A Novel Compact Fourier Integral Microscope Design for Wall Shear Stress Measurements

This thesis presents a novel design of a compact Fourier Integral Microscope (FIMic)aimed at resolving near wall velocity profiles in measurements on a 6:1 prolate spheroid at a nominal Reynolds number of 12 × 106. The primary objective here discussed is towards developing an advanced imaging system capable of capturing detailed flow dy- namics at high temporal resolutions using a newly developed photobleaching molecular tagging velocimetry (MTV) technique. The FIMic system integrates a microlens array (MLA) directly into an infinity-corrected microscope objective aperture stop, sampling the Fourier plane of the host system. Images captured by the device are used to fully define a 4D Lightfield function that allows for full 3D reconstructions of an imaged volume. The system design, theory, and performance are discussed in detail. The final design achieves 7 perspective views, a magnification of 3.42, a field of view of 1.41mm, a depth of field of 128μm, and a lateral resolution of 5.54μm. Various challenges in system stability, calibration, and light delivery are addressed to optimize performance. The results demonstrate significant advancements in a compact FIMic design, bringing it closer to practical in-situ applications for fluid dynamic studies.

Author

• Williams, Steven Ward

Language

• English

Keyword

• Plenoptic
• FIMic
• Wall Shear Stress
• MTV
• PTV
• Fourier Integral Microscope

Date created

• 2024

Type of Work

• Master's Thesis

License

• All rights reserved

Rights statement

• In Copyright

GW Unit

• Mechanical & Aerospace Engineering

Degree

• M.S.

Advisor

• Bardet, Philippe

Committee Member(s)

• Punzi, Sarah
• Bardet, Philippe
• Rau, Matthew

Persistent URL

•  https://scholarspace.library.gwu.edu/etd/mc87pr17b