Computerized method of determining surface strain distributions

Details Computerized method of determining surface strain distributions Computerized method of determining surface strain distributions

1989-02-27

1990-11-06

Lall, Parshotam S.

Boots, shoes, and leggings

364559, 382 8, G06K 900

Patent

active

049691066

ABSTRACT:
A method and apparatus for measuring strain distribution on a deformed surface utilizes a video or photographic camera for taking two images of the surface which are taken at an angle to each other. The surface carries a deformed grid which has grid points that are digitized using images from the camera. The digitized points each form one set of two-dimensional coordinates. Each point of the one set of coordinates is correlated with a corresponding point of the other set. The two sets of two-dimensional coordinates are then used in conjunction with the geometrical relationship between the images to calculate a single set of three-dimensional coordinates for the grid points. The three-dimensional coordinates are then used in groups of three adjacent points to calculate strain over the surface.

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GM-Balance Engineering Brochure on Portable Grid Circle Analyzer (date unknown).
MTS-The Optical Grid Analyzer Model 637 (date unknow).

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