Schlieren photography is a process for photographing fluid flow. Invented by the German physicist August Toepler in 1864 to study supersonic motion, it is widely used in aeronautical engineering to photograph the flow of air around objects.

Schlieren imaging is a method to visualize density variations in transparent media. [1] The term "schlieren imaging" is commonly used as a synonym for schlieren photography, though this article particularly treats visualization of the pressure field produced by ultrasonic transducers, generally in water or tissue-mimicking media.

纹影技术（Schlieren）是一种用于可视化透明介质中密度变化的光学方法，广泛应用于流体力学、空气动力学和热力学等领域。 通过捕捉介质中折射率梯度引起的光线偏转，纹影技术使得不可见的流动现象得以呈现。

这些阴影是表征流动的扩展和压缩两种状态的 光强度 表示； 主要参考Wikipeida： https://en.wikipedia.org/wiki/Schlieren发明背景透明介质的光学不均匀性不一定能够被肉眼察觉，纹影物理学的发展最初是为了开发出均匀的高质量透镜；技术背景光学不均匀性使得局部的光路 …

2021年5月13日 · This page describes an older flow visualization technique called schlieren photography. Schlieren photography is similar to the shadowgraph technique and relies on the the fact that light rays are bent whenever they encounter changes in density of a fluid. Schlieren systems are used to visualize the flow away from the surface of an object.

2023年7月10日 · This schlieren image of shock waves created by a T-38C in supersonic flight was captured using the sun’s edge as...

Schlieren imaging systems provide a powerful technique to visualize changes or nonuniformities in refractive index of air or other transparent media. For over two centuries, schlieren systems were typically implemented for a wide variety of non-intrusive real-time fluid dynamics studies.

English: In physics, schlieren are regions of a fluid having different refractive index because of their different density. Schlieren imaging are fluid flow visualization techniques to record images of these area.

In this experiment you will assemble and align a schlieren/shadowgraph setup from components in the Cann Laboratory and use it to visualize phenomena in uids and solids using a high-speed camera. Upon completion of this experiment, you should:

2018年5月10日 · In this paper, an overview on the use of the schlieren imaging technique for atmospheric pressure plasma characterization is presented. In the first part, the physical principles behind this technique and the different setups that …