摘要
采用对射式光电检测方法,为克服外界光的干扰,采用锁相环芯片LM567组成光电检测电路,对发光管的光强进行调制、对光电接收管的电信号进行鉴频,从而有效提高了抗干扰的能力。引入单片计算机调节数字电位器改变发光管的光强,使LM567得到稳定的输出信号,提高了检测的可靠性。
Opposite photoelectric detecting is adopted.In order to overcoming interference from outside light,PLL chip LM567 is used in photoelectric detecting circuit.Light intensity of LED is modulated and signal of photoelectric receiver is demodulated to enhance the anti-interference ability.Single chip computer is used to change digital resistor to regulate the light intensity of LED,which lets LM567 output stable demodulation signal to improve detecting reliability.
出处
《煤炭技术》
CAS
北大核心
2010年第11期35-36,共2页
Coal Technology
关键词
黏度计
光电检测
锁相环
单片机
viscosimeter
photoelectric detection
phase lock loop
single chip computer
