水循环式激光能量计温度响应建模

Modeling of temperature response of water-cycled laser calorimeter

随着激光技术的飞速发展,激光的输出能量越来越高,带来了激光能量参数测量方面的新问题。为了研究水冷却技术在能量计中的应用,对水循环式激光能量计的热传导过程进行了分析,将非稳态的传热过程离散成连续反馈的微型稳态传热过程,建立了一个计算模型。模型的计算结果表明,能量计输出温度曲线出现了类阻尼振荡特征。探索了曲线特征成因,得到类阻尼振荡现象的主要影响因素为激光辐照区域与无热源区域的比例。根据模型参数搭建模拟装置,通过实验验证了计算得到的曲线特征。

With a rapid development, the output energy of lasers are more and more higher. It causes new trouble about laser energy measurment. In order to apply water cooling technology to calorimeter, the heat conduction process in calorimeter was studied. But for modeling and calculation simplification, the transient process was broken up into several little processes which were steady, and these little processes feeded their calculation result back to the next ones continuously. Based on the analysis, a program model was built. The calculation results show that damping-like oscillating characteristics exist in the temperature curves. The damping oscillation reason was analyzed. The primary effect factor of damping oscillation was found to be the ratio of region with laser lighting to that without heat sources. According to parameters of program model, simulation units were built. Thus the curves characteristics were verified by experiment.