X-ray 미세 영상기법을 이용한 미세기포의 크기 및 속도 동시 측정기술 개발 = X-ray Micro-Imaging Technique for Simultaneous Measurement of Size and Velocity of Micro-Bubbles

다국어 초록 (Multilingual Abstract)

It is important to measure precisely the size and velocity of micro-bubbles used in various field. The synchrotron X-ray micro-imaging technique was employed to measure the size and velocity of micro-bubbles moving in an opaque tube simultaneously. Phase contrast images were obtained at interfaces of micro-bubbles between water and air due to their different refractive indices. The X-ray micro-imaging technique was found to measure an optical fiber with an accuracy of 0.2%. Micro-bubbles of 20∼60$\mu\textrm{m}$ diameter moving upward in an opaque tube (${\Phi}$＝2.7mm) were tested to measure bubble size and up-rising velocity. For DI water, the measured velocity of micro-bubbles is nearly proportional to the square of bubble size, agreed well with the theoretical result. In addition, the synchrotron X-ray micro-imaging technique can measure accurately the size and velocity of several overlapped micro-bubbles.

참고문헌 (Reference)

1 "Three-Dimensional Measurements of Single Bubble Dynamics in a Small Diameter Pipe Using Stereoscopic Particle Image Velocimetry" 27 : 817-842, 2001

2 "Shape Detection in Computer Vision Using the Hough Transform" Springer, London. 1992

3 "Optimal Edge-Based Shape Detection" Macquarie University, Sydney. 1999

4 "Novel Interferometric Measurement of Size and Velocity Distributions of Spherical Particles in Fluid Flows" 11 : L13-L18, 2000

5 "New Technical Improvements for TRUS in the Diagnosis of Prostate Cancer" 1 : 8-14, 2002

6 "Measurements of a Rising Single Bubble in Stagnant Liquid" 6 : 129-137, 1999

7 "Investigation of the Unsteady Two-phase Flow with Small Bubbles in a Model Bubble Column Using Phase-Doppler Anemometry" 57 : 5143-5159, 1961

8 "Interactions Between Microbubbles and Ultrasound: In Vitro and In Vivo Observations" 29 (29): 1071-1088, 1997

9 "Coherence-Enhanced Synchrotron Radiology: Simple Theory and Practical Application" 35 : R105-R120, 2002

10 "Calibration of Malvern Particle Sizer" 23 : 2415-2419, 1984

11 "Bubbles, Drops, and Particles" Academic, NewYork. 1978

12 "A New Two-Frame Particle Tracking Algorithm Using Match Probability" 22(1) : 23-32, 1996