Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1993-02-01
1995-04-25
Limanek, Robert P.
Optics: measuring and testing
By particle light scattering
With photocell detection
356 355, G01B 9021, G01L 124
Patent
active
054104068
ABSTRACT:
A semi-monocoque structure is nondestructively tested by affixing an exciter to the outer skin of the structure for causing it to vibrate with an out-of-plane motion in a nodal pattern. Sensors either attached to or spaced from the outer surface provide signals representative of phase and acceleration information at likely anti-nodal points from which a computer-programmed controller senses resonant frequencies and amplitude of displacement. The controller automatically scans the excitation frequency through a predetermined range, and upon sensing a resonant frequency examines the signal to ascertain phase and amplitude of displacement of the anti-nodes and automatically adjusts their amplitude of displacement until the anti-nodes are optimized to be either bi-concave or concave/convex. When it has sensed optimum conditions, the controller twice triggers the Pockels cell of a double-pulse holographic camera at times of maximum plus and maximum minus displacement, respectively, whereby the resulting overlaid holograms are synchronized to points of maximum displacement of the anti-nodal pattern. It is from the fringe map of resulting interference patterns contouring the anti-nodal patterns that faults are interpreted.
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Hardy David B.
Holographics Inc.
Limanek Robert P.
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