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Effect of Particle Concentration on Digital Holographic PTV Measurement

입자 농도가 Digital Holographic PTV 측정에 미치는 영향에 관한 연구

  • 김석 (포항공과대학교 기계공학과) ;
  • 이상준 (포항공과대학교 기계공학과)
  • Published : 2006.10.01

Abstract

The digital HPTV(holographic particle tracking velocimetry) velocity field measurement system consists of four steps: recording, numerical reconstruction, particle extraction and velocity extraction. In the velocity extraction process, we improved the two frame PTV algorithm to extract 3-D displacement information of each particle located in 3D space. Because a digital CCD camera was used, some factors such as spatial resolution, numerical aperture, and particle concentration influenced on the performance of the developed digital HPTV. Especially, the particle concentration $(C_o)$ affected the reconstruction efficiency and recovery ratio in the numerical reconstruction and particle extraction procedure. In this paper, the effect of particle concentration reconstruction efficiency and recovery ratio were analyzed experimentally. Optimal particle concentration was found to be in the range of $C_o=11{\sim}17\;particles/mm^3$.

Keywords

References

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