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1 December 1991 Displacement analysis of the interior walls of a pipe using panoramic holointerferometry
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Standard phase-displacement equations, used for both double exposure and real time holo-interferometry, are combined with the geometrical mapping and optical characteristics of panoramic annular lenses to accurately measure surface displacement on the interior wall of a pipe. In this approach, one panoramic annular lens is used to illuminate the surface with coherent light, and the resulting intensity distribution is holographically recorded through a second panoramic annular lens. Interference fringes are obtained in real-time by comparing holograms recorded before and after the pipe is displaced. The annular images and the holographic fringes are acquired and stored digitally in a computer system. Image transformation algorithms are applied to remove optical distortions in the holographic pattern and fringe loci are compared to those predicted on the basis of theory.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John A. Gilbert, Donald R. Matthys, and Christelle M. Lindner "Displacement analysis of the interior walls of a pipe using panoramic holointerferometry", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991);

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