TITLE:
Opto-Mechanical Properties of PTFE Fibres Using Phase Shifting Interferometry
AUTHORS:
Khaled Yassien, Mohamed El Bakary
KEYWORDS:
Phase Shifting Interferomerty, Mechanical Properties, Birefringence, PTFE Fibres
JOURNAL NAME:
Optics and Photonics Journal,
Vol.4 No.6,
June
27,
2014
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.