Optics system design of the middle-wave infrared camera for spatial non-cooperative targets

Based on the spatial non-cooperative target detectors, a design of hybrid diffractive/refractive dual-field-of-view middle-wave infrared optical system is put forward. Compared with the continuous zoom optical system, infrared dual-field-of-view optical system has many advantages, such as simple structure, easy fixing, quick switching and so on. A compact and lightweight infrared dual-field-of-view hybrid diffractive/refractive optical system is designed. The zoom system has intermediate image plane and the zoom group is moved through the optical axis to implement dual-field-of-view. The system consists of only seven lenses, and can realize 160 mm/40 mm dual-field-of-view at the spectrum region of 3.7~4.8 μm, which can obtain the cold shield efficiency of 100%. The design result shows that the system has the advantages of compact structure, high image quality and low price.