论文标题
通过隐藏的网格背景的定量流动可视化
Quantitative flow visualization by hidden grid background oriented schlieren
论文作者
论文摘要
本文引入了隐藏的网格背景定向的Schlieren，用于定量研究和自然对流传热的可视化。在此技术中，由温度梯度引起的折射率变化通过背景模式的变形在记录的信号相中编码。背景（未发生的）模式在光源中是隐式（或隐藏的）。相位图的定量估计是通过窗口傅立叶变换获得的。该方法使用关节空间频率表示对信号进行局部处理。实际上，通过研究自然流动流，这是一个苛刻的任务，由于其相对较小的传热，实际上证明了隐藏网格背景的性能。
The paper introduces hidden grid background oriented schlieren for quantitative study and visualization of natural convection heat transfer. In this technique, the refractive index variation, induced by the temperature gradient, is encoded in the recorded signal phase through the distortion of a background pattern. The background (undistorted) pattern is implicit (or hidden) in the light source. Quantitative estimation of the phase map is obtained by windowed Fourier transform. This method offers localized processing of the signal using joint space-frequency representation. The performance of hidden grid background oriented schlieren is practically demonstrated by investigating natural convective flow, a demanding task due to its comparatively small heat transfer.
