基于Catmull-Rom插值算法光栅分辨率测试系统改进  

The Improvement of Grating Resolution Testting System Based on Catmull-Rom Interpolation Algorithm

作　　者：杨海马[1,2] 王光斌[1] 张亮[2] 苏仰庆 黄元申[1] 张大伟[1] 马贤淑 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093 [2]中国科学院上海技术物理研究所,上海200083

出　　处：《传感技术学报》2015年第8期1136-1140,共5页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金青年基金项目(61302181);上海市教委科研创新项目(13YZ111);上海市自然科学基金项目(14ZR1418400)

摘　　要：为了减小探测器采集及软件处理导致的系统误差,提高光栅分辨率检测精度,利用半宽度法设计了一套满足李特洛条件的阶梯光栅分辨率检测系统。搭建了系统的光路,介绍了提高分辨率的方法,重点分析了探测器像元尺寸对系统分辨率测试精度的影响,提出了在Lab VIEW软件中如何根据离散光谱信号并利用Catmull-Rom插值构造出连续光谱,提高半宽度法检测的精度。实验结果表明,在高分辨率测试系统中,通过软件算法对离散信号进行拟合分析,能有效的解决由像元尺寸造成的系统误差。In order to reduce the system error caused by detector acquiring and software processing,and improve the accuracy of echelon grating resolution,a resolution detection system which satisfied Littrow condition was designed by using the half wave width method. The optical structure of the detection system was built and the improved detection method was introduced. Then the grating resolution influenced by detector pixel size was analyzed. By using Catmull-Rom interpolation algorithm to fit a continuous spectral curve,the accuracy of half wave width according to the discrete spectrum was improved in LabVIEW. The experimental result also showed that the system error caused by pixel size can be effectively reduced by fitting analysis of discrete signal in the high resolution testing system.

关 键 词：光栅 分辨率检测 插值算法 光谱曲线 

分 类 号：O433.1[机械工程—光学工程]