Swiss Federal Institute of Technology (EPFL), Institute of Chemical Sciences and Engineering, Lausanne, Switzerland.
J Biomed Opt. 2017 Mar 1;22(3):35004. doi: 10.1117/1.JBO.22.3.035004.
A one-axis charge-coupled device camera-based goniometer setup was developed to measure the three-dimensional radiance profile (longitudinal, azimuthal, and polar) of cylindrical light diffusers in air and water. An algorithm was programmed to project the two-dimensional camera data onto the diffuser coordinates. The optical system was designed to achieve a spatial resolution on the diffuser surface in the submillimeter range. The detection threshold of the detector was well below the values of measured radiance. The radiance profiles of an exemplary cylindrical diffuser measured in air showed local deviations in radiance below 10% for wavelengths at 635 and 671 nm. At 808 nm, deviations in radiance became larger, up to 45%, most probable due to the manufacturing process of the diffuser. Radiance profiles measured in water were less Lambertian than in air due to the refractive index matching privileging the radial decoupling of photons from the optical fiber.
一种基于单轴电荷耦合器件相机的测角仪装置被开发出来，用于测量空气和水中圆柱形漫射器的三维辐射分布（纵向、水平和极向）。编写了一个算法将二维相机数据投影到漫射器坐标上。该光学系统的设计目的是在漫射器表面上实现亚毫米级的空间分辨率。探测器的检测阈值远低于测量辐射值。在空气中测量的一个示例圆柱形漫射器的辐射分布显示，在 635nm 和 671nm 波长下，辐射的局部偏差低于 10%。在 808nm 时，辐射的偏差变得更大，高达 45%，最有可能是由于漫射器的制造工艺。由于折射率匹配，光纤中的光子径向解耦，水中的漫射器辐射分布比空气中的更非朗伯。
