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为了建立基于探头背光面温升测量重构入射激光能量的方法,推导出了单元探头内温度场分布的半解析表达式,分析确定了重构入射激光能量的特征要素。通过引入标定系数,获得了用探头背光面最大温升重构入射激光能量以及计算标定系数的公式。数值计算讨论了探头尺寸(圆柱体探头的直径与长度)、入射激光特性(表面反射系数与照射时间)、环境条件(环境温度与对流换热系数)对标定系数的影响。通过对重构能量的对流-辐射和靶面反射系数修正,使修正后的重构算法适用于不同环境条件下、对不同波长激光远场参数测量的需求,且量热阵列各单元测量结果有很好的一致性,可有效地提高远场激光能量的测量精度。
In order to establish a method to reconstruct the incident laser energy based on the temperature rise of the probe’s back surface, a semi-analytical expression of the temperature field distribution in the unit probe was deduced. The characteristic elements of the incident laser energy were reconstructed. By introducing the calibration coefficient, the formula of reconstructing the incident laser energy with the maximum temperature rise of the back surface of the probe and calculating the calibration coefficient is obtained. The influence of the incident laser characteristics (surface reflection coefficient and irradiation time), environmental conditions (ambient temperature and convection heat transfer coefficient) on the calibration coefficients is discussed in the numerical calculation of the probe dimensions (diameter and length of the cylindrical probe). By revising the convection-radiation of reconstruction energy and the reflection coefficient of target surface, the modified reconstruction algorithm can be applied to the measurement of far-field laser parameters of different wavelengths under different environmental conditions, and the measurement results of each unit of the calorimeter array are Good consistency, can effectively improve the far-field laser energy measurement accuracy.