Assessment of some experimental and image analysis factors for background-oriented schlieren measurements.
Assessment of some experimental and image analysis factors for background-oriented schlieren measurements.
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评估背景导向纹影测量的一些实验和图像分析因素。
DOI：
10.1364/ao.51.007554
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发表时间：
2012
期刊：
影响因子：
1.9
通讯作者：
S. Obayashi
中科院分区：
文献类型：
--
作者：
A. Gojani;S. Obayashi
背景定向纹影技术可以实现流体流动特性的定量测量。在本文中，它表明，这取决于几个因素。图像质量指数用于研究图像传感器及其输出质量的影响。图像评价应用于合成图像，其用阶跃函数处理，使得它们模拟急剧的密度跳跃。评估的矢量偏移的逐渐变化揭示了对询问窗口的主要依赖，并且揭示了对背景特征的较少依赖。BOS应用于激波管中楔形体的激波反射，由于存在较大的不确定性，给出了定性的结果。但是，自然对流冷却的应用得到了令人满意的结果，与热电偶数据和理论相媲美。
Quantitative measurements of fluid flow properties can be achieved by background-oriented schlieren (BOS). In this paper, it is shown that this depends on several factors. Image-quality index is used to investigate the influence of the image sensor and the quality of its output. Image evaluation is applied to synthetic images, which are treated with a step function, so that they simulate the sharp density jump. The gradual change of the evaluated vector shift revealed the major dependence on the interrogation window, and revealed less of a dependence on background features. BOS applied to shock-wave reflection from a wedge in a shock tube gave qualitative results, due to large uncertainties. But, the application to cooling by natural convection gave satisfactory results, comparable to thermocouple data and theory.