本文選題：EMCCD + 熱電制冷��； 參考：《中國科學(xué)院大學(xué)(中國科學(xué)院光電技術(shù)研究所)》2017年碩士論文

【摘要】：EMCCD作為當今世界上一種高速高靈敏度的圖像傳感器,在航空航天、夜視導(dǎo)航、生物醫(yī)學(xué)等眾多應(yīng)用方向有著廣闊的應(yīng)用前景。為了減小其熱生暗電流的影響并提高其電子倍增增益,需要對其進行深度制冷,同時為了使其電子倍增增益穩(wěn)定,需使制冷溫度具有極高的穩(wěn)定度。此外,為了減小溫度變化對相機的沖擊,在制冷時,應(yīng)使溫度變化速率較慢。因此,對EMCCD進行高穩(wěn)定度的深度制冷并保證合適的溫度變化速率顯得尤為重要。為滿足以上要求,本文設(shè)計了一種制冷控制系統(tǒng),該系統(tǒng)以TMS320F28335數(shù)字信號處理器作為主控芯片,利用PT1000溫度傳感器采集EMCCD相機芯片的溫度數(shù)據(jù),然后系統(tǒng)以此為參數(shù),采用積分限幅的PID控制算法計算出控制量,通過設(shè)置TEC兩端電壓從而控制EMCCD芯片溫度。本文首先論述了EMCCD的應(yīng)用前景以及對其進行高穩(wěn)定性的深度制冷的重要性。之后,根據(jù)制冷性能的要求以及已有的實驗條件,設(shè)計了基于TMS320F28335的控制系統(tǒng),并選擇了滿足系統(tǒng)需求的各種元器件�？刂葡到y(tǒng)硬件電路包括:基于PT1000和AD590溫度傳感器的測溫電路、AD轉(zhuǎn)換電路、DSP核心控制電路、基于DA轉(zhuǎn)換器和OPA549的驅(qū)動電路和基于MOS管開關(guān)的橋式驅(qū)動電路并制作了溫控電路板。然后,根據(jù)所用的資源和系統(tǒng)的特性,完成了以積分限幅的PID控制算法為核心的軟件設(shè)計并在Matlab/simulink上做了常規(guī)數(shù)字PID算法和積分限幅PID控制算法的系統(tǒng)仿真對比。最后,在搭建好的實驗平臺上完成了溫度控制實驗。Matlab/simulink仿真結(jié)果表明,使用積分限幅的PID控制算法的控制系統(tǒng)在超調(diào)量和控制穩(wěn)定性上均優(yōu)于常規(guī)PID控制算法。實驗結(jié)果表明該系統(tǒng)可在為TEC提供較大制冷功率的情況下使控溫穩(wěn)定度≤±0.1℃,溫度變化速率小于5℃/min,均滿足系統(tǒng)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，

本文編號：1749024