Automatic stress analyzer

Details Automatic stress analyzer Automatic stress analyzer

1989-08-14

1991-08-27

Willis, Davis L.

Optics: measuring and testing

Material strain analysis

With polarized light

356367, G01B 1118

Patent

active

050429442

ABSTRACT:
A method and apparatus for the automatic analysis of stress in a body. The device includes a measuring head and an apparatus for traversing the measuring head across a photosensitive material attached to the body. The measuring head measures the intensity of light reflected or dispersed from the photosensitive material. The reflected or dispersed light is emitted from and received by diodes in the measuring head. Electrical signals representative of the intensity of light traversing the photosensitive material in three directions are generated for each of a set of points on the photosensitive material. The electrical signals are analyzed by computer and converted to stress and strain data which may then be displayed on a plotter or monitor. The method includes traversing the measuring head across the photosensitive material, detecting the intensity of light dispersed or reflected from the photosensitive material in three directions, analyzing the electrical signals to produce stress and strain data for the photosensitive material at each point, and displaying the resulting stress and strain data.

REFERENCES:
patent: 3645603 (1972-02-01), Smith
patent: 3950987 (1976-04-01), Slezinger et al.
patent: 4123158 (1958-10-01), Reytblatt
patent: 4171908 (1979-10-01), Robert et al.
patent: 4207000 (1980-06-01), Miller
patent: 4474466 (1984-10-01), McDonach et al.
Brochure entitled "Experimental Stress Analysis Technology" by Measurements Group, Inc., North Carolina, U.S.A., 1981.
Brochure entitled "Photostress" by Measurements Group, Inc., North Carolina, U.S.A., 1984.
"Real-Time Observation of In-Plane Displacements of Opaque Surfaces", Wadsworth et al, Optics and Laser Technology, Jun. 1973, pp. 119-123.

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