Analysis of Density Distribution for Butane Using Three-dimentional and Real-time Digital Speckle Tomography

3차원 실시간 디지털 스페클 토모그래피를 이용한 부탄 밀도 분포 분석

Transient and asymmetric density distributions have been investigated by digital speckle tomography. Multiple CCD images captured movements of speckles in three angles of view simultaneously because the flows were asymmetric and transient. The speckle movements 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 tranferred to deflection angles of laser rays for density gradients. The three-dimensional density fields have been reconstructed from the fringe shift by a real-time multiplicative algebraic reconstruction technique (MART).