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Comprehensive study of electronic polarizability and band gap of B_(2)O_(3)-Bi_(2)O_(3)-ZnO-SiO_(2)glass network

Journal of Advanced Dielectrics 2017年第5期7卷 25-31页

作者： Iskandar Shahrim Mustafa Nur Ain Nabilah Razali Nurul Zahirah Noor Azman Nor Zakiah Yahaya muhammad zulhafiz mohamad zaini Nur Lina Rusli muhammad Bakhsh Nizamani Halimah Mohamed Kamari School of Physics University of Science Malaysia 11800 USMPulau PinangMalaysia Institute of Nano-optoelectronics Research University of Science Malaysia 11800 USM Pulau PinangMalaysia School of Distance Education University of Science Malaysia 11800 USM Pulau PinangMalaysia Science Faculty University Putra Malaysia 43400 SerdangSelangorMalaysia

Quaternary glasses were successfully fabricated using melt quenching technique based on the chemical compound composition(x)Bi_(2)O_(3)–(0:5-x)ZnO-(0.2)B_(2)O_(3)–(0.3)SiO_(2),where(x=0.1,0.2,0.3,0.4,0.45)*** sources of SiO_(2)was produced from rice husk ash(RHA)at 99.36%of SiO_(2).The Urbach energy was increased from 0.16 eV to the 0.29 eV as the mole of Bi_(2)O_(3)increased in the glass *** indirect energy band gap is indicated in decrement pattern with 3.15 eV towards 2.51 *** results of Urbach energy and band gap energy that were obtained are due to the increment of Bi^(3+)ion in the glass *** refractive indexes for the prepared glasses were evaluated at 2.36 to 2.54 based on the Lorentz–Lorentz formulation which correlated to the energy band *** calculated of molar polarizability,electronic polarizability and optical basicity exemplify fine complement to the Bi_(2)O_(3)addition in the glass *** glass sample was indicated in amorphous state.

关键词： Urbach energy energy band gap optical polarizability Lorentz-Lorentz X-ray powder diffraction

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Strain Sensor Based on Embedded Fiber Bragg Grating in Thermoplastic Polyurethane Using the 3D Printing Technology for Improved Sensitivity

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Photonic Sensors 2022年第3期12卷 68-78页

作者： Harith AHMAD mohamad Ashraff ALIAS Mohammad Faizal ISMAIL Nor Najwa ISMAIL muhammad Khairol Annuar zaini Kok Sing LIM Gilberto BRAMBILLA Kenneth T.V.GRATTAN B.MAzizur RAHMAN Photonics Research Centre University of MalayaKuala Lumpur 50603Malaysia Department of Physics Faculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK School of Mathematics Computer Science and EngineeringCity University of LondonLondon EC1V 0HBUK

A new and easy-to-fabricate strain sensor has been developed,based on fiber Bragg grating(FBG)technology embedded into a thermoplastic polyurethane filament using a 3-dimensional(3D)*** advantage of the flexibility and elastic properties of the thermoplastic polyurethane material,the embedding of the FBG provides durable protection with enhanced flexibility and sensitivity,as compared to the use of a bare *** of an evaluation of its performance have shown that the FBG sensors embedded in this way can be applied effectively in the measurement of strain,with an average wavelength responsivity of 0.0135 nm/cm of displacement for tensile strain and -0.0142 nm/cm for compressive strain,both showing a linearity value of up to 99%.Furthermore,such an embedded FBG-based strain sensor has a sensitivity of~1.74 times greater than that of a bare FBG used for strain measurement and is well protected and suitable for in-the-field *** is also observed that the thermoplastic polyurethane based(TPU-based)FBG strain sensor carries a sensitivity value of~2.05 times higher than that of the polylactic acid based(PLA-based)FBG strain sensor proving that TPU material can be made as the material of choice as a“sensing”pad for the FBG.

关键词： Fiber-optic sensors fiber Bragg grating 3D printing technology multiple-point strain measurement

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