在基于机器视觉的原棉异纤维检测系统中，选择能满足检测系统的光源和照明方案是提高系统检测率和检出率的关键，使检测对象尽可能多地显现出特征信息。选用单芯片InGaN(蓝)/YAG荧光粉型白光LED作为照明光源，采用理论计算和非成像光学设计的方法对LED阵列的光照度分布进行了研究，并根据原棉异纤维检测系统对光源光照度的具体要求，设计出了LED正方形阵列和三角形阵列两种排列方式，并利用TracePro软件对两种阵列形式进行仿真。通过比较两种阵列形式光照度分布的结果，最终选用高光照度且均匀性好的LED三角形阵列作为原棉异纤维检测系统的照明光源，满足了机器视觉成像的要求。

Based on the cotton foreign fiber detecting system of machine vision, the success or failure of the system is decided by the good lighting source and lighting solutions, which plays a very vital role in the whole process and has the detecting targets display more characteristics. The white LED with single-chip InGaN(Blue)/YAG phosphor is chosen as lighting solutions, the theoretical analysis and non-imaging optical design are adopted to study the illumination distribution of LED square arrays, which are compared by TracePro. By comparing the results of illuminance distribution of the two ranking ways, LED triangular arrays with high illumination and good uniformity is chosen as the lighting source of the cotton foreign fiber detecting system, which can improve the quality of the machine vision imaging.