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首页> 外文会议>Conference on Modeling and Characterization of Light Sources, Jul 8-9, 2002, Seattle, USA >Numerical modeling of an integrating sphere radiation source
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Numerical modeling of an integrating sphere radiation source

机译：积分球辐射源的数值模拟

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Integrating spheres are often used as calibration sources providing uniform radiance within a solid angle and/or uniform irradiance at a distance. The best performance in such a system can be achieved if one is able to evaluate as well as predict the important characteristics of the sphere system's output, such as the spatial and angular distributions of radiance over the exit port, or the distribution of irradiance at the external plane of calibration. We have developed the algorithms and specialized software based on Monte Carlo techniques to solve the problem of radiation transfer inside an integrating sphere containing several point sources and conical annular baffle. The new algorithm employs backward ray tracing coupled with the "shadow rays" technique. As a timesaving procedure, the axial symmetry of the sphere and the superposition principle are used to substitute the sum of single source radiation fields rotated through a specific angle, for the radiation field of the complete multiple source sphere. The random (due to the stochastic character of the Monte Carlo method) component of uncertainty for the radiance or irradiance results is less than 0.1%. The results of numerical experiments are used to establish the performance variation as a function of the reflectance and specularity of the sphere wall, the number of radiation sources, the type of baffle used, and the angular distribution of their radiant intensity.
机译：积分球通常用作校准源，在立体角内提供均匀的辐射度和/或在远处提供均匀的辐照度。如果人们能够评估并预测球体系统输出的重要特征，例如出口上辐射的空间和角度分布，或者出口处的辐照度分布，则可以在这种系统中获得最佳性能。外部校准平面。我们已经开发了基于蒙特卡洛技术的算法和专用软件，以解决包含多个点源和圆锥形环形挡板的积分球内部的辐射传输问题。新算法采用了反向射线跟踪和“阴影射线”技术。作为一种节省时间的程序，球体的轴对称性和叠加原理用于将旋转特定角度的单源辐射场的总和替换为完整的多源球体的辐射场。辐射或辐照度结果的不确定性的随机（由于蒙特卡洛方法的随机性）分量小于0.1％。数值实验的结果用于确定性能变化与球体壁的反射率和镜面度，辐射源的数量，所用挡板的类型以及辐射强度的角度分布的关系。

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