绝对式高能量激光能量计温度特性研究

Research on Temperature Characteristics of Absolute Calorimetric Energy Meter for High-Energy Laser

对绝对式量热法高能量激光能量计吸收腔的内、外壁温度差特性进行了详细的理论研究和实验验证。用第二非齐次边界条件和第二齐次边界条件的热传导方程分别建立了吸收腔在激光加热过程中和激光加热结束后的温度分布,利用模拟实验对激光照射吸收腔的过程进行模拟,得到内、外壁温度差的实验数据。利用数值模拟法,对理论分析结果作数值分析,理论分析结果与实验数据非常接近,从而证明了在激光加热过程中,虽然吸收腔内外壁存在固定的温度差,但当激光结束后,该温度差将迅速减小,吸收腔达到热平衡。

The temperature differential characteristics of inner and outer faces of absorbing cavity used in absolute calorimeter laser energy meter is studied theoretically and verified experimentally. Firstly, with the thermal conduction equations of second homogeneous boundary and non-homogeneous boundary condition, we gained the temperature distribution in and after the heating process of the absorbing cavity. Secondly, through the simulation for the process of laser heating of the absorbing face, we obtained the expermental data of the temperature difference. In the end, with numerical simulation method, the theoretic results are analyzed numerically. The experimental data is very close to the theoretic analysis result, which proved that though fixed temperature difference is existed during laser heating, it will be soon reduced and the absorbing cavity will reach the heat balance after laser heating is finished.