategies of changeable step and swept surface are applied to improve the calculating efficiency of the method.
利用AT89C52单片机控制两台步进电机，通过RS232总线进行上位机（PC）与下位机（AT89C52）的通讯，可方便地进行步进电机扫描方式、转速、步长和方向的设置，实现了对步进电机的精确控制。
The communication between PC and the AT89C52 chip is achieved through the RS232 bus, so scanning mode, rotate speed, step and direction of step motor are setup expediently.
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