高能脉冲激光作用下材料表面温度变化的实验研究

Experimental investigation of surface temperature change of material in high energy pulse laser irradiation

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”

This paper describes an experimental investigation of temperature change of materials surface which is irradiated by high energy pulse laser.Through experiments the temperature increasing rate and the temperature profiles of materials surface in laser irradiation could be obtained.By comparing the profiles of surface temperature of material which is irradiated by high energy pulse laser with different parameters,It conld be found that the power density of laser influences the range of temperature rise and rise rating,and pulse duration of laser influences trend of surface temperature change.With decreasing of pulse duration,the temperature of materials surface gradually defers from the numerical simulation result based on Fourier' Law,and some unconventional phenomena appear,such as 'the second heating”.