Study On The Optical System Of Eyesafe Imaging Infrared/laser Seeker

In the informatization condition of war, precision-guided weapons as an important means of implementing destructive blow, accuracy of accurate-attacking weapons depends on the guidance seeker technology, at present, laser/IR double guidance is considered the most development foreground of technology, it can achieve the photoelectric complementary, overcoming the shortage of each, and utilization the advantages of both. With the advantages of high precision and accuracy of electronic jamming, it become hot spot in international.Based on eye safety, a novel optical design of IR/Ladar seeker is presented. It integrates the infrared imaging sensor and Ladar imaging sensor into a compact seeker by means of the common aperture. In the seeker, the IR sensor detects the scene, discriminates the reentry vehicle and indicates the selected target for Ladar. Then, the target will be imaged on the focal plane sensor of Ladar, and be sampled in snapshot mode. So, the seeker will get precisely 3D-information (angle-angle-distance) between missile and target.First of all, The paper puts forward the design requirements, and according to the design scheme of infrared imaging formulas and laser radar staring function, based on the distance equation, determine the detector, laser and performance parameters of optical system.In the infrared optical system design, According to the characteristic and design principle of infrared imaging system, choice the right optical components, discusses the system structure. Basis on it, the infrared imaging system is designed, and evaluates performance of the IR system. Then the paper finishes environment analysis at the temperature range -40~60 degree Centigrade, and accomplish athermal design of IR imaging system, the system can fill with the requirement and has good imaging quality.In optical fiber laser radar optical system design, according to the principle of laser radar, high Power, short pulse amplification of the oscillation fiber (Master - Oscillator Amplifier) fiber laser and 64×64 InGaAs APD array is choose. Then laser receiving/emitting optical system is designed, and evaluates performance of the system. In order to prevent failure detection, a scheme of diffractive micro-lens and fiber coupling with detector array is puts forward, and deduce the diffractive micro-lens array parameters, calculate light energy utilization ratio, the system meets the design target.