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Spatially resolved, single-ended two-dimensional visualization of gas flow phenomena using structured illumination

机译：使用结构化照明对气流现象进行空间分辨的单端二维可视化

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摘要

A method for 3D mapping of scattering particle concentration in a gaseous medium based on the backscattered light in a single direction has been demonstrated. The technique is originally developed for microscopy but now implemented on larger-scale samples. The technique used is known as structured illumination, where a sinusoidal grid pattern is projected onto the medium, thus marking the in-focus plane. This makes it possible to discriminate against light originating from the out-of-focus parts of the sample, which usually makes it difficult to detect inner structures of the medium. In this study a flow of nitrogen was introduced into a flow of water droplets, with the aim to optically select only the plane where nitrogen was present. The results indicate that the technique could be used to study, e.g., combustion devices with limited optical access.
机译：已经证明了一种用于基于单个方向上的反向散射光对气体介质中的散射粒子浓度进行3D映射的方法。该技术最初是为显微镜开发的，但现在已在较大规​​模的样品上实现。所使用的技术称为结构照明，其中将正弦网格图案投影到介质上，从而标记对焦平面。这使得可以区分源自样品的散焦部分的光，这通常使得难以检测介质的内部结构。在这项研究中，将氮气流引入水滴流，目的是仅光学选择存在氮气的平面。结果表明该技术可用于研究例如光学访问受限的燃烧装置。

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