Method for dynamic interference pattern testing

Optics: measuring and testing – Material strain analysis – By light interference detector

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356354, G01B 902

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active

057036802

ABSTRACT:
When the pressure on a reinforced rubber object is varied, weaker portions of the object expand more than surrounding areas of the object. By (a) illuminating the object with single phase monochromatic light which is separated into more than one beam, (b) causing the object to distort by abrasion or expansion, (c) observing the interference patterns on the object as it distorts and (d) analyzing stress patterns revealed by the interference patterns, these physical changes can be detected, recorded and analyzed.

REFERENCES:
patent: 4794550 (1988-12-01), Greivenkamp
patent: 5257088 (1993-10-01), Tyson et al.
Direct Determination of Flexural Strain in Plates Using Projected Gratings, Liang et al, Sep. 1978, pp. 401-405.

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