Sagnac棱镜对旋对光谱仪光谱分辨率影响的校正方法  

Correction Effect to Spectral Resolution of Spectrometer Caused by Counter Rotating of Sagnac Prism

作　　者：李苏宁[1] 朱日宏[1] 沈华[1] 

机构地区：[1]南京理工大学电光学院,江苏南京210094

出　　处：《中国激光》2010年第3期652-657,共6页Chinese Journal of Lasers

摘　　要：Sagnac型静态干涉成像光谱仪中,Sagnac棱镜的加工对旋误差对仪器的光谱分辨率会造成一定影响,甚至会引入虚假谱信息。为了进一步提高光谱仪的光谱分辨率以及校正虚假谱,重点推导了Sagnac棱镜在加工过程中由不对称半五角棱镜在胶合过程中产生的对旋误差与由该误差而引起的棱镜剪切量变化之间的关系,分析了对旋误差对光谱仪重构光谱的影响,提出了采用Forman卷积法对该影响进行校正的方法。采用氢灯进行实验,结果表明,该校正方法对虚假谱的抑制作用明显,且可显著提升光谱分辨率。In the Sagnac static imaging spectroscopy,there would be impact on the spectral resolution of the spectrometer caused by counter rotating of the Sagnac prism,and even the fake spectrum would be brought in.In order to improve the spectral resolution of the spectrometer and remove the fake spectrum,the relationship between the counter rotating angle brought in when balsaming of the two semi-pentagonal prisms and the shearing displacement caused by which is deduced,the effect on spectral resolution caused by counter rotating error is analyzed,the correction method to the error using Forman convolution is discussed.The experiment was carried out using hydrogen lamp,the result shows that,the spectral resolution of the spectrum reconstructed after correction can be improved and the fake spectrum can be restrained dramatically,the correction result is good.

关 键 词：光学器件 成像光谱技术 校正 对旋 棱镜 

分 类 号：O433.4[机械工程—光学工程]