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Advanced Stereo High-Speed Imaging Techniques in Fluid Mechanics

This course on Measurements in Fluid Mechanics explores advanced stereo high-speed imaging techniques using high-resolution CMOS sensors. It covers the optical configurations for capturing wing motions, including experimental setups that synchronize sound and motion. Key aspects include data reduction equations, image processing, and the reconstruction of 3D views of wing surfaces. Students will learn to apply these methods to biological models, specifically focusing on fire ants, to better understand dynamic fluid interactions.

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Advanced Stereo High-Speed Imaging Techniques in Fluid Mechanics

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  1. Measurements in Fluid Mechanics058:180 (ME:5180)Time & Location: 2:30P - 3:20P MWF 3315 SCOffice Hours: 4:00P – 5:00P MWF 223B-5 HL Instructor: LichuanGui lichuan-gui@uiowa.edu Phone: 319-384-0594 (Lab), 319-400-5985 (Cell) http://lcgui.net

  2. Lecture 38. Stereo high-speed imaging

  3. Stereo High-speed Imaging - High-speed camera Gray value resolution 10-bit CMOS sensor 17.5µm pixels Frame rate & digital resolution 10241024 @ 2000 fps 1024256 @ 8000 fps

  4. Stereo High-speed Imaging - Optical configuration outside the camera Mirror image Mirror Lens Front view Alate Side view Mirror Mirror image

  5. Lens adaptor Block Image sensor (1024256) Slit apertures Mirrors Stereo High-speed Imaging - Optical configuration inside the camera Lens Mirror images

  6. High-speed camera Mirrors Back lighting Tethered fire ant alate Microphones Stereo High-speed Imaging - Experimental setup with sound recording

  7. Stereo High-speed Imaging - Experimental setup with sound recording Sound recorded from bottom & rear with MCDL

  8. Raw image Background Processed Stereo High-speed Imaging - Sample image & postprocessing

  9. Stereo High-speed Imaging - Synchronize motion w. sound in one period 70 frames in the period of 8.8 ms (114Hz), bar chart represents sound pressure

  10. Stereo High-speed Imaging - Improved system for wing motion reconstruction • New optic table and magnetic holders for higher precision • New template for adjusting mirror angles to ensure 90o • difference between front and side- views - Tested ant body carefully oriented

  11. O: root of the wing T: tip of the wing 3: the 3rd point at the wing surface Stereo High-speed Imaging - Position & orientation of the wing • the wing assumed to be a planar surface without thickness

  12. Stereo High-speed Imaging - Wing root position More frames may be necessary for higher accuracy & reliability

  13. Axis's Axis of the wing: OT Axis of ant body: OZ Planes Pink: wing surface Angles Yellow: OT & OZ xy: wing angle in xy-plane zy: wing angle in yz-plane : angle between wing surface & plane through OT & OZ Stereo High-speed Imaging - 3D view of the wing surface

  14. Wing surface function: OT&OZ surface function: Wing rotation angle: Stereo High-speed Imaging - Data reduction equations

  15. Stereo High-speed Imaging - Example I: BIFA male test on July 8, 2006 Body weight: 5.5 mg Body length: 6 mm Image size: 590190 pixels, digital resolution: 22.35 pixel/mm

  16. Stereo High-speed Imaging - Wing tip position of the BIFA male

  17. 17 Stereo High-speed Imaging - Wing angles of the BIFA male

  18. Stereo High-speed Imaging - High resolution picture of the forewing Image size: 850×300 pixels Digital resolution: 128 pixel/mm O T

  19. H L Stereo High-speed Imaging - High resolution picture of the hindwing Image size: 850×300 pixels Digital resolution: 128 pixel/mm O T Gray value distribution: G(L,H)

  20. Front view image: gf(x,y)=G(L,H) H Side view image: (x,y,z) gs(z,y)=G(L,H) L Top view image: gt(x,z)=G(L,H) Stereo High-speed Imaging - Simulating images form three view angles

  21. Stereo High-speed Imaging - Original (top) and simulated (bottom) images

  22. Stereo High-speed Imaging - Reconstructed 3D view of the male

  23. 23 Stereo High-speed Imaging - Overlapped image of 74 frames

  24. Stereo High-speed Imaging • Reference •  Gui L, Fink T, Cao Z, Sun D, Seiner JM and Streett DA (2010) Fire ant alate wingmotion data and numerical reconstruction. Journal of Insect Science 10:9,available online: http://insectscience.org/10.19

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