Optical strain gauge

Details Optical strain gauge Optical strain gauge

1977-10-31

1979-08-07

Myracle, Jerry W.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

356 32, G01N 300

Patent

active

041633970

ABSTRACT:
An apparatus is disclosed for measuring strain in a solid object, wherein the apparatus is arranged to use the deflection of a light guiding structure as a strain responsive element for determining the amount of applied stress to be measured. The apparatus typically comprises a curved light guiding structure including a medium of given refractive index surrounded by a medium of lower refractive index than that of the medium of given refractive index; means for injecting light into the structure and means for analyzing the change in the propagation characteristics of the light emerging from the structure; and, means for attaching and maintaining the light guiding structure to the solid object in such a way that stresses acting upon the object are translated into changes of the curved form of the structure, creating changes in the propagation of the injected light whereby the strain in the object can be determined.

REFERENCES:
patent: 4071753 (1978-01-01), Fulenwider et al.

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