Structural Design And Analysis Of Radiation Performance Tester For Low-Light Image Intensifier

Low-light-level image intensifier is the core device of modern low-light-level night vision equipment,which has a decisive influence on the overall performance and application effect of the equipment.Equivalent background illuminance and Signal-tonoise ratio are important parameters for evaluating the comprehensive performance of low-light image intensifiers.In order to realize the detection of radiation performance parameters of image intensifiers based on cooled Si photodiode detectors,this paper is based on the national military test standard,the structural design of the low-light image intensifier radiation performance tester and the simulation analysis of its mechanical characteristics are carried out,and the environmental adaptability test of the assembled tester is carried out.The tester adopts the scheme of cascaded integrating spheres to improve the uniformity and stability of the output of the radiation light source.Combined with the iris diaphragm and the micro-aperture diaphragm tube,it provides the uniform and weak illumination light source required for the test;the test darkroom is designed to solve the problem of the image intensifier.Center the registration problem and reduce the stray light of the system;combine the heat and electromagnetic compatibility design requirements to complete the structural design of the detector module;adopt a sealed box structure to provide a dark room environment for image tube testing,and built-in blackened support partitions,Improve the mechanical resistance of the whole machine.Use ANSYS to carry out dynamic analysis,and impose specified constraints and loads on the whole machine of the tester.The results show that the fundamental frequency of the whole machine is 564.94 Hz,the maximum equivalent stress is 11.6MPa,and maximum offset is 0.36 mm,the strength and stiffness meet the design requirements.After the complete assembly of the tester,mechanical tests such as random vibration,functional impact,and inclined drop were carried out,as well as environmental adaptability tests such as temperature,humidity,low air pressure,and electromagnetic compatibility.The deviation between the signal-to-noise ratio test results before and after the test and the nominal value was less than2.5%;the equivalent background illuminance test result is consistent with the nominal value,and all the functions of the instrument are normal,which proves the rationality of the system structure design and provides a solid foundation for the low-light image intensifier radiation performance tester to work reliably in complex working environments.Figure [83] Table [20] Parameter [55]...