基于H∞滤波的异纤光电信号检测

针对纺织企业中异纤难以检测的问题，提出了一种采用单个绿色调制光源、三个硅光电池规则排列检测异纤和纱疵的方案，通过对硅光电池接收到的反射和透射信号进行对比，分析纱线颜色和直径的变化，判断纱线是否存在异纤和纱疵。并建立了数学模型，基于H∞滤波方法采用MATLAB软件进行了仿真实验。结果证明，该算法对纱线表面亮度信号检测和纱线直径信号检测的信号突变更加敏感，并可跟踪异色百分比的变化，所设计的异纤和纱疵检测方案切实可行，H∞滤波算法可以有效提高异色疵点和粗细节疵点的检测精度。

Optical signal detection of foreign fiber based on H∞ filter

To solve the problem of detecting foreign fiber in the textile enterprises, a technical solution was put forward in which a single green modulated light and three silicon photocells regularly arrayed were adopted. It can detect foreign fiber and yarn faults by means of contrasting the reflection and transmission signals received by the silicon photocells and analyzing the color and diameter change of yarn. The mathematical model was established, and the simulation experiment was done based on H∞ filter using software MATLAB. The results proved that the algorithm was more sensitive to signal singularity of the surface brightness signal and the diameter signal of yarn, which can also track the percentage change in color. It is further confirmed that the scheme of detecting foreign fiber and yarn faults is feasible, the H∞ filter algorithm can effectively improve the detection precision to foreign fiber and yarn faults.