变间隙法布里-珀罗干涉式长波红外光谱成像系统

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。

LWIR imaging spectrometer employing a variable gap Fabry-Perot interferometer

With unique working principle and spectral characteristic, the long wave infrared (LWIR) interferometric spectral imaging is a popular technology with wide application in many fields. In order to miniaturize and light the instrument, a new method of LWIR spectral imaging system based on a variable gap Fabry-Perot (F-P) interferometer was researched. With the system working principle analyzed, theoretically, it was researched that how to make certain the primary parameters, such as, the reflectivity of the two interferometric cavity surface and the wedge angle of interferometric cavity. A prototype was developed and good experimental results of blackbody and polypropylene film were obtained. The research shows that besides high throughput and high spectral resolution, the advantage of miniaturization is also simultaneously achieved in this method.