Design And Simulation Analysis Of Solar Simulator With High Collimation And High Irradiance

The sun has a very important position in many fields of science,such as aerospace,weather,solar energy and other fields,solar simulation technology has important scientific significance.As an important device to simulate the characteristics of solar radiation,solar simulator can simulate the light source close to the sun in optical characteristics on the ground,such as irradiance,uniformity,spectral distribution,collimation,stability.For the need of stray light test of space optical system,ground tests on solar sensors,a high collimation(collimation angle 32?),high irradiance(higher than 1353W/m2)solar simulator need to be developed,and the existing solar simulator do not meet the performance requirements very well.In this paper,high collimation,high irradiance solar simulator are analyzed,the main research work includes the following parts:First,the types of common solar simulator and the advantages and disadvantages are discussed,the structure type is determined,and system composition and working principle are discussed.Technology indicators of solar simulator are discussed,including spectral characteristics,irradiance,uniformity of irradiance,stability of irradiance and so on.According to the technical indicators,the coaxial transmission collimation structure is selected,and it consists of light source system,concentrator system,uniform light system,field diaphragm,collimation system and so on,and the working principle and imaging relationship of this structure type are discussed.Second,according to the indicators,the key technologies and difficulties are analyzed,the evaluation of optical system design is determined,and the optical system is designed.The analysis of the working principle of the system shows that the reason that high collimation and high irradiance can't be satisfied at the same time is the reduction of energy utilization rate.Therefore,this paper aims to improve the energy utilization rate as an evaluation index of optical system design,use pupil matching as a design criterion.According to the power estimation and other aspects of the requirements of the light source,short arc xenon lamp is the best choice.The various aspects of the xenon lamp is analyzed to guide the design of subsequent optical system.Combined concentrator is proposed,to break the traditional structure's restrictions,enhance the overall system's energy efficiency.Select the optical integrator as uniform light parts,propose a new imaging relationship.According to the energy utilization the system parameters is determined.The parameters of the field diaphragm and collimator are determined,the design is optimized from the perspective of improving the alignment accuracy.Finally,the system model is established,and the influence of the key parameters on the performance is analyzed by simulation software,and the overall performance of the system is simulated.A new xenon lamp modeling method is proposed to better simulate the spatial distribution and angular distribution of xenon lamp irradiation.The optical model of the solar simulator is established,and the model was simulated and analyzed to determine the influence of the key parameters such as optical tunnel structure,xenon lamp defocus,projection mirror defocus,optical integrator diameter,imaging relationship and so on.The results show that the system meets all the indicators and the energy utilization rate is greatly improved,the technical difficulties of high precision,high radiation solar simulation technology are solved.