Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/153983
Title: THE DEVELOPMENT OF A DIGITAL IN-LINE HOLOGRAPHY SYSTEM FOR THE APPLICATION IN HOLOGRAPHIC PARTICLE IMAGE VELOCIMETRY
Authors: LIU XIAOGANG
Keywords: Digital Holography
Holographic Particle Image Velocimetry
Camera
Hologram Reconstruction
Issue Date: 2009
Citation: LIU XIAOGANG (2009). THE DEVELOPMENT OF A DIGITAL IN-LINE HOLOGRAPHY SYSTEM FOR THE APPLICATION IN HOLOGRAPHIC PARTICLE IMAGE VELOCIMETRY. ScholarBank@NUS Repository.
Abstract: Holographic Particle Image Velocimetry (HPIV) is one of the techniques used in studying the fluid flow speed, by tracking the motions of seeded particles in the fluid. Integrated with digital holography, HPIV allows the recording of particles™ 3D coordinate information onto a 2D image (hologram). By reconstructing these particles™ 3D locations from their holograms taken at consecutive time, we are able to derive their velocities and thus calculate the flow speed assuming these particles faithfully follow the flow dynamics. The aim of this project is to construct a digital inline holography system as a primitive model for underwater HPIV application. During this project, a high resolution digital camera system with Kodak™s image sensor KAI-11002 is developed; relevant camera files and control software are created with LabVIEW; the laser optics for digital inline holography is also set up. With these hardware setups, digital holograms are successfully captured. Software algorithms to reconstruct holograms and locate particles in a 3D space are also investigated. The convolution method is selected for hologram reconstruction. Furthermore, an algorithm based on the minimum intensity detection is used to focus particle coordinates in the 3D space. Based on experiment results, future work to further improve this algorithm is identified.
URI: https://scholarbank.nus.edu.sg/handle/10635/153983
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