【摘要】 针对野外测量弹丸速度的高空大靶面天幕靶实际应用存在天空照度过亮时的影响问题 ,提出采用可调光阑的解决方案 ,利用 AT89C2 0 5 1与 A DC0 80 9的 A /D转换器、步进电机相结合的电路控制可调光阑达到解决天空过亮的测量问题 ;介绍 AT 89C2 0 5 1的性能特点与 ADC0 80 9的 A /D转换基本原理 ,详细介绍实现 ADC0 80 9的 A /D转换与 2 8BYJ0 1A步进电机控制的电路设计 ,并简述实现控制整体电路的软件设计。更多还原

【Abstract】 Sky screen is an instrument that is used to measure the velocity of projectile in the field. The brightness of the sky affects sky screen normal work, aim at this question, adjustable diaphragm is used in order to eliminate the effect of the brightness of the sky. Design the control circuit to adjust adjustable diaphragm for adapting sky screen works. AT89C2051 is the core the whole control circuit; ADC0809 and stepmotor are a part of control circuit. In this paper, Introduces the design of the control circuit, the function of AT89C2051 and ADC0809, and the software design of the circuit.更多还原