Measurement Error of Refractive Index for Spectacle Lens

• Published in: 东华大学学报（英文版） Vol. 34; no. 4; pp. 613 - 616
• Main Author: 叶佳意 蒋伟忠 唐玲玲
• Format: Journal Article
• Language: English
• Published: College of Materials Science and Engineering, Donghua University, Shanghai 201620, China%Research Institute, Donghua University, Shanghai 201620, China 31.08.2017; Research Institute, Donghua University, Shanghai 201620, China
• Subjects: 光学常数; 光学性能; 实验数据分析; 折射率; 测量误差; 直角偏差; 眼镜镜片; 调焦精度; measurement error; refractive index; prism refractometer; spectacles lens
• ISSN: 1672-5220
• DOI: 10.3969/j.issn.1672-5220.2017.04.023

As an important optical constant of optical properties for spectacle lens,the refractive index measurement is studied using V prism refractometer. In the experiment,according to various factors inducing measurement error,the experimental results are analyzed,which include right angle deviation,contact liquid,curvature,and focusing accuracy. The study results show that focusing accuracy is the most important factor of influence for measurement,consists of contact liquid wettability,sample shape,and effective width of light transmission. In addition,the refractive index measurement is less affected by angle deviation of sample and the refractive index deviation of contact liquid. On the basis of the experimental data analysis,it is possible to relax the deviation of right angle of the sample to 1＇ or 2＇.