G - Physics – 01 – N
Patent
G - Physics
01
N
73/54
G01N 21/23 (2006.01) G01L 1/24 (2006.01)
Patent
CA 1156488
ABSTRACT A new method and apparatus. has been developed to experimentally determine the state and amount of birefringence in an arbitrary plane within a birefrin- Rent body- Such information can be used to determine the optical anisotropy in solid and liquid bodies, the residual and induced stress fields, etc. This apparatus represents an essential development and basic modification of the apparatus developed by J.T. pindera (J.T. Pindera and S. Mazurkiewicz "Photo- elastic Isodynes: A New Type of Stress-Modulated Light Intensity Distribution", Mechanics Research Communications, Vol. 4, No. 4, 197/), which utilizes J.T. Pindera's "collecting prism" in a scanning mode (J.T. Pindera and P. Stranka "Response of the Intergrated Polariscope", Journal of Strain Analysis, Vol. 8, No. l, 1973). The suitably modified "collecting prism" is called ISODYNE SLECTOR. The ISODYNE SELECTOR, when applied in a scanning mode produces lines of constant light intensities which are the lines of constant values of accumulated bire- frigence. for plane stress states in engineering objects such lines are identical with the elastic isodynes and are therefore called photoelasticis dynes. Two independent fields of such isodynes allow to determine directly all three stress component of plane stress state, and give an additional relocation between stress components. This is the only experimental method supplying directly four independent data on stress stare at each point.
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