The Optical Design Of Laser And Mid-wavelength Infrared

Composite guidance is composed of a variety of guidence mode.It works at different stages in the guidance and can complete missile homing tasks, due to its comprehensive advantages of performance, currently all the nation focus military technology and military power to develop it. With the progress of science and technology, the development of various countermeasure technology, single mode detect system are still inadequate, it can not meet the operation requirements, highlights the growing importance of multi-mode compound guidance. In order to realize the precision guidance of missile, through the analysis and comparison of existing various compound guidance plan, this paper proposes an imaging infrared/laser radar dual-mode hybrid optical system design. Mainly uses the method of passive infrared imaging and laser radar guidance combined configuration,it works firstly use the passive infrared search field and confirm the target, then the laser radar system acquired the target information and precise tracking. The whole optical system using the identical receiving aperture, thus structure is compact, meeting the requirements of miniaturization of seeker and the accurate identification and tracking of the target requirements。Cording to the requirement,the infrared wavelength of laser and infrared composite guidance optical system is3μm-5μm, while laser wavelength is1.064μm,receiving diameter of the system is250mm,infrared field is2°the value of MTF is greater than0.4at331p/mm, infrared focal plane array is of640×512pixels,each pixel is15μm×15μm the design has finally choosen twice imaging with refractive and reflective structure to deal with the athermalization and compact problem.