Optical method and apparatus for strain analysis

Details Optical method and apparatus for strain analysis Optical method and apparatus for strain analysis

1985-08-19

1987-09-01

Willis, Davis L.

Optics: measuring and testing

Material strain analysis

By light interference detector

356353, 356354, G01B 902, G01B 1116

Patent

active

046905529

ABSTRACT:
A method and apparatus for measuring strains in a test object in any of a plurality of directions. The object is illuminated with coherent light so that light is reflected to a focussing lens and a shearing diffraction grating having lines extending in a plurality of directions. The various diffracted orders interfere at the focal plane of the lens and are recorded on a photographic media. The object is then stressed and a second exposure is made on the same media, resulting in interference between the fringes produced on the two exposures. The media is developed as a transparency and subjected to optical processing to detect strain in any direction.

REFERENCES:
Hariharan et al., "Double Grating Interferometer . . . ", Optics Communications, vol. 11, No. 3, pp. 317-320, 7/74.
Hariharan, "Speckle-Shearing Interferometry . . . ", Applied Optics, vol. 14, No. 11, p. 2563, 11/75.
Koliopoulos, "Radial Grating Lateral Shear . . . ", Applied Optics, vol. 19, No. 9, pp. 1523-1528, 5/80.
Hung, "Shearography: A New Optical Method . . . ", Optical Engineering, vol. 21, No. 3, pp. 391-395, 6/82.

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