激光分拣系统的设计和改进(英文)  

Design and improvement of laser sorting system

作　　者：叶莉华[1] 王文轩[1] 吕聪生[1] 汪海洋[1] 崔一平[1] 杭建军[1] 

机构地区：[1]东南大学电子科学与工程学院先进光子学中心,江苏南京210096

出　　处：《红外与激光工程》2014年第9期2878-2882,共5页Infrared and Laser Engineering

基　　金：江苏省企业研究生工作站合作项目

摘　　要：相机分拣机常用于食品和非食品分拣,如炸薯条、虾、蔬菜、小吃、棉花、塑料等。但有些看不见的异物(如玻璃)或与产品颜色相同的异物是无法由相机检测到的。而激光扫描系统则可用于检测与产品颜色相同的异物。设计和改进了基于选择性吸收原理的激光分选系统,并对系统进行了高速信号采样实验以及成像实验。在信号采样实验中,系统可以通过选择性吸收分选技术有效识别产品和异物。在成像实验中,选择报纸的标题作为成像样图,调整扫描光斑直径接近0.35 mm,扫描后的数据经由计算机程序转码并成像。实验成像的分辨率为180×43 pixel。成像结果表明,系统可以有效地识别1.5 mm的异物。最后对光学扫描系统进行了分析,发现部分的光信号损失于扫描光的非垂直入射,于是提出了曲线扫描分拣结构用以改进传统分拣系统。Camera sorters are used both for food and non-food applications like french fries, shrimps, vegetables, snacks, raw cotton, plastics, etc. But invisible foreign bodies, such as glass, or defects with exactly the same color as the product may not be detected. So the laser scanning system is used for detecting defects when the products and the defects have the same color. A laser sorting system is designed and improved based on the selective absorption principle. And a high-speed signal sampling experiment and a imaging experiment for the system were tested. By the selective absorption sorting technology, both products and foreign bodies were identified efficiently in the signal sampling experiment. The headline in the newspaper was selected as the imaging experimental sample and the diameter of scanning spot was adjusted close to 0.35 mm. The scanning data recorded through computer program was imaged by software. The resolution of the experimental result is 180＊43 pixel. Imaging results illustrate that defects （1.5 mm） can be recognized accurately. Finally, after optical scanning system was analyzed, the phenomenon was found that most of the flux was lost due to the non-perpendicular illumination of the sample. A curve scanning sorting structure was proposed for improving traditional sorting system.

关 键 词：激光扫描 共光路成像 光电探测 异物识别 

分 类 号：O433.1[机械工程—光学工程]