Design Of Dual-band Adaptive Optical System

Due to the influence of atmospheric turbulence,the imaging resolution of the telescope is reduced for long-range observation.An adaptive optical system is introduced to improve the ability of detecting and identifying.Dual-band adaptive imaging system is one more observation channel than a single band to find targets rapidly.Visible light can be combined with infrared to obtain more accurate and more comprehensive goal information.The optical system meet the requirements to observe target both the resolution of the scene details and in the fog,rain,snow weather.Therefore,it is of great practical significance to study the dual-band adaptive optics system.In order to improve the imaging performance of dual-band optical systems,considering the characteristics of visible light and MWIR,achromatic and focal length,compensation expression between wave band are derived and the dual-band co-calibe/co-path and parfocal without compensation adaptive optical pathoptical system is designed.The types of telescope systems are analyzed and compared and the dual-band telescope is designed.The material properties of the reflector mirror of the wavefront corrector are described.The basic principle of wavefront sensors is introduced.The material of the deformable mirror is reasonably chosen.The Hartmann-Shack wavefront sensor array lens is designed.Finally,the dual-band adaptive optics system is matched with the dual-band telescope system.The optical system operating wavelength is 0.38 ?m-0.76 ?m and 3 ?m-5 ?m,the focal length of the whole optical system is 1000mm,the filed of view is 0.5:and the F number is 15,respectively.The system can simultaneously receive the target information of the visible light and the medium wave infrared,thereby improving the consistency and accuracy of the detection target information.At the Nyquist Frequency of 611p/mm,the modulation transfer function(MTF)of visible optical system is higher than than 0.4 at the edges of the field of view,and the MTF of MWIR system reaches 0.4 at 201p/mm.The spots of all field imaging are concentrated in a single detector range.The imaging system uses a combination of positive and negative lens and binary diffractive surface to realize the dual-band fusion of visible light and medium wave infrared imaging,and to achieve the purpose of all-weather detection.According to requirements,the optical system uses binary optical element to achieve athermal design of optical passive mode.The image plane is stable and the image quality is excellent when the system works on-40 ??+ 60 ?,which meets the using requirement of system.Finally,sensitivity analyzing method is used to analyze the tolerance of the system.The results show that the designed system structure is simple and can meet the image quality requirements.