为了提高CMOS图像传感器热电制冷系统的工作性能,解决CMOS图像传感器工作时由于积热导致的暗电流问题,提出了基于模型辨识的CMOS图像传感器热电制冷系统滑模控制方法.分析了CMOS图像传感器热电制冷系统的传热机理,进而建立了CMOS图像传感器热电制冷系统在工作点附近的控制模型.针对辨识出的模型在不同工作点参数变化较大的问题,设计了对CMOS图像传感器热电制冷系统参数变化不敏感的基于指数趋近律的滑模控制器,以提高系统的鲁棒性.利用Matlab/Simulink对系统进行仿真分析,仿真结果表明:相比于传统的PID控制算法,滑模控制方法的动态响应和稳态精度均更优.最后,在实际的CMOS图像传感器热电制冷控制系统中进行了实验测试,结果表明:室温20℃的条件下,输入不同的温度指令滑模控制算法的稳态误差均小于PID控制算法,为±0.1℃,满足CMOS图像传感器热电制冷控制系统的温控精度的要求.

轫致辐射是第三代先进同步辐射光源光束线站辐射屏蔽的重点.上海光源(Shanghai Synchrotron Radiation Facility,SSRF)是国际上正在运行的第三代先进同步辐射光源之一.上海光源蛋白质微晶结构光束线(BL18U)线站是正在试运行中的光束线站.本文采用FLUKA软件模拟计算了蛋白质微晶结构光束线(BL18U)线站因轫致辐射的散射和光中子引起的辐射剂量率分布.分析了因狭缝开孔尺寸、储存环内流强的变化所引起的辐射剂量变化.用高灵敏度的光子和中子探测器测量了BL18U光学棚屋外的光子和光中子剂量率.测量结果表明模拟计算的可靠性.本研究采用的模拟和测量方法可用于其它线站的辐射剂量水平评估,并为上海光源后续线站的屏蔽设计提供参考.

VLBI(Very Long Baseline Interferomerty) is a kind of technology with very high space angular resolution,and it is widely used in the precise deep space explorer tracking.The software correlator,a novel and key VLBI data process technique,has received more and more recognition and become practical in the deep space tracking.The domestic research group also began studies on the software correlator lately and got fruitful results.A software correlator system specialized in the deep space tracking was successfully developed.With the functions of fast fringe search and phase calibration abstraction,this correlator was used in the first European circumlunar explorer joint trace experiment performed by the Chinese VLBI network.It has been applied in the Chinese lunar exploration project.With the characteristic of flexible structure,scalability,new algorithm fusion ability,the software correlator is especially suitable for deep space TT&C.In fact,along with the dramatic development of computer the VLBI software correlator will take greater effect in the deep space exploration.