The decay of thermal emission of rough surface layers of different carbon materials under the pulsed laser excitation is analyzed both theoretically and experimentally. For pulsed laser heating of rough surfaces, computer simulations revealed that laser-induced thermal radiation is mainly emitted by peaks of the surface relief, and the emission decay time depends on the relation between the laser penetration depth and the temperature diffusion length. It is also concluded that the presence of surface roughness can significantly increase the emission decay time. In the experiments, carbon materials with different thermal characteristics were used; however, all of the investigated samples demonstrated close values of the emission decay time. This fact shows that the material's characteristics on the peaks of surface relief are similar for different carbon materials at high temperature.The decay of thermal emission of rough surface layers of different carbon materials under the pulsed laser excitation is analyzed both theoretically and experimentally. For pulsed laser heating of rough surfaces, computer simulations revealed that laser-induced thermal radiation is mainly emitted by peaks of the surface relief, and the emission decay time depends on the relation between the laser penetration depth and the temperature diffusion length. It is also concluded that the presence of surface roughness can significantly increase the emission decay time. In the experiments, carbon materials with different thermal characteristics were used; however, all of the investigated samples demonstrated close values of the emission decay time. This fact shows that the material's characteristics on the peaks of surface relief are similar for different carbon materials at high temperature.

中文翻译：

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粗糙碳表面的激光诱导热发射

从理论上和实验上分析了脉冲激光激发下不同碳材料粗糙表面层的热发射衰减。对于粗糙表面的脉冲激光加热，计算机模拟表明，激光诱导的热辐射主要由表面起伏的峰值发射，发射衰减时间取决于激光穿透深度和温度扩散长度之间的关系。还得出结论，表面粗糙度的存在可以显着增加发射衰减时间。实验中使用了不同热特性的碳材料；然而，所有研究的样品都显示出接近的发射衰减时间值。这一事实表明，材料' 不同碳材料在高温下表面起伏峰的特征相似。从理论上和实验上分析了不同碳材料粗糙表面层在脉冲激光激发下的热辐射衰减。对于粗糙表面的脉冲激光加热，计算机模拟表明，激光诱导的热辐射主要由表面起伏的峰值发射，发射衰减时间取决于激光穿透深度和温度扩散长度之间的关系。还得出结论，表面粗糙度的存在可以显着增加发射衰减时间。实验中使用了不同热特性的碳材料；然而，所有研究的样品都显示出接近的发射衰减时间值。这一事实表明，不同碳材料在高温下表面起伏峰上的材料特性是相似的。