Abstract
A nondestructive method is presented to determine simultaneously the
refractive index profile and the cross section geometry of optical fiber
preforms. An improved formula for calculating the optical path length from
the deflection function is derived. The preform is rotated through
180° and the deflection angle data collected, then the back
projection technique and linear interpolation algorithm are used in the
computed tomographic two-dimensional (2-D) profile reconstruction for
preforms of nonuniform cross section. To minimize the computing time, the
spatial Nyquist frequency is analytically used to estimate the angle
sampling number of views and the numbers of points per scan in advance.
Numerical simulations and experimental results show that using 180°
angle of view deflection data, accurate preform index distribution
reconstructions are obtained.
© 2004 IEEE
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