三线阵立体测绘相机热控系统的设计

为了保证测绘相机的正常工作和测绘精度,针对测绘相机的特点设计了热控系统,并对该系统进行了热平衡试验验证。首先,对测绘相机所处的热环境进行了分析,对测绘相机窗口的外热流进行了计算。然后,对测绘相机的各个部分进行了热设计;采用被动热控措施控制相机的温度水平,降低测绘相机系统对外部热环境变化的灵敏度;采取主动热控措施进行温差补偿,减小相机的轴向和对径温差。最后,根据测绘相机的热环境和各种工作模式设计了3种极端试验工况,进行了热平衡试验。试验结果表明,在热控系统工作的情况下,测绘相机系统在各种工况下温度波动在(18±2)℃之内,且轴向温差4℃,径向温差0.5℃,测绘基座的温度在(18±3)℃之内。得到的结果能够满足测绘相机系统的需求。

Design of thermal control system for three-linear array mapping cameras

In order to guarantee the normal work and mapping accuracy of mapping cameras, a thermal control system for the mapping cameras was designed and tested by the thermal balance tests. Firstly,the thermal environment of a mapping camera was analyzed,and the external thermal flux of the pupilin the mapping camera was calculated. Then, the thermal design of the mapping camera was carried out.A passive thermal control system was used to control the temperature of the camera to reduce the sensitivity of mapping camera to the external thermal environment. An active thermal control system was taken to carry out the temperature compensation to reduce the axial and radial temperatures of the mapping camera. Finally,three extreme test conditions were designed and thermal balance tests were undertaken according to various job models and different thermal environments. The test results show that when the thermal design system is working,the temperature fluctuations of the mapping camera are at (18±2) ℃,the axial and radial temperature differences are less than 4 ℃ and 0.5 ℃, respectively,and the temperature of the mapping base is (18±3) ℃. It is shown that all the temperature indicators in the mapping camera are able to meet the system requirements.