光电检测系统中弱信号的检测

Measure and Test of Weak Signal in the Photoelectric Detecting System

整经机上丝线的毛刺、打结等 ,采用了光电式检测技术 ,但由于丝线运行速度快、有抖动 ,运行环境的光、电干扰较强 ,毛刺在输出端产生的信号变化甚小。为提高弱信号检测的灵敏度 ,采用了动态检测、降低电路噪声和双重判断等措施 ,有效地降低了系统的误检率 ,提高了系统的可靠性。

Photoelectric detecting technology has been adopted to check to see if there are faults, knots etc. in the threads on the warping machine. Then, the signal to show the evidence of faults is not obvious but weak at the terminal because of the threads' rapid movement, vibration and of the strong light and electric interference in the site. In order to strengthen the sensitivity of weak signal in detection, measures such as dynamic detection, reduction of circuit noise, dual judgment, etc. are employed, thus the system's false ratio in detection is greatly decreased while its reliability is improved.