Analysis Of Impact Load On Performance Of Infrared Optical Lens

With the wide application of photoelectric technology in various fields,the application environment of infrared optical lens is more complex and diverse,and the performance requirements of infrared optical lens are increasing.Infrared optical lens is often affected by impact,collision,drop,vibration and other factors,so as to reduce its performance.Taking an infrared optical lens as an example,the impact load on the performance of the infrared optical lens is studied.Firstly,the 3D model of the infrared optical lens is established,and then the mode analysis of the infrared optical lens is carried out to obtain the first 6 order natural frequencies and mode shapes.The impact simulation analysis of infrared optical lens was carried out based on ANSYS software,and the deformation and stress distribution of infrared optical lens were obtained under the impact load in different directions.By analyzing the deformation of the primary mirror barrel,the optical declination Angle of the infrared optical lens is estimated,and the influence of impact load on its optical axis consistency is studied.Then,the deformation and stress of the lens under impact load are analyzed,the deformation data of the lens mirror is extracted,and the surface shape fitting of the lens mirror under impact load is carried out by using Zernike polynomial,and the rigid body displacement,PV value(peak and valley value),RMS value(root mean square value)and Zernike coefficient of the lens are calculated.The Zernike coefficient and lens data were imported into the optical design software,and the performance of the infrared optical lens was evaluated and analyzed by using the evaluation index of optical performance,so as to analyze the impact of different directions on the performance of the infrared optical lens.It provides theoretical basis and reference for studying the impact resistance of infrared optical lens.In order to reduce the impact load on the performance of the infrared optical lens,the optimization module of ANSYS software was used to optimize the structure of the infrared optical lens by using the response surface method,with the size of the main barrel,outer frame and frame as variables.The results show that under the impact load,the lens deformation and stress of the optimized infrared optical lens are reduced,and the optical axis deflection and mirror distortion of the lens are also improved,achieving the expected optimization purpose.It provides a reference for the design of impactresistant structure of infrared optical lens and the improvement of its service life and performance.Finally,the experimental verification analysis of infrared optical lens under impact load is carried out.The reliability and validity of the simulation results are verified by impact test,optical axis consistency test and MTF test.