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通过在高能脉冲激光照射下材料表面温度变化的实验研究 ,测量了在高能量、极短时间尺度、温度变化率极大的情况下材料表面的温升速率和温度变化规律。通过比较在不同参数的高能脉冲激光加热下材料表面温度的变化曲线 ,发现激光脉冲的功率密度会影响材料表面温度的温升和温升速率 ,脉冲宽度影响材料表面温度的变化趋势。随着激光脉冲宽度的减小 ,材料表面温度变化会出现由符合傅立叶导热规律向偏离傅立叶导热规律的逐渐转变 ,出现了“二次升温”等非常规现象
Through the experimental research on the temperature change of material surface under the irradiation of high energy pulsed laser, the temperature rising rate and temperature change of material surface under high energy, very short time scale and great temperature change rate were measured. By comparing the curve of the surface temperature under high energy pulse laser heating with different parameters, it is found that the power density of the laser pulse affects the temperature rise and the temperature rise rate of the material surface. The pulse width affects the trend of the material surface temperature. With the decrease of the laser pulse width, the surface temperature change of the material will appear the gradual change from the rule of Fourier heat conduction that deviates from the Fourier heat conduction law, and the unconventional phenomena such as “second temperature rise”