中文摘要：

为了得到激光辐照下尼龙材料的烧蚀规律,利用红外成像的方法分析了近红外连续激光辐照尼龙材料引起的热烧蚀现象.用摄像机和红外热像仪记录了尼龙材料在烧蚀过程中的主要现象和温度变化过程,并对实验结果与ANSYS仿真结果进行了对比.使用波长为976 nm,输出功率密度为1×10^5 W/m2、光斑高斯半径为10 mm的光束对尼龙材料进行照射的结果显示：开始时尼龙材料温度迅速上升,发生膨胀,并逐渐熔融分解;随着照射时间的增加,尼龙材料温度变化变缓,熔融部分向光斑边缘退化;当达到一定温度时,材料温度不再升高.由于受光束质量、材料性能不均匀、熔融部分向边缘退化等因素影响,得到的实验烧蚀结果与理论烧蚀结果稍有差异,但基本吻合,验证了实验方法及ANSYS数值仿真方案的可行性.

英文摘要：

To obtain the thermal ablation law of nylon materials under laser irradiation,the infrared imaging was used to explore thermal ablation phenomena of nylon materials under continuous infrared laser irradiation.A camera and an infrared thermal imager were used to record the main phenomena of laser ablation and its temperature field,and a comparison between experiment results and ANSYS simulation was performed.When the nylon was irradiated by using a 976 nm laser beam with an output power density of 1 × 105 W/m2 and a spot semi-diameter of 10 mm,the experiments show that the temperature of nylon rises quickly at first,then,expands,melts and decomposes.As time goes on,the temperature of nylon changes slowly,and the melted parts degenerate into the spot edge.When the temperature of nylon reaches certain value,it is no longer rise.Affected by beam quality,material heterogeneous,melted parts degenerated and so on,it indicates that the experimental ablation results and the theoretical results are slightly different,but basically acceptable,which verifies the feasibility of the proposed method and ANSYS simulation.