摘要
为满足面阵CCD航空相机获得清晰图像的需要,设计了一种以数字处理芯片TMS320F2812为核心的调光控制器。该系统由检光电路和调光控制电路组成,使用集成光敏二极管芯片OPT301M为检光元件;利用模数转换器AD7865将模拟量转换为数字量,直流电机控制单帘幕快门帘缝速度,光电编码器反馈速度信号,并由可编程逻辑器件EPM7128完成逻辑运算与电平转换;系统的程序设计是在DSP开发环境CCS下完成的,程序简单可靠,算法容易实现。实验表明,在180r/min的阶跃输入信号下,调节时间为0.095s,最大超调量为7.2%,速度误差为1.08r/min,特性参数满足性能指标的要求。
In order to acquire clear images by an area CCD aerial camera, an automatic light adjustment and control system is designed by using a digital signal processor TMS320F2812 as the core light adjustment con- troller . The control system consists of a light detection circuit and an adjusting and controlling circuit, in which the integrated photodiode and amplifier OPT301M is worked as a light detecting device. Otherwise, an A/D converter AD7865 is used to convert an analog signal to a digital signal, a direct circuit motor is used to control the curtain type shutter speed, and the programmable logic device EPM 7128 is taken to realize the logic operation and electric level conversion. Moreover, the programming design is implemented based on a CCS in the DSP environment by a simple way. The experiment results show that the adjustable time is 0. 095s, speed error is 1.08 r/min, and the over-adjustment is 7.2% in an input step signal of 180 r/rain, which meets the requirements of system specifications.
出处
《中国光学与应用光学》
2009年第4期340-345,共6页
Chinese Optics and Applied Optics Abstracts
基金
国家863高技术研究发展计划资助项目(No.2007AA701203)
