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Assessing the diffusing constant of a microparticle using digital holagraphic imaging with plane wavefronts
Umeå University, Faculty of Science and Technology, Department of Physics.
2018 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

In this work, we designed a simple digital holographic imaging system to access the diffusion constants of micro-particles, we used the holograms to get three-dimension position information based on Fresnel-Kirchhoff diffraction formula. Meanwhile, we used the angular spectrum method for numerical reconstruction. Based on the reconstruction images, we measured diffusion constants in x, y, and z direction and got 4.420*10-13 m2/s, 4.830*10-13 m2/s, 3.801*10-13 m2/s with error 2.77%, 6.24% and 16.4% respectively. The error in z axis can be caused by the misalignment among sample stage, laser beam and camera detector, which induced that the shape of hologram and the conversion factor on the pixel size were shifted. Moreover, the algorithm for background subtraction and camera resolution could be improved to get higher hologram quality, which would highly increase the accuracy of measurement.

Place, publisher, year, edition, pages
2018.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-150051OAI: oai:DiVA.org:umu-150051DiVA, id: diva2:1230794
Subject / course
Fysik C - Examensarbete
Available from: 2018-07-04 Created: 2018-07-04 Last updated: 2018-07-04Bibliographically approved

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