基于机器视觉的快速玻璃折射率测量方法

Rapid Glass Refractive Index Measurement Method Based on Machine Vision

为实现玻璃折射率快速、高精度测量需求,提出一种基于机器视觉的玻璃折射率测量方法.推导了玻璃折射率测量数学模型,采用自准直平行光管实现传统V棱镜平行光管的功能,同时对V槽的装卡倾角进行正交性校准;双CCD结合棱镜分光实现大视场拼接,运用图像处理技术直接测量折射光线的偏折角.搭建试验样机,并与传统V棱镜折射仪和数字化V棱镜折射仪进行对比.结果表明测量精度优于±2×10-6,测量速度少于10s.测量精度和测量时间都优于前两者,对实现快速、高精度光学玻璃折射率测量具有实际意义.

A measurement method of glass refraction rate based on machine vision technology is put forward, to achieve fast and high precision measurement requirements of glass refractive index. A mathematical model for measuring the refractive index of glass, the self-collimator can realize the function of the traditional V prism collimation, which calibrate the V-slot clamping posture. The large field of stitching is achieved by dual CCD and prismatic decomposition. The angle of the refracted light is directly measured by digital image technology. Finally, the test prototype is established, which is test and verified with traditional V prism refractometer and the digital V prism refractometer in the measurement accuracy and measurement time of glass refractive index, the results show that the measurement accuracy is better than ±2×10^-6 and measurement speed is better than 10 s, Whether both the measurement accuracy and the measuring time is better than before. It has important practical significance to realize fast and high precision measurement of refractive index of optical glass.