The Design Optimization Of The Indium Sealing System And The Research Of Sealing Stress About The He-Ne Laser Gyro

One of the key technologies to maintain the vacuum environment of the micro crystal resonator is the indium sealing technology.This paper investigates the structure characteristics of He Ne laser gyro in terms of indium sealing technology,and the influence of residual stress and temperature on the fatigue failure is examined.The main contents are as follows:This paper analyzes the relationship of the residual stress with respect to deflection on the sealing interface on account of the elastic-plastic mechanics theory.Based on higher heat transfer theory,the heat transfer method during the sealing process is obtained,as well as the variation rule of the temperature.The physical and mathematical model of the structure of the laser gyro cavity electrode-indium sealing is established.The stress of indium sealing structure is investigated by theoretical analyses and numerical calculations based on the boundary conditions.Then,the variation of residual stress of axial,circumferential and axial is gained.The effects of indium wire diameter and indium alloy stoichiometric on the residual stress are examined.The parameters of the sealing process are optimized.Meanwhile,the indium sealing performance and sealing strength of the resonant cavity vacuum are improved,which provides technical parameters and theoretical basis for the continuing design of laser gyroscope electrode hot indium sealing system.This paper studies on the fatigue by choosing the Anand viscoplastic model based on the basis of viscoplastic fluid equation and damage evolution theory.According to the geometric symmetry and symmetry load,indium sealing structure is simplified.A twodimensional finite element model is constructed.Meanwhile,the boundary conditions and viscoplastic parameters are given.On the basis of the finite element model,the indium sealing structure fatigue failure problems and the failure trend are studied at the circulating temperature.According to the plastic strain accumulation effect,the dangerous node is determined,and the corresponding causes of force hysteresis loop and the temperature of the ratchet wheel are analyzed.To improve the processing efficiency,the indium sealing system is obtained.It is based on process parameters,the model size of indium sealing characteristics and the difficulties during sealing.The following aspects are researched: the optimal distribution of pining points are obtained based on the packaging fixture,which realized the clamping of chamber during sealing,and the clamping reliability was analyzed;the embedded body structure was designed,the angular body reliability was verified from the comparison of body performance under open,closed,semi open working condition,and the semi open lightweight fuselage was chosen;the vacuum clamping system,starting from hot pressing mechanism,was designed,which is based on the surface features from the measured thermal stress,after the comparison of the different principle of the platform,anode pressure and heat transfer characteristics.In this research,the pressure sensor system with temperature compensation unit is designed,the temperature sensor control system is constructed,the position of the displacement sensor is pinned,and the machine vision is used to establish the collimation detection system.Based on the above design,the overall structure of the electrode sealing system of He Ne laser gyro is set up.