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Proceedings Article

Unified system for holographic measurement in fluid and solid mechanics: use of the system for 3D velocity measurement in fluids through a thick curved window

[+] Author Affiliations
Victor S. S. Chan, Donald H. Barnhart, Neil A. Halliwell, Jeremy M. Coupland

Loughborough Univ. (United Kingdom)

Proc. SPIE 3783, Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids, 14 (October 13, 1999); doi:10.1117/12.365736
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From Conference Volume 3783

  • Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids
  • Soyoung S. Cha; Peter J. Bryanston-Cross; Carolyn R. Mercer
  • Denver, CO, USA | July 18, 1999

abstract

A new holographic technique has been developed to measure displacement in solid and fluid mechanics. The method uses double exposure holograms of large numerical aperture to record the light scattered from a solid surface or seeding particles that are assumed to follow the fluid motion. Analysis of the resulting hologram is performed in a piece- wise fashion through spatial correlation of the field that passes through a sampling aperture placed in the real image. In this way it is possible to map 3D displacement of an irregular surface or map the movement of seeding throughout an extended volume of fluid. This paper discusses the cancellation of gross aberrations using a phase conjugate holographic optical element to generate a converging reference wave. Seeded flow or solid surfaces recorded with this reference wave geometry can be reconstructed efficiently using a fiber-optic probe. In addition to aberration cancelling the technique allows a method of image shifting to be introduced thus resolving the direction of the flow or surface displacement.

© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Victor S. S. Chan ; Donald H. Barnhart ; Neil A. Halliwell and Jeremy M. Coupland
"Unified system for holographic measurement in fluid and solid mechanics: use of the system for 3D velocity measurement in fluids through a thick curved window", Proc. SPIE 3783, Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids, 14 (October 13, 1999); doi:10.1117/12.365736; http://dx.doi.org/10.1117/12.365736


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