Title :
Nondestructive measurement for arbitrary RIP distribution of optical fiber preforms
Author :
Zhao, Yucheng ; Fleming, Simon ; Lyytikainen, Katja ; Poladian, Leon
Author_Institution :
Australian Photonics Cooperation Res. Centre, Univ. of Sydney, Eveleigh, NSW, Australia
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.
Keywords :
image reconstruction; image sampling; nondestructive testing; optical fibre testing; optical tomography; refractive index; angle sampling number; back projection technique; computed tomographic two-dimensional profile reconstruction; cross section geometry; deflection angle data; deflection function; linear interpolation algorithm; nondestructive measurement; optical fiber preforms; optical path length; preform index distribution reconstructions; refractive index profile; spatial Nyquist frequency; Frequency estimation; Geometrical optics; Interpolation; Optical fibers; Optical refraction; Optical variables control; Preforms; Refractive index; Tomography; Two dimensional displays;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2004.824464