Method and apparatus for controlling internal rotation of princi

Details Method and apparatus for controlling internal rotation of princi Method and apparatus for controlling internal rotation of princi

1992-06-29

1993-12-07

Gregory, Bernarr E.

Optics: measuring and testing

For optical fiber or waveguide inspection

65 2, 65 311, 65 29, G01N 2100, C03B 37075

Patent

active

H00012688

ABSTRACT:
A technique and apparatus for detecting the internal rotation of the principal axes in the fabrication of birefringent fibers is based upon a new method for producing and interpreting the interference fringe pattern backscattered power from a birefringent fiber side-illuminated with a laser light source to determine the internal orientation of the strain-inducing axes. An apparatus employing this technique for controlling internal rotation of the principal axes provides for adjustment of the orientation of at least one of the traction surfaces pulling the fiber during drawing fabrication to maintain parallel alignment of the planes of rotation of the surfaces to reduce the fiber rotation-inducing motion which leads to internal rotation of the fiber's principal axes.

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