# 室温及中低温度下K9玻璃镜片的微小形变研究 Study on Micro-Deformation of K9 Glass at Room, Low and Medium Temperature

DOI: 10.12677/APP.2019.93016, PDF, HTML, XML, 下载: 476  浏览: 1,912  科研立项经费支持

Abstract: K9 glass is one of the most important and commonly used components in modern optical systems. In order to study the effect of micro deformation on optical system imaging at room, medium and low temperature, a geometric model with diameter of 40 mm and thickness of 2 mm was constructed. The ANSYS finite element analysis method was used to simulate the micro deformation and thermal strain of K9 glass under two conditions, one was keeping the ambit temperature constant, meanwhile changing the temperature of the thermal load, the other was that keeping the temperature of the thermal load constant, meanwhile changing the ambit temperature. When the ambit temperature was 18˚C, the thermal deformation of K9 glass increased about 170 nm at every 1˚C increase of the thermal load. When the thermal load temperature was fixed at 35˚C, the thermal deformation of glass increased about 1170 nm as the environmental temperature increasing every 10˚C. In addition, the simulation results are combined with laser speckle interference, and the changes of optical path imaging were simulated and analyzed when the thermal deformation was 0.1 μm, 0.25 μm and 0.35 μm. It was concluded that the micro deformation of K9 glass at room, low and medium temperature had an important influence on the imaging of optical system, and the micro displacement of the lens provides a method of laser speckle interference. The research provided a reference for the of optical system imaging at a region with greater temperature difference and the imaging of the optical system at room temperature and medium low temperature by heat source, and also provided a basis for the study of the subsequent related optical elements.

1. 引言

K9玻璃镜片是一种现代常见的重要光学材料，它被广泛应用于各种光电实验中。目前，针对K9玻璃损伤与探测研究主要集中于高功率激光作用下的理论模拟与实验研究，如：2002年，罗福等报道了光斑尺寸对K9玻璃近红外激光损伤阈值的影响 [1] ；2010年，刘红婕等报道了熔石英表面热致应力对激光损伤行为影响的研究 [2] ；2011年，彭志涛等报道了全内反射照明光学元件损伤检测信噪比分析 [3] ；2017年，易瑔等报道了高能激光与K9玻璃相互作用仿真实验研究 [4] 。实际上，K9玻璃镜片不仅在高温高功率条件下的损伤会对光路造成严重后果，在日常教学与科研工作中，环境温度、外界作用条件的变化对玻璃镜片也是有一定的影响的，很多光电实验都是在室温及中低温环境条件下进行的。因此，研究此时镜片形变在光场中是否可以忽略不计以及对光路的影响和检测其变化有一定意义。

2. K9玻璃模型建立与热形变分析

$\left[K\left(T\right)\right]\left\{T\right\}=\left\{Q\left(T\right)\right\}$ (1)

20℃ 25℃ 30℃35℃

Figure 1. Deformation of K9 glass under different heat source temperature

Figure 2. The relationship between maximum and minimum deformation of K9 glass and the temperature

Figure 3. The different value of maximum and minimum deformation for K9 glass under different temperature

20℃ 25℃ 30℃35℃

Figure 4. Thermal strain of K9 glass under different heat source temperature

Table 1. The relationship between total deformation of K9 glass and the ambient temperature

3. K9玻璃微形变对激光散斑干涉仪成像的影响

Figure 5. Diagram of laser speckle interference

(a) (b) (c) (d)

Figure 6. Laser speckle interferometric fringes

4. 结论

NOTES

*通讯作者。

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