激光脉冲宽度对长脉冲激光能量在线测量装置的影响

Effect to Online Energy Measurement Device for Long-Pulse Laser by Laser Pulse Width

长脉冲激光能量在线测量装置中热桥的存在加剧了热传导的影响,为了定量地确定其大小并对其进行修正开展了此项研究。将温升曲线分成3部分,利用傅里叶定律、热传导方程及能量守恒定律对每一部分逐一进行了分析,得到能量损失的比例与装置参数之间的关系,开展了实验研究,通过对实验数据的拟合,结果表明,热损失比率由脉冲宽度、材料的导热系数、热桥的长度、吸收体的质量等决定。上述参数需根据实验间隔及测量精度要求确定,推导出来的理论值与实验结果一致性较好,其偏差为2.9%。

Heat bridge in the online energy measurement device for long-pulse laser enhances heat conduction effect. The research was done to assure the value of the effect on measurement result so as to correct the measurement result.Curves of temperature was divided into three parts,each part was analyzed with Fourier heat law,heat conduction equations and energy conservation law.Relationship between energy loss and device parameter was obtained,and experiment research was done.Experiment data was fitted and conclusion was drawn：heat loss rate is decided by pulse length,heat conduction coefficient of material,length of heat bridge,quality of heat absorption body,and et al..These parameters are decided according to experiment interval and precision requirement.Theory value and experiment result have a good coherence.Its deviation is 2.9%.