In this paper, a homogeneous off-axis reflective infrared imaging system with an aperture of Φ300mm is designed according to the requirements. The calculation and optimization of structural parameters are completed in the optical software Code V. The system obscuration is eliminated by combining aperture off-axis with off-axis field of view. By introducing complex surface type to correct the residual aberrations, the off-axis optical system with good capability and structure size meeting the overall layout requirements is obtained. The system is composed by main reflector (F-1), secondary mirror (F-2), plane mirror (M) and the third mirror (F-3). The mirror M is a folding reflector; even aspheric surface is used for both F-1, F-2 and F-3 mirror. The uncooled thermal imager is used as the imaging device. The target plane of the detector is 10.88mm × 8.70mm, and the corresponding field of view is 0.6 °× 0.45 °. At 15lp / mm, MTF > 0.2 is close to the diffraction limit of the system, and the wavefront aberration of the full field of view is less than 0.01λ. The distortion is less than 1.2%.
According to the requirement of system,an one-dimensional beam shaping system is designed for semiconductor laser. In this beam shaping system, we choose an aspheric cylindrical mirror as the shaping element. To design the aspheric cylindrical mirror, we first calculate the incipient structure and then use the software light tools to optimize and simulate. The result shows that for a semiconductor laser whose beam diverging angle is 40°, the diverging angle will smaller than 1mrad after shaping by the aspheric cylindrical mirror. Also, we test the actual beam shaping system and the result shows that it meets the requirement of system well.
As the development of electro-optical weapon system, the technique of common path and multi-sensor are used popular, and becoming a trend. According to the requirement of miniaturization and lightweight for electro-optical stabilized sighting system, a day light telescope/television viewing-aim system/ laser ranger has been designed in this thesis, which has common aperture. Thus integration scheme of multi-band and common aperture has been adopted. A day light telescope has been presented, which magnification is 8, field of view is 6°, and distance of exit pupil is more than 20mm. For 1/3" CCD, television viewing-aim system which has 156mm focal length, has been completed. In addition, laser ranging system has been designed, with 10km raging distance. This paper outlines its principle which used day light telescope as optical reference of correcting the optical axis. Besides, by means of shared objective, reserved image with inverting prism and coating beam-splitting film on the inclined plane of the cube prism, the system has been applied to electro-optical weapon system, with high-resolution of imaging and high-precision ranging.
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