论文部分内容阅读
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。
In order to overcome the interference of external light, the photodetection circuit is composed of a phase-locked loop chip LM567, which modulates the light intensity of the light-emitting tube and discriminates the electrical signal of the light-receiving tube so as to effectively improve the light- Anti-interference ability. The introduction of single-chip computer to adjust the digital potentiometer to change the light intensity LED, LM567 to get a stable output signal and improve the reliability of detection.