Interferometry of Fibrous Materials

Barakat, N.; Hamza, A. A.

doi:10.1201/9781003069492

Cited by 15 publications

(19 citation statements)

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“…When the fiber material is an anisotropic, the fiber has two refractive indices, one for the polarized light parallel to the fiber axis ( n || ) and the second for polarized light perpendicular to the fiber axis ( n ┴ ). The refractive indices of the fiber are given by the following equation (Barakat & Hamza, ):

n^{i} = n_{L} \pm \frac{ϕ_{0}^{i}}{t} \frac{λ}{2 π}

…”

Section: Theoretical Considerationsmentioning

confidence: 99%

“…Conventional interferometric techniques (Barakat & Hamza, ; Hamza, Sokkar, & El‐Bakary, ) and digital holographic interferometry (Schnars & Juptner, ) are valuable and accurate methods for characterizing fibrous materials (Yassien & Agour, ; Yassien, Agour, El‐Dessouky, & Kopylow, ; Yassien & El‐Bakary, ). These techniques can evaluate quickly and precisely the refractive indices, birefringence, and other optical properties of fibers.…”

Section: Introductionmentioning

confidence: 99%

“…Also, DHI enables the numerical focusing of the interferograms and emulates the manual focusing control of conventional microscopes (Schnars & Juptner, ). Many authors used the interferometric and DHI techniques for determining the physical and structural properties of polymer and textile fibers (Barakat & Hamza, ; El‐Bakary, ; Hamza, Belal, Sokkar, El‐Bakary, & Yassien, ; Yassien, Abd‐Elrahman, & El‐Bakary, ). Recently, Yassien and Agour () used DHI phase shifting method for studying the effects of temperature on the optical and dispersion properties of basalt fiber.…”

Section: Introductionmentioning

confidence: 99%

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Effect of gamma irradiation on the physical and structural properties of basalt fiber

Yassien

El‐Bakary

2019

Microscopy Res & Technique

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Digital holographic interferometry (DHI), X‐ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR) and scanning electron microscopy (SEM) were used to study the effects of gamma irradiation on the physical and structural properties of basalt fibers. For this purpose, set samples of basalt fibers were subjected to different doses of gamma irradiation (3, 10, 25, and 40 kGy). The Mach–Zehnder interferometer was used to capture holographic patterns which are used then to determine the unwrapped phase. From the unwrapped phase distributions, the optical path difference within the irradiated basalt samples was determined. Thus, refractive indices, and birefringence of irradiated basalt fibers were determined at different irradiation doses using DHI method. XRD technique was used to investigate the effect of irradiation doses on the crystalline behavior of fibers. FTIR was performed to each of the basalt samples to evaluate the changes in the surface chemical properties due to radiation exposure doses. The morphology of irradiated fibers was examined using SEM. The results indicate that basalt fiber has a resistance to gamma radiation. There are no significant effects on the physical, structural and chemical properties were demonstrated of basalt fibers in the doses range of irradiation.

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n^{i} = n_{L} \pm \frac{ϕ_{0}^{i}}{t} \frac{λ}{2 π}

…”

Section: Theoretical Considerationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of gamma irradiation on the physical and structural properties of basalt fiber

Yassien

El‐Bakary

2019

Microscopy Res & Technique

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“…The study of the light ray tracing inside the fiber, under a variety of different circumstances, was the subject of great interest among scientists specialized in studying the optical properties of transparent materials. Many researchers have sought to study the characteristics of fibers that have different forms of cross sections and structure, and the studies have yielded important and interesting results (see e.g., Barakat & Hamza, , and the references therein).…”

Section: Introductionmentioning

confidence: 99%

A modified formula for accurate determination of three‐dimensional birefringence of fiber using modified subfringe integration method

El‐Morsy

2019

Microscopy Res & Technique

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The development of the use of interferometric techniques in the study of the optical properties of materials encouraged many researchers to work on the derivation and development of the theoretical considerations and the equations used in the calculations of those properties. The form of these equations depends on the technique used and the cross section of the sample, and also on the method of calculating the optical path difference of light across the sample studied. A modified formula to calculate the three‐dimensional birefringence distribution of the fiber, without the need to determine the refractive indices of the fiber in the parallel and perpendicular directions, was presented. The phase distribution of the simulated and experiment interferograms was obtained using subfringe integration method. The results obtained from the new method were compared with the calculated results of a well‐known method (Z method) and the figures presented showed that the results of the two methods were close to each other.

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“…The polymer fibers exhibits specific optical properties, which reflect the physical behavior and internal structure of the fibers. The optical anisotropy and birefringence are important for determining the molecular orientation, structural homogeneity, and other structural properties of the fibers .…”

Section: Introductionmentioning

confidence: 99%

Interferometric determination of the physical properties of annealed isotactic polypropylene fibers

Yassien

Abd‐Elrahman

El‐Bakary

2018

Polymer Engineering & Sci

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Automated variable wavelength interference microscope was used to study the effect of annealing process on the physical properties of isotactic polypropylene fibers (4:1 draw ratio, 515 tex, Bolton UK). The isotactic polypropylene (iPP) fibers were annealed at temperatures ranging from 60°C to 140°C. The spectral dispersion curves of refractive indices and birefringence of iPP fibers were determined at different annealing temperatures. The resulting data were used to determine the optical orientation function, orientation angle, degree of crystallinity, and dispersion parameters of the annealed samples. The study indicates that, the measured birefringence, orientation function, and the dispersion of crystallinity of iPP fibers have been improved with the increasing of annealing temperature. POLYM. ENG. SCI., 59:35–41, 2019. © 2018 Society of Plastics Engineers

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Interferometry of Fibrous Materials

Cited by 15 publications

References 0 publications

Effect of gamma irradiation on the physical and structural properties of basalt fiber

Effect of gamma irradiation on the physical and structural properties of basalt fiber

A modified formula for accurate determination of three‐dimensional birefringence of fiber using modified subfringe integration method

Interferometric determination of the physical properties of annealed isotactic polypropylene fibers

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