EMCCD相机热电制冷温度控制系统设计

发布时间：2018-04-14 11:07

  本文选题：EMCCD + 热电制冷　； 参考：《中国科学院大学(中国科学院光电技术研究所)》2017年硕士论文

【摘要】：EMCCD作为当今世界上一种高速高灵敏度的图像传感器,在航空航天、夜视导航、生物医学等众多应用方向有着广阔的应用前景。为了减小其热生暗电流的影响并提高其电子倍增增益,需要对其进行深度制冷,同时为了使其电子倍增增益稳定,需使制冷温度具有极高的稳定度。此外,为了减小温度变化对相机的冲击,在制冷时,应使温度变化速率较慢。因此,对EMCCD进行高稳定度的深度制冷并保证合适的温度变化速率显得尤为重要。为满足以上要求,本文设计了一种制冷控制系统,该系统以TMS320F28335数字信号处理器作为主控芯片,利用PT1000温度传感器采集EMCCD相机芯片的温度数据,然后系统以此为参数,采用积分限幅的PID控制算法计算出控制量,通过设置TEC两端电压从而控制EMCCD芯片温度。本文首先论述了EMCCD的应用前景以及对其进行高稳定性的深度制冷的重要性。之后,根据制冷性能的要求以及已有的实验条件,设计了基于TMS320F28335的控制系统,并选择了满足系统需求的各种元器件。控制系统硬件电路包括:基于PT1000和AD590温度传感器的测温电路、AD转换电路、DSP核心控制电路、基于DA转换器和OPA549的驱动电路和基于MOS管开关的桥式驱动电路并制作了温控电路板。然后,根据所用的资源和系统的特性,完成了以积分限幅的PID控制算法为核心的软件设计并在Matlab/simulink上做了常规数字PID算法和积分限幅PID控制算法的系统仿真对比。最后,在搭建好的实验平台上完成了温度控制实验。Matlab/simulink仿真结果表明,使用积分限幅的PID控制算法的控制系统在超调量和控制稳定性上均优于常规PID控制算法。实验结果表明该系统可在为TEC提供较大制冷功率的情况下使控温稳定度≤±0.1℃,温度变化速率小于5℃/min,均满足系统性能要求。
[Abstract]:As a high speed and high sensitivity image sensor in the world, EMCCD has a broad application prospect in aerospace, night vision navigation, biomedicine and many other applications.In order to reduce the influence of the thermal dark current and increase the electron multiplication gain, it is necessary to conduct deep refrigeration. In order to stabilize the electron multiplication gain, it is necessary to make the refrigeration temperature extremely stable.In addition, in order to reduce the impact of the temperature change on the camera, the temperature change rate should be slower.Therefore, it is very important for EMCCD to be cooled in depth with high stability and suitable temperature change rate.In order to meet the above requirements, a refrigeration control system is designed in this paper. The TMS320F28335 digital signal processor is used as the main control chip, and the temperature data of the EMCCD camera chip is collected by using the PT1000 temperature sensor, and then the system takes this as the parameter.The PID control algorithm with integral limit is used to calculate the control quantity, and the temperature of EMCCD chip is controlled by setting the voltage at both ends of TEC.In this paper, the application prospect of EMCCD and the importance of deep refrigeration with high stability are discussed.Then, according to the requirement of refrigeration performance and the existing experimental conditions, the control system based on TMS320F28335 is designed, and various components to meet the requirements of the system are selected.The hardware circuit of the control system includes: the temperature measuring circuit based on PT1000 and the AD590 temperature sensor and the AD converting circuit; the driving circuit based on DA converter and OPA549; the bridge drive circuit based on MOS switch; and the temperature control circuit board is made.Then, according to the resources and the characteristics of the system, the software design of the PID control algorithm based on the integral limit is completed, and the system simulation comparison between the conventional digital PID algorithm and the integral limiting PID control algorithm is made on the Matlab/simulink.Finally, the temperature control experiment. Matlab / Simulink simulation results show that the PID control system using integral limiting algorithm is superior to the conventional PID control algorithm in overshoot and control stability.The experimental results show that the system can make the temperature control stability 鈮，

本文编号：1749024