弧光灯热流标定系统光源的仿真设计

Simulation Design of the Arc Lamp System for Heat Flux Sensor Calibration

为改进现有弧光灯热流标定系统的光源装置,有必要对其进行仿真研究。以等亮度曲线分布为依据设计了氙灯模型,计算了氙灯发光功率的分布,借助角度切趾文件模拟了氙灯发光角度分布,然后建立了整个标定光源装置的仿真模型,计算了积分器出口处的辐照度。与实验数据比较,4种积分器出口平均辐照度实验值相对仿真值损失了约49%,且这种损失随着积分器口径增大而增大。经分析验证,仿真值损失的主要原因是实验所用椭球镜聚焦率比设计值衰减了约40%,损失会随着积分器口径增大的主要原因是所建氙灯模型较好地模拟了氙灯发光功率密度由阴极到阳极递减这一特征。

To improve on the lamp source set of the system for the heat flux sensor calibration, the simulation study is implemented in the paper. Based on the luminance distribution, the composition of xenon short arc lamp is designed and its power distribution is calculated. The angle distribution is simulated by angular apodization files. Then the model of the lamp source set is built and the radiation on the exit of the integrator is calculated. Compared with the test result, the average radiation on the exit of the integrator in test deduces about 49% and the loss of radiation increases with the increasement of the caliber of the integrator. By theoretical analyzing and experimental verifying, the loss of radiation is because the collection efficiency of the ellipsoidal specular reflector falls by 40% in test. And the reason why the loss increases with caliber of integrator is that the xenon short arc lamp model in this paper reflects well the feature that the density of the power of xenon short arc lamp descends from the cathode to the anode.