Shearing optical element for interferometric analysis system

Details Shearing optical element for interferometric analysis system Shearing optical element for interferometric analysis system

1993-06-29

1994-08-23

Turner, Samuel A.

Optics: measuring and testing

Material strain analysis

By light interference detector

356353, G01B 902

Patent

active

053412044

ABSTRACT:
Method and apparatus for analyzing the deformation of an object resulting from the application of stress. A novel optical element is used to perform shearometric analysis upon a test object. The novel optical element has an overall pattern of first and second pluralities of regions having significantly different indices of transmissivity. The pattern of variations causes pairs of light rays which are reflected from two distinct points on the test object at a divergent angle to emerge from the optical element so that they are nearly parallel. The nearly parallel rays are then received upon a photoelectrical sensing means such as a video camera or photoelectric array. Because the rays impinging thereon are nearly parallel, they may be adequately resolved by the photoelectric sensing means, thus enabling shearometric analysis to be performed electronically in a rapid and cost-effective manner.

REFERENCES:
patent: 4690552 (1987-09-01), Grant et al.
patent: 4887899 (1989-12-01), Hung

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