유체기계공업학회:학술대회논문집
- 유체기계공업학회 2006년 제4회 한국유체공학학술대회 논문집
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- Pages.517-518
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- 2006
개발된 적분법을 포함하는 디지털 스펙클 토모그래피 기법을 이용한 비정상 비대칭 유동 분석
Analysis of Unsteady and Asymmetric Flows Using Digital Speckle Tomography with Developed Integration Method
- 발행 : 2006.08.23
초록
Transient and asymmetric density distributions have been investigated by three-dimensional digital speckle tomography with a novel integration method. Multiple CCD images captured movements of speckles in three angles of view simultaneously because the flows were asymmetric and unsteady. The speckle movements which have been formed by a ground glass between no flow and downward butane flow from a circular half opening have been calculated by a cross-correlation tracking method so that those distances can be transferred to deflection angles of laser rays for density gradients. A novel integration method has been developed to obtain projection data from the deflection angles for the speckle tomography.'The three-dimensional density fields have been reconstructed from the accurate projection values by a real-time multiplicative algebraic reconstruction technique (MART) with the developed integration method.