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Monte Carlo modeling of an integrating sphere reflectometer

机译:积分球反射仪的蒙特卡洛建模

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The Monte Carlo method has been applied to numerical modeling of an integrating sphere designed for hemispherical-directional reflectance factor measurements. It is shown that a conventional algorithm of backward ray tracing used for estimation of characteristics of the radiation field at a given point has slow convergence for small source-to-sphere-diameter ratios. A newly developed algorithm that substantially improves the convergence by calculation of direct source-induced irradiation for every point of diffuse reflection of rays traced is described. The method developed is applied to an integrating sphere reflectometer for the visible and infrared spectral ranges. Parametric studies of hemispherical radiance distributions for radiation incident onto the sample center were performed. The deviations of measured sample reflectance from the actual reflectance as a result of various factors were computed. The accuracy of the results, adequacy of the reflectance model, and other important aspects of the algorithm implementation are discussed.
机译:蒙特卡罗方法已应用于为半球方向反射系数测量而设计的积分球的数值建模。结果表明,用于估算给定点处辐射场特征的常规反向射线跟踪算法,对于较小的源直径与球直径比,收敛速度较慢。描述了一种新开发的算法,该算法可通过对跟踪的光线的漫反射的每个点进行直接源诱发辐射的计算来显着提高收敛性。所开发的方法应用于可见光和红外光谱范围的积分球反射仪。对入射到样品中心的辐射的半球形辐射分布进行了参数研究。计算各种因素导致的样品反射率与实际反射率的偏差。讨论了结果的准确性,反射模型的充分性以及算法实现的其他重要方面。

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    《Applied optics》 |2003年第19期|共11页
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