Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1989-05-10
1991-01-01
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With light attenuation
356 32, G01B 1124
Patent
active
049813609
ABSTRACT:
Photographic mapping of structural surfaces is accomplished by a projection Moire method. Deformations of the structure surface being investigated are zeroed out when under no load. This is accomplished by projecting a master grille pattern onto a test surface. The reflection then exposes a photographic plate. After the photographic plate is developed, it is repositioned in its original position and the distorted image thereon is projected back to the structure surface being investigated. It is then viewed from behind the master grille. By reprojecting the distorted image against the structure surface, the distortions on the photographic plate become reversed so that they appear at the recording station in coincidence with the master grille. Thus, any minor deformations of the structure surface produce no fringes at an observation point. As loading of the structure proceeds, the fringes will develop in proportion to buckling of the structure.
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Evans F. L.
Grumman Aerospace Corporation
Hantis K. P.
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