Fiber geometry parameter measurement

An automatic method of measuring fiber geometry parameters is described. The parameters include core diameter, cladding diameter, core non-circularity, cladding non-circularity and core/cladding concentricity. The image of the fiber under test is received by a CCD camera and transferred to an image grabber plugged in a microcomputer for further analysis. Several digital image-processing methods are used to remove the noise in fiber image. The image segment algorithm is used to extract data points. The data is analyzed using different algorithms to give the geometry parameters of the fiber. Sophisticated software is programmed. An instrument is developed based on the hardware and software described above. All of the parameters and graphics can be obtained within 30 seconds. The repeatability of the instrument is as follows: core diameter, cladding diameter, core non- circularity, cladding non-circularity, core/cladding concentricity.