摘要
大基高比测绘相机斜视利于进行地面高程测量,小基高比测绘相机近正视利于进行平面高精度定位,并有利于降低畸变和减小遮挡。双基高比测绘是结合了大小基高比测绘优点的新型测绘手段,但需要对大功率设备进行高效散热,同时需为大尺寸镜面提供高精度温度梯度,这对双基高比立体测绘相机热控系统设计提出较高要求。文中采用耦合散热面、在大尺寸镜面背部设计铝合金热罩减小温度梯度、布置多路控温回路、利用高性能热管增强导热相结合的方式,对双基高比相机的热控系统进行详细设计。通过对相机外热流的分析,确定了β=17°,焦面组件、电子学器件、控制器同时工作的高温工况;β=27°,相机待机的低温工况。结合相机内热源及接口信息,制定了详细的热控方案,通过仿真分析验证了热控方案的正确性,各温控指标达到设计要求。文中可为我国双基高比立体测绘相机的研制提供热控方面技术支持。
Strabismus of wide baseline mapping camera is benefit for ground elevation measurements. Front view of small baseline mapping camera is benefit for location with high precision, reducing distortion and decreasing shelter. Double baseline is a novel mapping means, combining the advantages of wide baseline mapping and small baseline mapping. But it requires efficient cooling for high power equipment and high precision temperature gradient for large-scale mirror, which put forwards harsh requirements for thermal control system. In this paper, some measurements were adopted to design thermal control system for double baseline mapping camera, such as coupling the radiating surfaces, designing aluminum heat shield in the back of large-scale mirrors, disposing many thermal control loops, and using high-performance heat pipe enhanced thermal conductivity. Based on the analysis about camera′s external heat flux, two extreme working conditions were determined. Hot working condition isβ=17° ,and focal plane assembly, electronics devices and controllers were all working. Cold working condition is β=27° , and the camera was in standby model. Considering with the interior heat fluxs and interface conditions, detailed thermal control schemes were established, and simulation results revealed the correctness of the thermal control schemes, and the temperature of various components met the design requirements. Our work can offer some thermal technique supports to study about mapping camera with double baseline.
出处
《红外与激光工程》
EI
CSCD
北大核心
2013年第12期3270-3276,共7页
Infrared and Laser Engineering
关键词
热设计
大基高比
小基高比
双基高比
测绘相机
Cameras
Cold working
Design
Heat flux
Hot working
Mapping
Mirrors
Temperature control
