Determination of angular position of weak axial asymmetries of o

Details Determination of angular position of weak axial asymmetries of o Determination of angular position of weak axial asymmetries of o

1997-07-16

1998-12-15

Font, Frank G.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2100

Patent

active

058502831

ABSTRACT:
In determining the angular rotational position of axial asymmetries of bodies like optical PM-fibers such a body or fiber is illuminated during rotations thereof to different angular positions around its longitudinal axis. For different angular positions the difference is then determined between light, which has passed through the fiber end and in its position corresponds to the central part of the fiber, and light, which has passed through the fiber end and in its position corresponds to the region of the fiber located immediately outside the central part. These differences, considered as a function of the rotation angle, constitute a curve that is analyzed for finding the regions thereof having the steepest descent or increase, such as a valley region. Only these regions are then used for determining the position of the optical asymmetries. Thus the fiber can be rotated during only this interval determining the curve more accurately by using more densely spaced measurement points within the interval. Such a determination is particularly suited for PM-fibers having very small optical asymmetries such as fibers having an elliptical core.

REFERENCES:
patent: 5323225 (1994-06-01), Dyott
patent: 5572313 (1996-11-01), Zheng et al.

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