基于扩展宽带光双光栅干涉的屈光度测量研究  

Research on Diopter Measurement Based on Extended Broadband optical Double Grating Interference

作　　者：李天昊 何勇[1,2] 韩志刚[2] 徐海飞[1] LI Tian-hao;HE Yong;HAN Zhi-gang;Xü Hai-fei(School of Electronic Engineering and Optoelectronic Technology,Nanjing University of Science and Technology,Nanjing,Jiangsu 210094,China;Key Laboratory of Advanced Solid Laser Industry and Information Technology Ministry,Nanjing University of Science and Technology,Nanjing,Jiangsu 210094,China)

机构地区：[1]南京理工大学电子工程与光电技术学院,江苏南京210094 [2]南京理工大学先进固体激光工业和信息化部重点实验室,江苏南京210094

出　　处：《计量学报》2023年第7期1046-1051,共6页Acta Metrologica Sinica

基　　金：国家自然科学基金(61875087)。

摘　　要：提出了一种屈光度的扩展宽带光双光栅干涉测量方法。基于Talbot效应与Moire效应理论,推导出单、复色扩展光源下干涉场强度分布公式,从而表明当光源到第一面光栅与第二面光栅到观察屏距离相等时,干涉场光强分布与光源波长无关。仿真分析了扩展光源下双光栅系统参数对莫尔条纹对比度的影响,结果表明:当系统中光源宽度选定为4 mm、光栅周期选定为0.2 mm、两光栅之间的夹角选定为1.9°、两光栅之间的空间距离选定为6.5 mm时,可以获得较好的干涉条纹对比度。构建了屈光度测量系统,对屈光度为-1 m^(-1)、-3 m^(-1)、1 m^(-1)、3 m^(-1)的镜片进行实验测量,重复测量10次,测量结果的峰谷值偏差为0.0064 m^(-1),是测量结果平均值的0.28%。实验结果表明:扩展宽带光双光栅干涉方法能实现镜片屈光度的高精度低成本测量。A diopter measurement based on the double grating system with extended broadband light is proposed.Based on Talbot effection and Moire effection,the intensity distribution formula of interference under extended monochromatic light and extended polychromatic light is derived.As it shows that if the distance from the light to the first grating and the distance from the second grating to the screen is equal,the intensity distribution of the interference won’t be related to the wavelength of the light.Besides the influence of double grating system parameters on the contrast of Moire fringe under extended light is analyzed.The results show that when the width of light is 4 mm,the grating period is 0.2 mm,the angle between two gratings is 1.9°,and the space distance between two gratings is 6.5 mm,the clear interference fringe can be obtained.A diopter measurement system is constructed to measure the lens with diopter of-1 m^(-1),-3 m^(-1),1 m^(-1) and 3 m^(-1).The peak-to-valley deviation of measurements is 0.0064 m^(-1),which is the 0.28%of the average measurement results.The experiment result shows that the lens diopter can be measured with double grating system using extended broadband light source accurately and cheaply.

关 键 词：计量学 屈光度测量 双光栅干涉 宽带光源 TALBOT效应 Moire效应 

分 类 号：TB96[机械工程—光学工程]