数字微镜哈达玛光谱仪谱线弯曲的分析与修正

发布时间：2018-03-17 04:04

本文选题：光谱仪　切入点：光谱修正　出处：《光谱学与光谱分析》2016年02期 　论文类型：期刊论文

【摘要】：由于数字微镜(digital micro-mirror device,DMD)哈达玛变换光谱仪其成本低,光能利用率高及无运动部件等优势,逐渐成为光谱仪领域的研究重点。研制了一款基于DMD的哈达玛变换光谱仪。为了解决光谱仪谱线弯曲造成的光谱分辨率下降的问题,对基于DMD的哈达玛变换光谱仪中的谱线弯曲所引起的谱带混叠进行了分析。首先,导出了谱带混叠与谱线弯曲的关系式。然后,提出了两个过程来解决谱带混叠,一是通过调整DMD编码条纹,使DMD所编码的谱带最大限度地与标准谱带重合;二是通过数据处理对谱带混叠进行修正。最后,通过对谱线曲率半径为5.8×10~4,7.8×10~4和9.7×10~4μm等六种情况下谱带混叠进行了分析与修正,拟合出光谱混叠和修正效果与谱线曲率半径的关系。结果表明:对于不同程度的谱线弯曲经过这两个过程修正后,分辨率都会改善到接近光学系统的分辨率,说明这两个过程对修正谱线弯曲具有普适性、并且方法简单、有效。
[Abstract]:Because of the advantages of digital micromirror digital micro-mirror device) Hadamard transform spectrometer with low cost, high utilization ratio of light energy and no moving parts, etc. A new type of Hadamard transform spectrometer based on DMD has been developed. In order to solve the problem of spectral resolution decline caused by spectral line bending of spectrometer, The spectral band aliasing caused by spectral line bending in Hadamard transform spectrometer based on DMD is analyzed. Firstly, the relationship between spectral band aliasing and spectral line bending is derived. Then, two processes are proposed to solve the spectral band aliasing. First, by adjusting the DMD coding stripes, the spectral bands encoded by DMD are overlapped with the standard bands to the maximum extent; secondly, the aliasing of spectral bands is corrected by data processing. Finally, The spectral band aliasing is analyzed and corrected under the six conditions of 5.8 脳 10 ~ (-1) ~ 47.8 脳 10 ~ (4) 渭 m and 9.7 脳 10 ~ (4) 渭 m. The relationship between spectral aliasing and correction effect and the curvature radius of spectral line is fitted. The results show that the resolution of different degrees of curve bending can be improved to the resolution close to that of optical system after the correction of these two processes. It is shown that these two processes are universal for correcting spectral line bending, and the method is simple and effective.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：国家自然科学基金重点项目(61137001) 国家重大科学仪器设备开发专项(2013YQ140517)资助
【分类号】：TH744.1

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