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为了抑制杂散光对中红外平面光栅光谱仪系统成像质量的影响,首先探讨了系统杂散光的来源,设计了遮光罩、挡光环和里奥光阑;然后针对用挡光板消除光栅衍射杂散光能力有限的问题,提出利用百叶挡光板和杂散光收集器组合来抑制杂散光的影响,并结合三维建模软件Solidworks和杂散光分析软件Tracrpro对系统进行了建模、分析和对比;最后针对某一型号红外热电堆阵列探测器并运用黑体辐射理论对其进行计算和分析,最终结果表明:光谱仪系统地气杂光抑制水平PST可以达到10-11,内部杂散辐射抑制能力有效发射率为1.3%,满足中红外平面光栅光谱仪系统杂散辐射的抑制要求。
In order to suppress the influence of stray light on the imaging quality of the mid-infrared grating spectrometer system, the source of system stray light was firstly discussed, and the light shield, the light blocking ring and the LEO aperture were designed. Then the limited ability to eliminate the grating diffraction stray light with the light barrier The paper proposes the use of the combination of louver baffle and stray light collector to suppress the influence of stray light. The system is modeled, analyzed and compared with Solidworks and stray light analysis software Tracrpro. Finally, aiming at a certain model Infrared thermopile array detector and the application of blackbody radiation theory to calculate and analyze the final results show that: the spectrometer system of gas stray light suppression level PST can reach 10-11, the internal spurious radiation suppression ability of the effective emissivity of 1.3% Meet the suppression requirements of spurious radiation in the mid-infrared plane grating spectrometer system.