Abstract
Polytetrafluoroethylene (PTFE) is one of a class of polymer that has many unique properties, which make it valuable in scores of applications. Here, the molecular alignment effect in fibre drawing and its relation with nonlinear optical properties of the PTFE fibres were studied by means of interferometry. For this propose, the phase shifting Mach-Zehnder interferometer was utilized. The fibre drawing device was attached to the interferometer for measuring the opto-mechanical properties of PTFE fibres. From the recorded interferomgrams the wrapped phase map and its contour line were determined using the phase shifting interferometry (PSI) method. From the contour lines the refractive index, refractive index profile, birefringence, polaryzability and orientation function of the investigated sample were determined at different draw ratios. The PSI method showed good results for enhancing the noisy fringe pattern and for obtaining contour line microinterferograms. This study offers the correlation between the mechanical properties and the structure properties of fibres. Thus, a better structure-property correlation can improve the technical and industry performance of the fibres.
Highlights
The orientated polymer can be produced by hot stretching of a molten polymer followed by rapidly cooling ofHow to cite this paper: Yassien, K. and El Bakary, M. (2014) Opto-Mechanical Properties of PTFE Fibres Using Phase Shifting Interferometry
Image processing can be used to enhance the fringe patterns and remove noise before the phase is evaluated [11] [12]. Another promising method used for analyzing the interferograms and extracting the interference phase of the fringe pattern by recording additional information [13] is referred as the phase shifting interferometry (PSI) method
R2 − xQ2 where R is the fiber radius, a is the layer thickness (a = R/N), N is the number of layers, Q and j are the limits of the layer numbers, n0 = nL is the liquid refractive index, nj and nQ are the refractive indices of the jth and Qth layers, respectively. dQ is the distance between the incident and the fiber centre, xQ is the distance between the emerging beam and the fiber centre, ZQ is the fringe shift corresponding to the point xQ in the two-beam interference pattern, λ is the wavelength of light used and b is the interfering spacing
Summary
How to cite this paper: Yassien, K. and El Bakary, M. (2014) Opto-Mechanical Properties of PTFE Fibres Using Phase Shifting Interferometry. (2014) Opto-Mechanical Properties of PTFE Fibres Using Phase Shifting Interferometry. Image processing can be used to enhance the fringe patterns and remove noise before the phase is evaluated [11] [12] Another promising method used for analyzing the interferograms and extracting the interference phase of the fringe pattern by recording additional information [13] is referred as the phase shifting interferometry (PSI) method. Yassien [19] applied phase shifting interferometry PSI to study and determine the optical properties of PVDF fibres. This work is motivated to determine the opto-mechanical and structural physical properties of PTFE fibres using a fibre drawing device attached the phase shifting Mach-Zehnder interferometer. Themolecular alignment effects in fibre drawing which is related to linear and possibly nonlinear optical properties of the polymer fibres were investigated
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