基于双阿米西棱镜的光谱成像系统设计

Design of spectral imaging system based on double Amici prism

为解决棱镜分光式光谱成像系统存在的直视性差、分光线性度低、固有谱线弯曲较大的问题,提出了基于双阿米西棱镜的光谱成像系统。通过矢量折射定律,运用MATLAB编程实现棱镜谱线弯曲的精确计算,并进行了仿真验证。在研究双阿米西棱镜谱线弯曲特性的基础上,搭建直视型消谱线弯曲双阿米西棱镜作为分光元件,设计得到的光谱成像系统工作波段为400~800nm,全波段光谱分辨率高于7nm。在中心波长600nm处,中心视场主光线经双阿米西棱镜后的出射光线与光轴夹角小于0.31°,全波段谱线弯曲最大值小于2.557μm。系统满足直视性和消谱线弯曲的要求,方法对消谱线弯曲棱镜光谱成像系统的设计具有普适性的指导意义。

In order to solve the drawbacks of the prism spectral imaging system,such as poor direct vision,low spectral linearity and large natural smile,a spectral imaging system based on double Amici prism is proposed.MATLAB software is used to realize the accurate calculation of the prism smile based on vector refraction law,which has been verified by simulation.On the basis of studying smile characteristics of double Amici prism,and as the dispersive element,a direct vision double Amici prism with smile eliminated is built.The wave band of the designed system is 400 nm to 800 nm,and the spectral resolution in the full waveband is higher than 7 nm.At the central wavelength of 600 nm,the angle between the chief ray of the center view refracted by double Amici prism and the optical axis is less than 0.31°.Moreover,the maximum value of the smile in the full waveband is less than 2.557μm,which can meet the requirements of direct vision and eliminating smile.It’s of general guiding significance to the design of prism spectral imaging system with smile eliminated.