Method and apparatus for measuring strain using a...

Details Method and apparatus for measuring strain using a... Method and apparatus for measuring strain using a...

2005-09-13

2005-09-13

Rosenberger, Richard A. (Department: 2877)

Optics: measuring and testing

Material strain analysis

With polarized light

C073S800000

Reexamination Certificate

active

06943869

ABSTRACT:
A method and apparatus for measuring strain on a surface of a substrate utilizes a substrate surface coated with at least one coating layer. The coating layer provides both luminescence and photoelasticity. The coating layer is illuminated with excitation light, wherein longer wavelength light is emitted having a polarization dependent upon stress or strain in the coating. At least one characteristic of the emitted light is measured, and strain (if present) on the substrate is determined from the measured characteristic.

REFERENCES:
patent: 5817945 (1998-10-01), Morris et al.
patent: 6055053 (2000-04-01), Lesniak
patent: 6122042 (2000-09-01), Wunderman et al.
patent: 6219139 (2001-04-01), Lesniak
patent: 6327030 (2001-12-01), Ifju et al.
Zandman et al., “Photoelastic Coatings,” The Iowa State University Press, Ames, Iowa, 43-52, and 69-71, 1979.

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