纬纱红外光电检测方法与可靠性

 在纺织生产中，气流引纬的纬纱光电检测误检测率较高。本文对纬纱信号的检测处理的一般方法作了较完整的分析，指出纬纱信号的波动与增益放大电路与阀值比较电路的可调电阻的阻值成正态分布，是造成检测可靠度不高的主因。并对可能产生的误判原因进行了分析，给出了改进方法。通过实验，说明纬纱信号的增益过饱和和欠饱和是造成误判的主要原因，对于数字处理方式和模拟方式进行的纬纱信号处理，在放大电路采用增益自动调节的运算放大器是提高检测率的重要手段。

Study of methods and reliability of weft signal detection with infrared photoelectric sensor

In the whole process of textile manufacturing, the weft error detection rate of optoelectronic measuring method is higher. this paper analyzed the general method of weft signal detection processing, it pointed out that the fluctuate of weft signal and the resistance value of the adjustable resistance on the gain amplifying circuit and threshold comparison circuit are normally distributed ,which were the main factors that cause the test is low reliability. A failure analysis of weft detection was presented, and this paper presented four improved methods. Through the experiments, the results showed the major reasons for weft error detection were upper-saturation and under-saturation of the weft signal gain. For the wefts signal processing between digital processing mode and Analog circuits mode, the important way to improve the detection rate was adopted VGA IC in the amplifier circuit.