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干涉式长波红外光谱成像技术以其独特的工作原理和谱段特性,在众多领域具有广泛的应用前景。为解决仪器小型化、轻量化问题,研究了一种基于变间隙法布里-珀罗(F-P)干涉仪的新型长波红外光谱成像系统。在分析系统工作原理的基础上,研究了确定F-P干涉腔两反射面的反射率、变间隙干涉腔的楔角等主要参数的理论依据;搭建了实验系统,得到了整个装置对黑体宽波段热辐射的响应;通过将系统测得的聚丙烯薄膜的透过率曲线与高精度光谱辐射计测量结果进行比较,结果显示系统光谱分辨率满足理论设计要求。研究表明:该系统能够有效满足长波红外光谱成像系统的轻便化、小型化的需求。
Interferometric long-wave infrared imaging technology with its unique working principle and spectral characteristics, in many fields has a wide range of applications. To solve the problem of miniaturization and weight reduction of instruments, a novel long-wave infrared imaging system based on a variable-gap Fabry-Perot (F-P) interferometer was studied. Based on the analysis of the working principle of the system, the theoretical basis for determining the reflectivity of the two reflecting surfaces of the FP interferometer cavity and the wedge angle of the interfering cavity with varying clearance was studied. The experimental system was set up, Radiation response; By comparing the measured transmittance curve of the polypropylene film and high-precision spectral radiometer measurement results, the results show that the system spectral resolution to meet the theoretical design requirements. The research shows that the system can effectively meet the needs of light-weight and miniaturization of long-wave infrared imaging system.