毫秒脉冲激光致CCD探测器损伤的热力学研究

发布时间：2018-06-12 04:49

本文选题：毫秒脉冲激光 + 温升　；参考：《长春理工大学》2017年硕士论文

【摘要】：本文针对毫秒脉冲激光辐照行间转移型彩色面阵CCD探测器的热力损伤过程进行了理论和实验两方面研究。理论研究方面,基于热传导方程和热弹性力学方程,建立毫秒脉冲激光辐照行间转移型彩色面阵CCD多层结构的三维热力耦合物理模型。针对行间转移型彩色面阵CCD探测器的特殊结构,利用COMSOL Multiphysics有限元模拟软件对毫秒脉冲激光作用行间转移型彩色面阵CCD的损伤过程进行仿真模拟。得到行间转移型彩色面阵CCD探测器在不同激光能量密度和脉冲宽度的条件下的瞬态温度场与应力场的时间、空间分布,并对其变化规律进行分析。在实验研究方面,搭建毫秒脉冲激光辐照行间转移型彩色面阵CCD探测器的损伤测试实验系统,通过该系统对毫秒脉冲激光辐照行间转移型彩色面阵CCD探测器的热力损伤过程进行实验研究。得到CCD表面中心点温度、表面形貌、视频图像、移位寄存器的传输时钟和复位时钟信号随激光能量密度和脉冲宽度的变化规律,并对实验结果进行分析。对比仿真和实验的结果,可以发现两者的规律基本相同。说明本文建立的热耦合模型具有一定的准确性。通过对毫秒脉冲激光辐照行间转移型彩色面阵CCD探测器的热力损伤的理论和实验研究,最终得出结论:毫秒脉冲激光对行间转移型彩色面阵CCD探测器的破坏主要是由热力损伤造成的。本文研究结果为激光对CCD探测器的损伤研究和激光加工技术的改进及完善工作,提供了理论基础。
[Abstract]:In this paper, the thermal damage process of interline transfer color array CCD detector irradiated by millisecond pulse laser is studied theoretically and experimentally. In theory, based on heat conduction equation and thermoelastic equation, a three-dimensional thermo-mechanical coupled physical model of interline transfer color array CCD multilayer structure irradiated by millisecond pulse laser is established. Aiming at the special structure of the interline transfer color array CCD detector, the damage process of the interline transfer color array CCD under the action of millisecond pulse laser is simulated by using COMSOL Multiphysics finite element simulation software. The temporal and spatial distribution of transient temperature field and stress field of interline transfer color array CCD detector under different laser energy density and pulse width are obtained, and its variation law is analyzed. In the aspect of experimental research, the damage test system of interline transfer color array CCD detector irradiated by millisecond pulse laser is built. The thermal damage process of interline transfer color array CCD detector irradiated by millisecond pulsed laser is studied experimentally. The changes of CCD surface center temperature, surface morphology, video image, shift register transmission clock and reset clock signal with laser energy density and pulse width are obtained, and the experimental results are analyzed. By comparing the simulation results with the experimental results, it can be found that the laws of the two are basically the same. It shows that the thermal coupling model established in this paper has certain accuracy. Theoretical and experimental study on thermal damage of interline transfer color array CCD detector irradiated by millisecond pulsed laser is carried out. Finally, it is concluded that the damage of interline transfer color array CCD detector caused by millisecond pulse laser is mainly caused by thermal damage. The results of this paper provide a theoretical basis for the study of laser damage to CCD detectors and the improvement and improvement of laser processing technology.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN249;TN386.5

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