Research On The Effects Of Space Temperature Field On Performance Of Different Structures Plane Mirror

45-degree reflector of periscopic laser communication terminal in satellite lasercommunication system is fixed outside the satellite,space alternating hot and coldenvironment will make the deformation of the reflector,then the beams emitted andreceived by the45-degree reflector will have wavefront distortion,and will causepointing and tracking error.Therefore,it is necessary to study the method of reducingthe thermal deformation of45-degree reflector on orbit.In this dissertation,we present a new45-degree reflector structure—edge-hingedstructure—to reduce the thermal deformation of the45-degree reflector on orbit,toimprove the temperature adaptability,to reduce the aim design of thermal control,andto improve pointing and tracking accuracy.The specific works are introduced asfollowing.In this dissertation,we found the45-degree reflector model of different hingestructures and different hinge parameters.The variation of thermal deformation withuniform temperature difference on single-hinged,non-hinged,double-hinged andsingle-hinged whose hinge parameters are232,223,225are given.The simulationresults show that the single-hinged reflector whose hinge parameter is225has theminimum thermal deformation.The thermal deformation of single-hinged,non-hinged,double-hinged andsingle-hinged reflectors whose hinge parameters are232,225are studied when there istemperature gradient on the45-degree reflector.The simulation results show that thesingle-hinged reflector whose hinge parameter is225has the minimum thermaldeformation.When there are both uniform temperature difference and temperaturegradient on the45-degree reflector,the thermal deformations are compared ofsingle-hinged reflector whose hinge parameter is225and non-hinged reflector.Theresults show that the single-hinged reflector whose hinge parameter is225hasrelatively smaller thermal deformation.The variation regularity of temperature field and thermal deformation onsingle-hinged reflector whose hinge parameter is225and non-hinged reflector onorbit are given.The simulation results show that the single-hinged reflector whoseparameter is225has a smaller temperature range and thermal deformation comparedwith the non-hinged reflector. Finally,the variation regularity of pointing error,far-field intensitydistribution,attenuation of the far-field peak intensity,tracking error,detector focalplane intensity distribution and attenuation of the peak intensity on the detector focalplane with uniform temperature difference and temperature gradient on the45-degreereflector are studied.The results show that,compared with the non-hinged reflector,thesingle-hinged reflector whose hinge parameter is225has smaller pointing andtracking error,the pointing and tracking accuracy has been improved greatly.In summary,using the single-hinged reflector whose hinge parameter is225asthe45-degree reflector structure of periscopic laser communication terminals,cansignificantly reduce the thermal deformation of the45-degree reflector onorbit,improve the temperature adaptability,improve system pointing and trackingaccuracy and reduce the aim design of thermal control and system powerconsumption.The study of this dissertation has important guiding significance for the selectionof the structures of45-degree reflector on periscopic laser communication terminals,italso provides important reference support for the design of the system temperaturecontrol.