基于快速傅里叶变换的微米级粒子图像测速

R. Balamurugan, B. Jeeva
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引用次数: 2

摘要

本文介绍了一种非侵入式、独特的聚苯乙烯颗粒球图像测速光学测量技术。种子粒子的流动由激光照射,并在指定的时间间隔内捕获双帧单曝光图像。采用快速傅里叶变换方法对图像进行分域分割,评估图像的相互关系。从捕获的图像中计算粒子位移,然后估计出微米尺寸的粒子在平面上的速度大小。该技术最适用于高浓度的种子颗粒。激光散斑测速在估计流体速度时具有脉冲分离时间范围宽、噪声降低、无方向模糊等优点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Micron size particle image velocimetry by fast Fourier transform
In this paper, a non-intrusive, unique optical measurement technique of seeding polystyrene granular beads image velocimetry has been described. The flows of seeded particles are illuminated by laser light and double frame-single exposure images are captured at a specified interval of time. Images are segmented into sub interrogation domain and cross correlation of images are evaluated by Fast Fourier Transform method. From the captured images, particle displacement is calculated and then magnitude of the velocity of micron size seeds in the plane is estimated. This technique is most suitable for high density concentration of seeded particles. Laser speckle velocimetry has wide range of pulse separation time and reduction of noise in the estimation of fluid velocity without directional ambiguity.
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