Method and apparatus for evaluating structural weakness in polym

Details Method and apparatus for evaluating structural weakness in polym Method and apparatus for evaluating structural weakness in polym

1994-05-26

1996-01-09

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With sample excitation

356417, 2504581, G01N 2164, G01N 2188

Patent

active

054833388

ABSTRACT:
A method and apparatus for evaluating structural weaknesses in polymer matrix composites is described. An object to be studied is illuminated with laser radiation and fluorescence emanating therefrom is collected and filtered. The fluorescence is then imaged and the image is studied to determine fluorescence intensity over the surface of the object being studied and the wavelength of maximum fluorescent intensity. Such images provide a map of the structural integrity of the part being studied and weaknesses, particularly weaknesses created by exposure of the object to heat, are readily visible in the image.

REFERENCES:
C. J. Janke et al, "Composite Heat Damage Spectroscopic Analysis," ORNL/ATD-42, Sep. 1990.
G. L. Powell et al, "Nondestructive Inspection of Graphite-Epoxy Laminates for Heat Damage Using DRIFT and LPF Spectroscopies," Y/DZ-1008/R1 (Preprint), Jun. 3, 1993.

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