Abstract
In this paper, we present a nonray-tracing technique for evaluating the three dimensional distribution of the refractive index values inside polymeric fibres. This technique, named single-frame computed-tomography (SFCT)', is applied to digital holography. A comparative study between the calculated optical phase values using ordinary tomography and SFCT is carried out, and a negligible deviation is detected. The proposed technique is used to determine the three-dimensional refractive index profile of isotactic Polypropylene fibres, IPP. The variation of the optical properties is measured before, during and after the formation of the necking phenomenon. In addition, SFCT technique is applied to the online determination of the change of the optical properties of IPP fibres. Holograms are given for illustration.
Lay Description In this article we suggest a technique for evaluating the three dimensional distribution of the refractive index values inside polymeric fibres. This technique, named single-frame computed-tomography (SFCT), is applied to digital holography. A comparative study between the calculated optical optical phase values using ordinary tomography and single-frame computed tomography is carried out, and a negligible deviation is detected. The proposed technique is used to determine the 3D refractive index profile of isotactic Polypropylene fibres, IPP.