为了实现球面栅网零件几何要素的精密测量,快速筛选出满足电子光学设计要求的合格零件.对测量设备与附件的特点、零件的设计要求、加工工艺带来的常见超差问题进行研究.根据零件的测量要素,从测量效率和精度的角度考虑,选择了加装激光辅助对焦系统的影像测量仪.编写了自动测量程序,自动将粗定位定向转为精准定位定向,完成了零件全部几何要素的自动测量.针对“大半径、小圆弧”的测量难点,进行了量化分析和计算,得出了曲率半径测量结果不确定度的计算公式.最后,讨论了测量不确定度的来源,提出了抑制各误差源的方法.实际应用时,利用上述影像仪完成了栅网零件的曲率半径SR、栅网球面的面轮廓度、环向栅丝同心度、径向栅丝圆分度α、全部栅丝宽度WR和WC、端面外径及其圆度、端面平面度的自动精密测量.测量时间约为传统方式的2/3,测点数量达2 094个,远高于手动测量方式.

As the core component of space traveling wave tubes, the cathode-heater assembly is required to be stable, reliable, long life and low power consumption. In this paper, an estimation method of thermal contact resistance is proposed, and the thermal characteristics of cathode-heater assembly structure are simulated. Meanwhile, thermal experiment is designed and undertaken, and the whole temperature distribution of cathode-heater assembly structure under a variety of heating power is obtained for the first time. Furthermore, the thermal boundary and excitation of cathode-heater assembly structure is modified, and the values of thermal contact resistances are obtained by interactive method. Finally, a high reliable thermal model of cathode-heater assembly structure is obtained. It is revealed that cathode temperature calculating accuracy is within 5%, and the calculating error of whole structure is less than 72°C .

The design of the slots on cathode supporting cylinder of the cathode-heater assembly,used as the e-lectron beam source of space-borne traveling wave tubes (TWTs).First,the heat flow field in the cathode-heater as-sembly was modeled,measured with the lab-built test platform,and simulated in finite element method with ANSYS software.The measured and simulated results show that the accuracy of the calculated cathode temperature is better than 5%,and the calculation discrepancy of the whole cathode-heater assembly is within 72℃.Next,the impact of the slots,including its number,size,position,and orientation,on the heat flow and cathode temperature was investi-gated by thermal simulation.Finally,the current slot design was optimized and the novel heater-cathode assembly with the optimized slots was simulated.The simulated results show that the heating efficiency of the new heater-cath-ode assembly,with reliable mechanical properties,increased by 1 5.2%.

X波段空间行波管是卫星数传分系统的关键部件,本文根据卫星数传要求,给出了X波段70 W空间行波管的设计与样管研制情况,研制样管的测试结果满足指标要求,并通过了鉴定级环境试验.

AM/PM conversion coefficients were measured by traditional method and the method based on vector network analyzer,respectively.The different measurement methods were compared.The results indicated that the method based on vector network analyzer is feasible and efficacious by adjusted the settings of vector network analyzer.

High efficiency and high linearity space traveling wave tube (TWT) is required for satellite communication system as a high power, high gain microwave amplifier. The design of a high efficiency X-band 40W space TWT is introduced in this paper and the development for this TWT was succeed.