The transport of intensity equation (TIE) technique is used to investigate the effect of stretching and annealing conditions on the optical features and antimicrobial activity of polyethylene terephthalate (PET) fibers treated with TiO
2
nanoparticles. The main core of this paper gets the most preferable optical and mechanical properties for PET/TiO
2
fiber which maintains its antibacterial activity. The variation of the refractive index of untreated PET/TiO
2
fiber along its axis is studied. The computed tomography technique is used to investigate the morphology of the tested fiber and the distribution of TiO
2
nanoparticles inside the fiber. The effect of stretching on the refractive index and the density of TiO
2
nanoparticles of drawn PET/TiO
2
fibers are carried out. The antimicrobial activity of the PET/TiO
2
fibers are evaluated before and after stretching. The PET/TiO
2
fibers are annealed at different temperatures and durations. The influence of annealing on the variation of the refractive index of PET/TiO
2
fiber along its axis and the distribution of TiO
2
is investigated.
In this article, an adaptive denoising method is suggested to accurate investigate the optical and structural features of polymeric fibers from noisy phase shifting microinterferograms. The mixed class of noise that may produce in the phase‐shifting interferometric techniques is established. To our knowledge, this is an early study considered the mixing noises that may occur in microinterferograms. The suggested method utilized the convolution neural networks to detect the noise class and then denoising, it according to its class. Four convolution neural networks (Googlenet, VGG‐19, Alexnet, and Alexnet–SVM) are refined to perform the automatic classification process for the noise class in the established data set. The network with the highest validation and testing accuracy of these networks is considered to apply the suggested method on realistic noisy microinterferograms for polymeric fibers, polypropylene and antimicrobial polyethylene terephthalate)/titanium dioxide, recoded using interference microscope. Also, the suggested method is applied on noisy microinterferograms include crazing and nanocomposite material. The demodulated phase maps and the three‐dimensional birefringence profiles are calculated for tested fibers according to the suggested method. The obtained results are compared with the published data for these fibers and found to be in good agreements.
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