Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1989-11-03
1991-03-05
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
73160, G01N 2184
Patent
active
049972766
ABSTRACT:
The elastic properties of an optical fiber (10) are determined from measurements of the contact area (20, 24) of the optical fiber (10) against a surface (16, 22), under a loading perpendicular to the surface. In a preferred approach, an optical fiber is passed over a curved surface (22) of a transparent lens in the form of a pulley (38), with a tension applied to the optical fiber (10). The buffer layer (14) of the optical fiber (10) is flattened against the curved contact surface (22), forming a contact region (24) whose area is measurable. The relative elastic deformability of the buffer layer (14), a function of its elastic modulus, is determined from the contact area and other measurable parameters. Contact area measurement is performed continuously as the optical fiber (10) is passed over the pulley (38) by monitoring the amount of light that is transmitted through the contact region (24). The variations in the elastic properties of the optical fiber (10) may therefore be measured continuously as the optical fiber (10) is transported over the pulley (38).
REFERENCES:
patent: 4940891 (1990-07-01), Rast
Brown C. D.
Denson-Low W. K.
Heald R. M.
Hughes Aircraft Company
McGraw Vincent P.
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