空间遥感器线阵与面阵探测器共基板焦面组件设计

Design of focal plane assembly of linear array and area array detector based on one substrate of space remote sensor

空间遥感器的焦面组件是空间遥感器的一个关键部组件,完成光信号到电信号的转变功能,要求其具有高拼接精度、高稳定性和高度轻量化的性能。针对某深空探测遥感器兼具推扫成像和凝视成像的功能需求,设计了一种线阵面阵探测器共基板的焦面组件,主要包括焦面基板、CCD组件、CMOS组件和视频处理电路板等。通过合理的布局,在一块焦面基板上完成了三片CCD芯片和两片CMOS芯片的布局设计,结构紧凑,散热效果好,同时利用铜片分割和电箱结构覆盖的手段提升了焦面组件的电测兼容性能。完成焦面组件的拼接,CCD探测器的搭接误差优于±2μm,各个探测器的共线和平行度误差优于±2μm,共面度误差优于±2.5μm。最终,对焦面组件开展了力、热环境试验,探测器的共线、平行度和共面度误差均无变化,表明焦面组件具有足够高的拼接精度和稳定性,焦面组件的基频为135 Hz,具有足够高的动态刚度,同时,还对整机进行了电磁兼容试验,性能良好。

Focal plane assembly of space remote sensor is a key component of space remote sensor,which is used to finish the transition function of the light signal into electrical signal.The focal plane assembly should have the characteristics of high splicing accuracy,high stability and high lightweight performance.In view of the function requirement of a deep space remote sensor with push-scan imaging and staring imaging,a focal plane assembly whose substrate was common with CCD detector and CMOS detector was designed,the focal plane assembly included focal plane substrate,CCD component,CMOS component,video processing circuit board,and so on.With a reasonable layout,the focal plane assembly was designed with three pieces of CCD and two pieces of CMOS,which was a compact structure and had a good heat dissipation effect.Moreover,the electromagnetic compatibility performance of focal plane assembly was improved obviously with the means of copper segment and box structure covering.After the assembling of focal plane assembly,the lapping error of CCD detector was better than±2μm,the collinearity and parallelism error of detector of CCD and CMOS was better than±2μm,the coplanarity error was better than±2.5μm.Finally,the force and thermal tests were carried out for the focal plane assembly,and the collinearity,parallelism and coplanarity errors of the detector did not change,indicating that the focal plane component has high enough splicage accuracy and stability.The fundamental frequency of the focal plane assembly is 135 Hz,which had sufficient dynamic stiffness.At the same time,the electromagnetic compatibility test was carried out on the space remote sensor,with good performance.