Design of Focusing and Collimation Optical System for Infrared Target Simulator

To meet the target simulation requirements of optoelectronic detection equipment such as guidance heads at a wider working temperature range and match the clear simulated target scene of the tested optoelectronic equipment at different working distances, a focusing target simulator collimation projection design scheme based on secondary imaging and non-thermal design was proposed. By conducting a detailed analysis and matching the optical material parameters, three types of infrared optical materials were used to form a group of five lenses, and a field lens was added to compress the beam aperture. A focusing lens group and precision mechanical structure were set up in the relay lens group. We achieved the design of an infrared target simulator with a working range of 8-12 μm, exit pupil distance of 850 mm, exit pupil aperture of 115 mm, and a circular field of view of 8° at a working temperature of 0-40℃. Furthermore, the tested optoelectronic device was adapted to work at a working distance of 170 m in front of the exit pupil to infinity and 170 m behind the exit pupil to infinity. The Modulation Transfer Function of each field of view of the system was better than 0.33 design value at 36.5 pl/mm, and the distortion was less than 0.35%. The actual test results of the target simulator after processing and adjustment showed that all the indicators met the design requirements, and the transmittance reached 75.59%.