Prof. Dr. –Ing Hui-He QIU (LSTM Erlangen-Nuremberg, Germany)

Department of Mechanical Engineering

The Hong Kong University of Science & Technology

Clear Water Bay, Kowloon, Hong Kong

Email address: meqiu@ust.hk

Phone: (852) 2358 7190

Fax: (852) 2358 1543

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Research Area (研究领域):

1. Micro Resolution Particle Image Velocimetry in Multiphase Flows

Figure 1: Scattering of Microbubbles in a Microchannel

Figure 2: PIV Images with Background Noise

Figure 3: Miscalculation of Velocity Field

Figure 4: Transformation using Laplacian of Gaussian

Formulations

Assuming the double exposed images are

F1(x, y) and F2(x, y)

Let’s introduce following pre-processing scheme using Laplacian of Gaussian (LoG):

where

Therefore,

where

Figure 5: After LoG Processing

Figure 6: Velocity Field after LoG Processing

Figure 7: Experimental Validation

Figure 8: Flows with Background Noise Addition

Figure 9: Calculated Velocity Vector Field