摘要
本文针对客观暗适应检查仪的具体指标要求,设计了客观暗适应检查仪的调光系统,设计了硬件电路和软件。该系统以ATmega 64单片机作为整机监测和控制的核心,完成了光强度标定、自适应调光等功能,当光强超出允许范围时,系统将产生报警信号,并在显示器上显示"亮度不正常",调光控制器通过PWM脉宽调制将光强自动调整至正常范围内,保证仪器正常运行。试验结果表明该系统具有稳定性好、抗干扰能力强等特点。
The light adjusting system of objective dark-adapted examining instrument is devised, and hardware circuit and software are put forward to achieve technique demands of the system. ATmega64 single chip computer is the kernel of the whole surveillance and control. It not only detects brightness, but also modulates brightness automatically. When the brightness is beyond permitted range, the instrument will sound the alarm and show ＂Brightness is abnormal＂. To ensure the normal working of the instrument, the chip computer will regulate the brightness to the normal range by pulse width modulation technology. Experiment results prove that it has the characteristics of good stability and strong immunity and etc.
出处
《微计算机信息》
2009年第4期113-115,共3页
Control & Automation
关键词
暗适应
AVR单片机
光强标定
自动调光
PWM脉宽调制
dark-adaptation
AVR Single chip computer
intensity demarcating of light
modulates brightness automatically
pulse width modulation
