飞秒激光瞬态热反射实验样品台设计

论文总字数：22124字

摘 要

关键词：瞬态热反射系统；飞秒激光；微米；位移平台；三维；

The design of the sample stage for the transient thermal reflection of the femtosecond laser

02011324 Yao JiaWei

Supervised by Bi KeDong

Abstract：The thermal conductivity of the interface is the main embodiment of the cooling capability of the material. And the thermal reflection of the femtosecond laser has the advantages in measuring the thermal conductivity because of its non-contact and no-loss.The direct result of the transient thermal reflection system of the femtosecond laser is the change of the intensity of the probe laser at different time points, and then the optical signal is converted to the electrical signal by the photodiode. During the test, the laser should be focused on the surface of the sample, with the sample size in millimeters and laser beam diameter at the micron scale. Therefore, this paper is mainly to design a sample stage with X, Y, Z 3D mobile function and displacement precision at the micron scale. Based on previous reports about various domestic and foreign displacement platforms, for example, high precision displacement platform without guide rail and friction wheel drive micro displacement experiment platform, and the control system, for example the control system of 3D electronic displacement platform based on single chip microcomputer, experimental platform of micro displacement based on RTW. And take the reference to the original sample stage.We can determine the final design. The sample stage is dominantly consists of manual translation stage, which is driven by a screw micrometer head so that the mobile platform can be controlled at the micron level. The cross roller guide is to ensure the accuracy of mobile platform. And each platform can be moved precisely in a single direction. Through a combination of three single-direction displacement platforms, precise movements in three directions can be realized, so that the sample on the platform can be controlled precisely in three directions.

Key words: Transient thermal reflection system; femtosecond laser; displacement platform; three-dimensional

目 录

1、绪论 5

1.1飞秒激光瞬态热反射实验背景 5

1.2 课题意义 6

1.3 微位移平台研究现状 7

1.4 实验样品台初步设计 9

2、 飞秒激光瞬态热反射实验样品台设计方案 10

2.1 样品台基本构造 10

2.2 位移平台驱动部分 10

2.3位移平台主体部分 12

2.4位移平台导轨部分 13

2.5 位移平台紧固部分 15

2.6位移平台复位部分 15

2.7样品台连接块，底座以及支架 16

3、 飞秒激光瞬态热反射实验样品台设计与计算 19

3.1螺旋测微头的设计 19

3.2支架的设计 19

3.3位移平台主体部分的设计 19

3.4 位移平台导轨的设计计算 19

3.5 样品台弹簧的设计计算 20

3.6 样品台连接部分的设计计算 20

4、 总结与展望 22

致 谢 23

参考文献： 24

飞秒激光瞬态热反射实验样品台设计

1、绪论

1.1飞秒激光瞬态热反射实验背景

目前，微纳米材料的使用越来越频繁，相应的各个实验器材也在向微型化的方向发展，这些器材的尺寸下降到与热载流子的平均自由程一样，日新月异，电子技术也随着科技的进步而迅猛发展，一方面电子元器件的功能与以往相比的到了极大的提高，但是随之而来的问题就是其构造的复杂与组装的密集，从而使其工作时的能耗大大增加，同时也增加了许多散热。所以如何解决器材散热问题就成为了难点。这时，散热材料的界面热导对于提高材料的散热能力就显得非常重要。

界面热导是一个重要参数，它是热量在流过一个两边温度不连续的界面是所形成的^{[1, 2]},界面热导也被人称作Kapitza 热导，而界面热阻就是界面热导的倒数。界面热导的发现是因为前苏联科学家Kapitza 在1941年时，对铜以及液态氮的界面进行研究是而发现的^[3], 其数学表达式定义为:

q=σ Δ T (1)

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