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为了提高高能激光能量测量的精确度,减小不准确度,给出了一种吸收腔结构,对基于量热法的吸收腔的内、外壁温度差特性进行了理论研究和实验验证。用一维非线性傅里叶热传导方程分别建立了吸收腔在激光加热过程中和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ANSYS软件,根据激光加热的原理,建立了仿真模型,并用模型对理论分析结果作数值仿真。理论分析结果与实验数据非常接近。在激光照射过程中,虽然吸收腔内、外壁存在渐趋固定的温度差,但当照射结束后,该温差迅速减小,吸收腔到达平衡。
In order to improve the accuracy of high-energy laser energy measurement and reduce the inaccuracy, a kind of absorption chamber structure is given, and the temperature difference characteristics of the inner and outer walls of the absorption chamber based on calorimetry are theoretically studied and verified. The temperature distribution of the absorption cavity during laser heating and after the heating is established by using the one-dimensional nonlinear Fourier heat conduction equation. Simulation experiments were carried out to simulate the process of laser irradiation of the absorption chamber, and experimental data of the temperature difference between the inner and outer walls were obtained. Using ANSYS software, according to the principle of laser heating, a simulation model is established, and the theoretical analysis results are simulated by using the model. Theoretical analysis and experimental data are very close. In the process of laser irradiation, although there is a fixed temperature difference between the inner and outer walls of the absorption chamber, the temperature difference rapidly decreases when the irradiation ends, and the absorption chamber reaches equilibrium.