Optics: measuring and testing – Material strain analysis – With polarized light
Patent
1983-02-28
1987-07-14
Willis, Davis L.
Optics: measuring and testing
Material strain analysis
With polarized light
73800, G01B 1118
Patent
active
046799338
ABSTRACT:
A new method and device has been developed to determine experimentally the state and amount of birefringence along any arbitrary direction through a birefringent body. Such information can be used to determine the optical anisotropy of solid and liquid bodies, the residual and induced stress fields, etc. Essentially, this method and device separates, from the light scattered in all directions along an arbitrary path of laser light in a body, three sheets of light which are subsequently collimated; each of these light sheets contains parallel light rays carrying information of interest. The middle light sheet indicates the line of measurements, which is identical with the path or position of laser beam in a body. The two outer light sheets carry two complementary and independent pieces of information on the state and amount of birefringence along the line of measurements. Thus, both outer sheets of light can be used simultaneously to increase the reliability and accuracy of the birefringence measurements.
REFERENCES:
Mazurkiewicz et al., "Integrated-Plane Photoelastic Method-Application of Photoelastic Isodynes", Experimental Mechanics, vol. 19, No. 7, pp. 225-234, Jul. 1979.
Koren Matthew W.
Willis Davis L.
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