Optical System Design Of Multi Mode Common Optical Path Navigation Sensor

In recent years,with the continuous improvement of deep space detection demand,the performance requirements of optical navigation sensitizer have become higher and higher,and multi-mode navigation sensitizer has become the development trend of optical navigation sensitizer.It is difficult to meet the demand of multi-band space detection in conventional single-band optical navigation sensors.Although the simple multi-camera splicing method can solve the problem,it is difficult to apply because the load volume,weight and cost will be greatly increased.Co-caliber optical system has become the first choice for multi-band navigation sensor optical system because of its advantages of wide band,simple and compact structure,light weight and so on.However,the selection of wide-band optical materials is limited,and the selection of optical components and optical structure layout is a difficult point in multi-band co-caliber optical design.Therefore,this paper carries on the simulation design to the multi-band common optical path optical navigation sensitizer optical system,mainly includes the following contents:First,analyzes the multi-band optical navigation sensitizer basic principle,the different structure design advantages and disadvantages,according to this topic light miniaturization design request,carries on the theory analysis and the design to the system structure,,the wide band,the small volume,the light weight reflective optical system.The system is based on the common reflective optical system,the prism is set between the sub-mirror and the image surface,and the sub-mirror is coated to make the visible light band,the long wave infrared band and the laser image independently imaged in the detector,which realizes the requirement of multi-band.Secondly,according to the actual design requirements,the initial structure is reasonably established,and a genetic algorithm is proposed to solve the initial structure calculation method of two mirror system according to the three-stage aberration theory.The optical system is optimized by optical design software.Finally,the visible light imaging system and the long wave infrared imaging system have good image quality,the laser receiving system has concentrated energy,and the wholeoptical system has compact structure.Finally,the practical engineering application of the system is considered.the working environment of the system is analyzed.by comparing different heat-free design methods,the optical passive heat dissipation difference method is finally selected.the design results show that the long wave infrared imaging system of the visible light imaging system has good imaging quality at-20?~60?,the transfer function drop is not more than 0.1,and the final image quality of the imaging system is not affected by temperature.the optical imaging system can be clearly imaged in the working temperature range.the laser receiving system at-20?~60? has a high energy aggregation and meets the requirements of use.In order to meet the actual processing problems,the tolerance of optical system is allocated,and the tolerance analysis shows that the tolerance distribution is reasonable to meet the actual engineering requirements under the given tolerance conditions.