Optics: measuring and testing – Material strain analysis – By light interference detector
Patent
1991-03-28
1993-01-05
Turner, Samuel A.
Optics: measuring and testing
Material strain analysis
By light interference detector
356345, 356351, 356 33, 25022719, G01L 124
Patent
active
051775557
ABSTRACT:
A method and apparatus for optically determining the distribution of normal force present at the mating surfaces of an electrical surface connector uses the birefringent properties of a photoelastic material. Photoelastic members are distributed between the two planar surfaces, and plane-polarized, narrow-band wave-length light is coupled into each member with an optical fiber. The light is directed to propagate along a principle strain axis of the photoelastic member. The temporarily birefringent photoelastic material provides a relative propagation delay between vector components of the light in each member which are perpendicular to the propagation direction. The light exiting each member is input to a plane polarizer, the output of which is measured with an intensity meter. The relative delay between the vector components creates a detectable change in intensity at the intensity meter. Correlation of the measurements for all the photoelastic members give a distribution of the forces across the planar surfaces.
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Laird Terri G.
Stratton Mark D.
Digital Equipment Corporation
Hudgens Ronald C.
Myrick Ronald E.
Turner Samuel A.
Young Barry N.
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