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激光辐照CCD图像探测器时可造成对探测器的干扰和破坏,为了增强激光对CCD探测器的损伤效果,提出了一种混合频率激光干扰方法,这种方法是将高重频激光和低重频激光耦合,使其同时作用于CCD探测器。基于热传导和热弹性力学的基本关系式建立了混合频率激光辐照CCD探测器遮光铝膜层的热力耦合数学物理模型,对热传导方程和应力平衡方程进行半解析求解,计算得到不同工作模式的激光辐照CCD探测器的遮光铝膜层的瞬态温度场和热应力场,并通过数值仿真定量地比较了不同工作模式激光光源对CCD的损伤效果。结果表明:相对于高重频激光和低重频激光单独作用探测器的情况,混合频率激光将会对CCD产生更加严重的损伤效应。
Laser radiation CCD image detector can cause interference and damage to the detector. In order to enhance the laser damage effect on the CCD detector, a hybrid frequency laser jamming method is proposed, this method is to high-frequency laser and low Re-frequency laser coupling, so that it simultaneously acts on the CCD detector. Based on the basic relationship between heat conduction and thermo-elasticity, a thermodynamic coupling mathematical physics model of aluminum film with mixed frequency laser-irradiated CCD detector is established. The heat conduction equation and stress equilibrium equation are solved semi-analytically. The laser modes of different working modes The transient temperature field and thermal stress field of the light-shielding aluminum film irradiated by the CCD detector were measured. The damage effect of the laser light source with different working modes on the CCD was quantitatively compared by numerical simulation. The results show that the mixed frequency laser will have a more serious damage effect on the CCD than the detector with high repetition frequency laser and low repetition frequency laser.