## 1 Introduction  
Traditional infrared imaging technology only obtains information on the infrared radiation intensity of targets. However, the polarization characteristics of infrared radiation are one of the important characteristics of the interaction between electromagnetic radiation and matter and can show different infrared polarization characteristics for different targets' reflected radiation or their radiation, which can improve the image contrast and determine the working state and material of the target. In 2006, Polarissensor, Inc. experimented with evaluating the effectiveness of maritime search and rescue using IR polarization imaging. The results showed that compared with IR intensity imaging, IR polarization imaging could significantly improve the contrast between people, floating objects, and the sea surface background [1]. In 2011, AFRL conducted long-wave IR polarization imaging experiments on small, remotely piloted model aircraft in different backgrounds. The results showed that long-wave IR polarization imaging in cluttered backgrounds could improve the signal-to-noise ratio, enhance detection performance, and reduce the false alarm rate [2]. In 2007, [PERSON] et al. of Anhui Institute of Optical Precision Machinery, Chinese Academy of Sciences, conducted polarization imaging experiments on metal target plates in the ground using a thermal infrared polarization imager [3]. In 2010, [PERSON] and others from the Beijing University of Technology built a medium-wave infrared polarization imaging experimental platform and conducted polarization imaging, image fusion, and reconstruction experiments on typical scenes and targets [4]. In 2016, [PERSON] and others from the Beijing University of Technology carried out polarization imaging research on typical targets such as aircraft in the sky, ships in the sea, and vehicles on the grassland using the independently developed long-wave infrared polarization imaging system [5]. In 2018, [PERSON] of Changchun Institute of optics, precision machinery, and physics, Chinese Academy of Sciences, designed a sub-aperture infrared polarization optical system with a focal length of 200 mm [6]. In 2021, the polarization performance simulation model of the medium-wave infrared integrated polarization HgCdTe detector was established, and the influence of different grating parameters on the polarization performance of the detector was simulated and analyzed [7].  
However, the imaging devices employed in the above studies have disadvantages such as large size, complex structure, difficult alignment, and inability to identify moving targets. This paper proposes a micropolarizer-based infrared polarization imaging method for typical targets. We also designed a long-wave infrared polarization optical system to meet the imaging requirements, realized the all-time detection and imaging of typical natural backgrounds and targets, and designed a micropolarizer array suitable for the long-wave infrared band. Through the target infrared polarization imaging experiment, the unique advantages of infrared polarization technology in distinguishing metal from non-metal, natural objects from artificial objects, and high-temperature objects are verified.