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김형범(Hyoung-Bum kim),Jean Hertzberg,Robin Shandas 한국가시화정보학회 2005 한국가시화정보학회지 Vol.3 No.1
The combination of ultrasound echo images with digital particle image velocimetry (DPIV) method has resulted in a two-dimensional, two-component velocity field measurement technique appropriate for opaque flow conditions including blood flow in clinical applications. Advanced PIV processing algorithms including an iterative scheme and window offsetting were used to increase spatial resolution. The optimum concentration of the ultrasound contrast agent used for seeding was explored. Velocity validation tests in fully developed laminar pipe flow and pulsatile flow showed good agreement with both optical PIV measurements and the known analytic solution. These studies indicate that echo PIV is a promising technique for the non-invasive measurement of velocity profiles and shear stress.
kim Hyoung-Bum,Hertzberg Jean,Shandas Robin 한국가시화정보학회 2005 한국가시화정보학회지 Vol.3 No.1
The combination of ultrasound echo images with digital particle image velocimetry (DPIV) method has resulted in a two-dimensional, two-component velocity field measurement technique appropriate for opaque flow conditions including blood flow in clinical applications. Advanced PIV processing algorithms including an iterative scheme and window of offsetting were used to increase spatial resolution. The optimum concentration of the ultrasound contrast agent used for seeding was explored. Velocity validation tests in fully developed laminar pipe flow and pulsatile flow showed good agreement with both optical PIV measurements and the known analytic solution. These studies indicate that echo PIV is a promising technique for the non-invasive measurement of velocity profiles and shear stress.
김형범(Hyoung-Bum Kim),정인영(In-Young Jeong),오재근(Jae-Geun Oh),이상혁(Sang-Hyuk Lee),Jean Hertzberg 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
PIV(Particle image velocimetry) presents the flow velocity of whole flow fields in a fraction of a second. It is a unique method to capture the flow structure in complex flow and measure the turbulent properties with good accuracy by the development of digital image processing and optics. Conventional PIV method uses two optical axis configuration during the image grabbing process. That is, the illumination plane and the recording plane must be parallel. This configuration is very natural to grab the whole field without the image distortion. In the real problem, it is often to meet the situation which this configuration is hard to be fulfilled. In this study, we developed new PIV method which only uses single optical axis to grab the particle images. This new PIV method become possible by utilizing the scanning method similar to echo PIV technique. One particle image of scanning PIV consists of scanned several line images and by repeating this scanning process, two particle images ere grabbed and processed to produce the velocity vectors.