红外探测系统的激光辐照热效应仿真分析

袁磊; 王毕艺; 罗超; 郦文忠; 冉均均; 柳建

doi:10.11884/HPLPB202335.220157

红外探测系统的激光辐照热效应仿真分析

doi: 10.11884/HPLPB202335.220157

袁磊^1,,
王毕艺^2, ,,
罗超³,
郦文忠¹,
冉均均¹,
柳建^{1, 3}

1.
成都理工大学工程技术学院，四川乐山 614007
2.
光电信息控制和安全技术重点实验室，天津 300308
3.
核工业西南物理研究院，成都 610225

基金项目: 光电信息控制和安全技术重点实验室开放基金项目(6142107190310)

详细信息

作者简介:
袁　磊，yuanlei11@163.com

通讯作者:
王毕艺，wangbiyi530@163.com

中图分类号: TN215
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- 文章访问数: 657
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- PDF下载量: 72
- 被引次数: 0
出版历程
- 收稿日期: 2022-05-16
- 修回日期: 2022-09-29
- 录用日期: 2022-10-12
- 网络出版日期: 2022-10-17
- 刊出日期: 2023-01-14

Simulation analysis of thermal effect of laser irradiation in infrared detection system

Yuan Lei^1
,,
Wang Biyi^{2
, ,},
Luo Chao³,
Li Wenzhong¹,
Ran Junjun¹,
Liu Jian^{1, 3}

1.
The Engineering & Technical College of Chengdu University of Technology, Leshan 614007, China
2.
Science and Technology on Electro-Optical Information Security Control Laboratory, Tianjin 300308, China
3.
Southwestern Institute of Physics, Chengdu 610225, China

摘要

摘要: 为研究红外探测系统受激光辐照后的热效应与二次热辐射对探测器成像的影响，使用Ansys软件对红外探测器进行热辐射仿真和有限元结构仿真；采用黑体辐射定律和DO辐射计算模型模拟计算探测器内光学系统在不同激光辐照度下的温度随时间变化情况以及探测器内部温升对靶面成像的二次热辐射干扰情况；采用热弹性力学模型仿真计算探测器内部的热应力和热变形情况。结果表明：探测器受到1.06 μm激光照射，矫正镜激光辐照度在50 W/cm²时，靶面受到二次热辐照度在0.6 s时达到100 μW/cm²的量级，使红外探测器达到饱和；探测器受激光辐照后系统最高温度出现在矫正镜中心处，拟合得到系统最高温度与受照时间函数关系，可预测探测器升温结构破坏；最大热变形出现在矫正镜背面中心处，由外向内形成不等附加光程差，干扰探测器的成像效果；最大热应力出现在矫正镜前面中心处，得到最大热应力与激光辐照度间的线性关系曲线，为矫正镜热应力破坏提供预测参数。
- 红外探测 /
- 成像质量 /
- DO辐射模型 /
- 热弹性力学模型 /
- 二次热辐射
Abstract: To study the thermal effect and secondary thermal radiation of infrared detection system after laser irradiation on the detector imaging, this paper uses Ansys software for thermal radiation simulation and finite element structure simulation of infrared detector. The blackbody radiation law and DO radiation calculation model are used to simulate the temperature variation with time of the optical system in the detector under different laser irradiance and the interference of the secondary thermal radiation caused by the temperature rise in the detector to the imaging of the target surface. The thermal stress and deformation in the detector are simulated by thermoelastic model. The results show that, under the condition that the detector is irradiated by 1.06 μm laser while the laser irradiance of the corrective lenses is 50 W/cm², then, the secondary thermal irradiance of the target reaches the order of 100 μW/cm² in 0.6 seconds, the infrared detector reaches saturation. After the detector is irradiated by laser, the maximum temperature of the system appears at the center of the corrective lenses, and the function relationship between the maximum temperature of the system and the exposure time is obtained by fitting, which can predict the damage of the heating structure of the detector. The maximum thermal deformation appeared at the center of the back of the mirror, which formed unequal additional optical path difference from the outside to the inside and interfered with the imaging effect of the detector. The maximum thermal stress appeared in the front center of the corrective lenses, and the linear relationship between the maximum thermal stress and the laser irradiance was obtained, which provide the prediction parameters for the thermal stress damage of the corrective lenses.
- infrared detection /
- image quality /
- DO radiation model /
- thermoelastic model /
- secondary heat radiation

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图 1 探测器结构及光路图

Figure 1. Diagram of detector structure and optical path

下载: 全尺寸图片幻灯片

图 2 探测器网格模型

Figure 2. Detector grid model

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图 3 50 W/cm²平均激光辐照度下照射10 s内各镜片温度变化曲线

Figure 3. Temperature curve of each lens within 10 s after irradiation with average laser irradiance of 50 W/cm²

下载: 全尺寸图片幻灯片

图 4 不同激光辐照度下系统最高温度随时间变化情况

Figure 4. Maximum temperature of the system varies with time under different laser irradiance

下载: 全尺寸图片幻灯片

图 5 探测器受激光辐照10 s时的热应变云图

Figure 5. Thermal strain cloud image of detector irradiated by laser for 10 s

下载: 全尺寸图片幻灯片

图 6 探测器受激光辐照10 s时镜片热应力云图

Figure 6. Thermal stress cloud images of detector irradiated by laser for 10 s

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图 7 矫正镜在不同激光辐照度下镜面热变形量

Figure 7. The thermal deformation of the mirror under different laser irradiance

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图 8 靶面受二次辐照随时间变化曲线

Figure 8. Curve of the amount of secondary irradiation on target surface with time

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表 1 模型参数表

Table 1. Model parameter list

parts	geometric radius/mm	waist radius/mm	grid type	grid size/mm	grid number
primary mirror	51	51	Hex	3	2100
secondary mirror	18.5	18.5	Hex	3	417
corrective lens	12.5	8	Hex	1.5	786
target	5.5	—	Hex	1	449
hood	125	51	Hex	3	24858
fluid	150	—	Tet	6	1116834

下载: 导出CSV

表 2 材料参数表

Table 2. Material parameters

material	density/（kg·m⁻³）	specific heat capacity/J·（kg·K）⁻¹	thermal conductivity/W·(m·K)⁻¹	absorption coefficient/m⁻¹	refractive index
Si	2328.3	700	148	864	1.5
MgF₂	3177	1003	0.3	1.4	1.48
Al	2700	934.92	237	17	1
Air	1.225	1006.43	0.0242	0	1

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表 3 材料物性参数表

Table 3. Material property parameters

material	density/（kg·m⁻³）	elasticity modulus/GPa	Poisson ratio	dilatation coefficient/K⁻¹	melting point/K
Si	2330	190	0.24	2.5×10⁻⁶	1687
MgF₂	3177	1.32	0.276	7×10⁻⁶	1528
Al	2700	70	0.3	2.46×10⁻⁶	933

下载: 导出CSV

表 4 探测器在不同激光辐照度下10 s时的最大热应力和热应变表

Table 4. Maximum thermal stress and thermal strain of the detector for 10 s irradiation at different laser irradiance

irradiation intensity/（W·cm⁻²）	maximum stress/MPa	maximum strain/μm
50	78.2	4.4
100	156.5	8.8
300	476.7	26.38
500	773.1	43.6

下载: 导出CSV

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