为获取高信噪比的气溶胶遥感数据,针对光谱仪成像系统链路分析了影响云与气溶胶探测仪信噪比的关键因素。结合光谱仪成像电路系统的响应模型,确定了电子学系统信噪比的表达式,针对可见探测器和红外探测器。提出了模块化的高信噪比成像...为获取高信噪比的气溶胶遥感数据,针对光谱仪成像系统链路分析了影响云与气溶胶探测仪信噪比的关键因素。结合光谱仪成像电路系统的响应模型,确定了电子学系统信噪比的表达式,针对可见探测器和红外探测器。提出了模块化的高信噪比成像光谱仪电路系统的设计方法,并描述了云与气溶胶探测仪成像电路系统从总体设计到模块设计的完整研制方案。对云与气溶胶探测仪进行辐射定标试验,试验结果表明:可见单机各通道在典型辐亮度条件下最小信噪比为50.9 dB,红外单机各通道在典型辐亮度条件下最小信噪比为62.3 d B,满足指标要求。针对可见探测器和红外探测器的成像电路系统设计方法对其他光谱仪电路系统设计具有借鉴意义。展开更多
A composite structure with frame and skin based on cabin structure in a large space telescope is studied in this paper.The frame is composed of longitudinal and transverse beams with hybrid bonded/bolted joints,and th...A composite structure with frame and skin based on cabin structure in a large space telescope is studied in this paper.The frame is composed of longitudinal and transverse beams with hybrid bonded/bolted joints,and the skin is connected to the frame by bolts.Tensile tests are conducted on the structure by a set of test stand.It is observed that residual deformation occurs in the first test of the structure,which is attributed to the relative sliding between the skin and frame because of bolt-hole clearances.The high tightening torque and the increased number of the skin-frame bolts contribute to the high stiffness of the structure.A finite element model(FEM)of this composite structure is established,and the simulation model is verified by the experimental results.The FEM is contrastively analyzed with different frame joints,and it is found that adhesive joining in the hybrid bonded/bolted joints enhances the stiffness of the structure significantly.Given that adhesive plays a leading role in the stiffness of the hybrid joints,Tie contact in FEM is proposed to simulate bonded or hybrid joints when studying the stiffness performance of undamaged structure.展开更多
文摘为获取高信噪比的气溶胶遥感数据,针对光谱仪成像系统链路分析了影响云与气溶胶探测仪信噪比的关键因素。结合光谱仪成像电路系统的响应模型,确定了电子学系统信噪比的表达式,针对可见探测器和红外探测器。提出了模块化的高信噪比成像光谱仪电路系统的设计方法,并描述了云与气溶胶探测仪成像电路系统从总体设计到模块设计的完整研制方案。对云与气溶胶探测仪进行辐射定标试验,试验结果表明:可见单机各通道在典型辐亮度条件下最小信噪比为50.9 dB,红外单机各通道在典型辐亮度条件下最小信噪比为62.3 d B,满足指标要求。针对可见探测器和红外探测器的成像电路系统设计方法对其他光谱仪电路系统设计具有借鉴意义。
基金Supported by the National Natural Science Foundation of China(No.51805510)Science and Technology Development Plan Project of Jilin Province(No.20200201294JC)。
文摘A composite structure with frame and skin based on cabin structure in a large space telescope is studied in this paper.The frame is composed of longitudinal and transverse beams with hybrid bonded/bolted joints,and the skin is connected to the frame by bolts.Tensile tests are conducted on the structure by a set of test stand.It is observed that residual deformation occurs in the first test of the structure,which is attributed to the relative sliding between the skin and frame because of bolt-hole clearances.The high tightening torque and the increased number of the skin-frame bolts contribute to the high stiffness of the structure.A finite element model(FEM)of this composite structure is established,and the simulation model is verified by the experimental results.The FEM is contrastively analyzed with different frame joints,and it is found that adhesive joining in the hybrid bonded/bolted joints enhances the stiffness of the structure significantly.Given that adhesive plays a leading role in the stiffness of the hybrid joints,Tie contact in FEM is proposed to simulate bonded or hybrid joints when studying the stiffness performance of undamaged structure.
