Optical birefringence and molecular orientation of crazed fibres utilizing the phase shifting interferometric technique

•The Pluta microscope was used as a phase shifting interferometric (PSI) technique.•A calibrated stepper motor was added to the micrometer screw of Pluta microscope.•This technique was used to show the effect of crazes on the phase of PP fibres.•The effect of the crazes on the optical properties of...

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Bibliographic Details
Published in:Optics and laser technology 2017-09, Vol.94, p.208-216
Main Authors: Sokkar, T.Z.N., El-Farahaty, K.A., El-Bakary, M.A., Omar, E.Z., Hamza, A.A.
Format: Article
Language:English
Subjects:
Birefringence
Crazing
Four-shot phase shifting technique
Fracture
Interferometry
Molecular orientation
Optical fibers
Optics
Orientation
Phase distribution
Polymers
Polypropylene
Spatial carrier frequency technique
Test procedures
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Summary:•The Pluta microscope was used as a phase shifting interferometric (PSI) technique.•A calibrated stepper motor was added to the micrometer screw of Pluta microscope.•This technique was used to show the effect of crazes on the phase of PP fibres.•The effect of the crazes on the optical properties of PP fibres was demonstrated.•The carrier frequency method was used to show the role of outer layers crazes. In this article, the features of the phase shifting interferometric technique were utilized to investigate the effect of the presence of crazes in both outer and inner layers on optical birefringence and molecular orientation of polypropylene fibres. The Pluta polarizing interference microscope was used as a phase shifting technique. This method includes adding a stepper motor with a control unit to the micrometer screw of the Pluta microscope. This optical system was calibrated to be used as a phase shifting interferometric technique. The advantage of this technique is that it can detect the crazes in both inner and outer layers of the sample under test. Via this method, the relation between the presence of the crazes (in both inner and outer layers) and the optical molecular orientation of polypropylene (PP) fibres was demonstrated. To clarify the role of this method, the spatial carrier frequency technique was used to show the effect of the presence of the crazes only in the outer layers on the phase distribution values and hence the structural properties of PP fibres.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2017.03.037