DETECTING METHOD AND DEVICE FOR CORE/CLAD INTERFACE OF LIGHT GUIDE PATH BLANK

    公开(公告)号:JPH11183316A

    公开(公告)日:1999-07-09

    申请号:JP27113098

    申请日:1998-09-25

    Applicant: CORNING INC

    Abstract: PROBLEM TO BE SOLVED: To provide an improved technique for detecting the core/clad interface position of a blank used for manufacturing a light guide path fiber. SOLUTION: A method and a device for detecting the air/clad and core/clad interface of a blank 13 used for manufacturing a light guide path fiber are provided. A coherent light beam is scanned across the blank 13, and a space light intensity pattern generated by it is detected and analyzed. When the beam is moved in the center direction of the blank 13, the air/clad interface corresponds to the decrease of the width of a single-mode space light intensity pattern. When the beam is moved in the center direction of the blank 13, the air/clad interface corresponds to at least the start point of a two-mode space light intensity pattern. When the blank 13 is rotated and the measuring process at two or more angle positions is repeated, the concentricity and ellipticity of the blank 13 can be determined.

    METHODS AND APPARATUS FOR DETECTING SURFACE DEFECTS OF AN OPTICAL FIBER

    公开(公告)号:CA2288765A1

    公开(公告)日:1998-11-26

    申请号:CA2288765

    申请日:1998-05-12

    Applicant: CORNING INC

    Abstract: Detectors detecting flashes caused by the escape of light from the surface of an optical fiber as it rapidly passes a detection point suitable for use in online detection of optical fiber flaws. A detector includes a plurality of view systems, each view system consisting of a spherical mirror (608), a plurality of lenses and a detector (616). Each spherical mirror (608) is placed at its radius of curvature from an optical fiber (618) to be tested for flaws. A first lens (610) of each view system is placed at its focal length away from the optical fiber (618), opposite the mirror. A second lens (612) of each view system is placed opposite the first lens (610). The detector (616) is placed at the focal length of the second lens (612) away from the second lens (612), opposite the first lens (610). Additional lenses may be placed between the first lens (610) and the second lens (612) of each view system. The use of multiple view systems reduces or eliminates the dead zone of the detection system. All of the above approaches may be employed to detect flaws as an optical fiber is rapidly moved past the detector. Flaws may be discriminated and recorded in real time providing improved quality control, and manufacturing process data.

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