Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1998-09-17
2000-02-15
Font, Frank G.
Optics: measuring and testing
For optical fiber or waveguide inspection
356426, G01N 2100
Patent
active
06025906&
ABSTRACT:
Methods and apparatus for detecting air/cladding and core/cladding interfaces of blanks (13) used to produce optical waveguide fibers are provided. A beam of coherent light (30) is scanning across the blank (13) and spatial light intensity patterns produced thereby (FIG. 5) are detected and analyzed. Air/cladding interfaces correspond to a decrease in the width of a unimodal spatial light intensity pattern as the beam moves towards the center of the blank (FIGS. 5A and 5B). Core/cladding interfaces correspond to the onset of an at least bimodal spatial light intensity pattern as the beam moves towards the center of the blank (FIGS. 5D and 5E). By rotating the blank and repeating the measurement process at two or more angular positions, concentricity and ellipticity values for a blank can be determined.
REFERENCES:
patent: 4168907 (1979-09-01), Presby
patent: 5118954 (1992-06-01), Grosso
patent: 5408309 (1995-04-01), Shimada et al.
Hepburn Jerry L.
Lorey Franziska L.
Pastel David A.
Wagner Robert S.
Carlson Robert L.
Corning Incorporated
Font Frank G.
Nguyen Tu T.
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