基于碲镉汞红外焦平面探测器的结构与其材料热力学相关特征, 描述了激光辐照碲镉汞红外焦平面探测器造成的损伤机理。根据相关的辐照环境和条件, 通过有限元分析法建立了三维仿真模型。基于COMSOL Multiphysics软件仿真了碲镉汞红外探测器受到波长10.6 μm的激光辐照时, 探测器各部分的温度变化及应力变化情况; 通过数值分析方法, 比较了碲镉汞探测器在经过光斑面积相同。功率不同的激光辐照后, 其表面径向及内部轴向的温度场变化及应力场变化情况。仿真结果表明: 在经过106 W/cm2的连续激光辐照后碲镉汞探测器表面温度与应力快速升高, 造成探测器表面损伤, 同时探测器被辐照部位的温度变化也导致其内部局部应力值变化。将碲镉汞探测器的应力损伤阈值及变化趋势与文献中相关实验数据进行对比, 发现二者结果基本一致, 验证了模型的可行性。

Based on the structure and the thermal-stress properties of materials of mercury cadmium telluride(MCT) infrared focal plane array detector (IRFPA), the damage mechanism of MCT IRFPA caused by laser irradiation was elaborated. Based on the relevant irradiation environment and conditions, a three-dimensional simulation model was established by finite element analysis. Based on COMSOL Multiphysics software, the temperature changes and stress changes of various parts of MCT detector were detected,when irradiated by 10.6 μm laser . The numerical analysis method was used to compare the temperature field changes and stress field changes along the surface radial and internal axial directions of the MCT detector after laser irradiation with different spot power.The numerical analysis method was used to compare the spot area of MCT detectors. Temperature field changes and stress field changes in the radial and internal axial directions of lasers with a constant irradiated area and different constant powers.The simulation results show that the surface temperature and stress of the MCT detector increase rapidly after continuous laser irradiation of 106 W/cm2, causing damage to the detector surface.Meanwhile, the temperature change of the irradiated part of the detector also causes the internal local stress value to change.Through comparing the stress damage threshold and variation trend of the MCT detector with the experimental data in the literature referenced, it is found that the results are basically the same, the feasibility of the model can be verified.