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面向皮革缺陷检测的离轴LED曲面阵列照明设计

Off-Axis LED Curved Array Lighting Design for Leather Defect Detection

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摘要

提出了一种曲面LED阵列设计方法。根据光线叠加原理,将LED排列在自由曲面上,通过曲率控制LED的出光角度。基于LED曲面阵列离轴照度分布的解析式,引入了基于模拟退火的粒子群优化算法,设定约束条件,构建均匀度评价函数,优化了LED曲面阵列的数值模型。制作出实物光源进行照度测量与缺陷检测。理论模拟和实物检测结果均显示,倾斜角度为45°,目标面与发光面面积比值为1∶0.85和1∶4时,照度均匀度分别达到91.79%和98.4%。在皮革缺陷检测中的结果表明,采用LED曲面阵列光源可凸显特定缺陷,易于图像处理,能快速准确地识别缺陷。

Abstract

A design method of curved light-emitting diode (LED) array is proposed. Based on the principle of light superposition, the LEDs are arranged on the free-form surface, and the LED light-emitting angle is controlled through curvature. Based on the analytical formula of off-axis illumination distribution of the LED curved array, a particle swarm optimization algorithm is introduced based on simulated annealing, the constraint conditions are set, a uniformity evaluation function is constructed, and the numerical model of LED curved array is optimized. A physical light source is produced for the illuminance measurement and the defect detection. Both the theoretical simulation and the real detection show that when the inclination angle is 45° and the ratios of the target surface area to the light-emitting surface area are 1∶0.85 and 1∶4,the illumination uniformity is 91.79% and 98.4%, respectively. The results for leather defect detection show that the proposed curved LED array light source can highlight specific defects, quickly and accurately identify defects, and is easy for image processing.

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中图分类号:O435

DOI:10.3788/lop56.082202

所属栏目:光学设计与制造

基金项目:江苏省研究生培养创新工程(SJCX18_0633)

收稿日期:2018-10-10

修改稿日期:2018-10-26

网络出版日期:2018-11-16

作者单位    点击查看

王德宇:江南大学理学院江苏省轻工光电工程技术研究中心, 江苏 无锡 214122
王雪琨:江南大学理学院江苏省轻工光电工程技术研究中心, 江苏 无锡 214122
于文文:江南大学理学院江苏省轻工光电工程技术研究中心, 江苏 无锡 214122
曹建军:江南大学理学院江苏省轻工光电工程技术研究中心, 江苏 无锡 214122
钱维莹:江南大学理学院江苏省轻工光电工程技术研究中心, 江苏 无锡 214122
高淑梅:江南大学理学院江苏省轻工光电工程技术研究中心, 江苏 无锡 214122

联系人作者:高淑梅(gaosm@jiangnan.edu.cn)

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引用该论文

Wang Deyu,Wang Xuekun,Yu Wenwen,Cao Jianjun,Qian Weiying,Gao Shumei. Off-Axis LED Curved Array Lighting Design for Leather Defect Detection[J]. Laser & Optoelectronics Progress, 2019, 56(8): 082202

王德宇,王雪琨,于文文,曹建军,钱维莹,高淑梅. 面向皮革缺陷检测的离轴LED曲面阵列照明设计[J]. 激光与光电子学进展, 2019, 56(8): 082202

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