Method and system for characterizing structural damage from...

Optics: measuring and testing – Shape or surface configuration – Triangulation

Reexamination Certificate

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C356S237100

Reexamination Certificate

active

11088787

ABSTRACT:
This process includes arranging a grid on the surface a structure to be inspected, directing a light source onto this grid so as to create a shadow on the structure, recording an image of the pattern observed, displaying a graphic representation of the image recorded, and determining a depth of the damage from this representation. The device enabling the implementation of the process includes a grid or screen, a light sources, an image acquisition device, and a display. Once the images are recorded, the invention calls upon processing devices that permit determining the position in space, in particular, a height, of each point of the image and as such of the surface observed.

REFERENCES:
patent: 5025285 (1991-06-01), Schwarz
patent: 5311286 (1994-05-01), Pike
patent: 6731391 (2004-05-01), Kao et al.
patent: 6809803 (2004-10-01), O'Brien et al.
patent: 0 674 151 (1995-09-01), None
patent: WO 00/39523 (2000-07-01), None
Juan Antonio Quiroga, et al., “Isotropic n-dimensional fringe pattern normalization”, Optics Communications vol. 224, Sep. 2003, pp. 221-227.
Manuel Servin, et al., “Isochromatics demodulation from a single image using the regularized phase tracking technique”, Journal of Modern Optics, vol. 48, No. 3, 2001, pp. 521-531.
Bernhard Ströbel, et al., “Processing of interferometric phase maps as complexed-valued phasor images”, Applied Optics, vol. 35, No. 13, May 1, 1996, pp. 2192-2198.
Manuel Servin, et al., “Regularized Quadrature and Phase Tracking (RQPT) From a Single Closed-Fringe Interferogram”, (CC/CIMAT), No. I-03-13, May 8, 2003, pp. 1-23.
J. C. Martinez-Anton, et al., “Enhancement of surface inspection by Moire interferometry using flexible reference gratings”, Optics Express, vol. 8, No. 12, Jun. 4, 2001, pp. 649-654.
J. C. Martinez-Anton, et al., “Shadow moiéand the use of flexible gratings to adapt to curved surfaces”, Roma 2000, 4 pages.

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