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人工晶体学报 2000年第S1期29卷 219-页

作者：赵渭忠张守业浙江大学物理系杭州310027 浙江大学材料科学与工程系杭州310027

Magneto optic(MO) fiber current sensors utility the Faraday effect of magneto op tic materials to sensing the magnetic(current)*** optical fiber sensors(O FS)offer great advantages of simple structure,high reliability,high accuracy and sensibility,immunity to electromagnetic *** are the most promised method to substitute the conventional current transducers(CTs),much attentions were focused on both domestic and *** optic properties of Faraday se n sing element have much affect on the performance of the optical fiber current se *** used in the sensor system,MO materials with magneto optic characterist i cs of large Faraday rotation(FR)angle θ f ,low temperature sensibility,and suitable saturation field were general demanded. Development of MO materials is one of the most important problems of optical fiber current sensor research. In this paper,one mixed doped Bi substituted yttrium iron garnet crystal BiYb:Y I G, which has large and temperature stable FR angle,was grown from high temperatu re *** taking PbO+PbF 2 as the main flux,under the compositions of molar ra tio Y 2O 3:Yb 2O 3:Bi 2O 3:Fe 2O 3:(PbO+PbF 2+B 2O 3+CaCO 3)=7.64:1. 04:1.74:20.78:78:68.8,crystals of quite good quality were grown from melt flux,t he largest one has the size of 22mm×15mm×*** optic proprieties of Fa raday rotation angle and optical absorption spectrum of the BiYb:YIG crystal,expecial ly Y 2.289 Yb 0.246 Bi 0.465 Fe 5O 12 ,in the range of 0.7 1.9 μm waveband were *** λ =1.55μm,the BiYb:YIG crystal has special Fa raday rotation angle of -404deg/cm,temperature coefficient 4.2×10 -6 K -1 ,optical absorption coefficient 3.6cm -1 ,and figure of merit 25.8deg/dB . The results indicate that substituted with Bi 3+ can largely improve the Fa raday rotation of rear earth iron *** Faraday rotation angles of Yb 3Fe 5O 12 and Y 3Fe 5O 12 have opposite temperature dependency,ut ility the compensation effect of mix doped,co doped wit

关键词： magneto optic crystal Faraday rotation optical fiber sensors current sensors flux method

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Cladding Modified fiber Bragg Grating for Copper Ions Detection

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Semiconductor Science and Information Devices 2021年第2期3卷 12-16页

作者： Husam Abduldaem Mohammed Aqiel Almamori Ali A.Alwahib Electronic and Communication Engineering Department College of EngineeringUniversity of BaghdadBaghdad47202Iraq Department of Laser and Optoelectronics Engineering University of TechnologyBaghdad47202Iraq

This paper reports a fiber Bragg grating(FBG)as a *** FBGs were etched using a chemical agent,namely,hydrofluoric acid(HF).This implies the removal of some part of the cladding ***,the evanescent field propagating out of the core will be closer to the environment and become more sensitive to the change in the *** proposed FBG sensor was utilized to detect toxic heavy metal ions aqueous medium namely,copper ions(Cu^(2+)).Two FBG sensors were etched with 20 and 40μm diameters and *** sensors were studied towards Cu^(2+)with different concentrations using wavelength shift as a result of the interaction between the evanescent field and copper *** FBG sensors showed a good response in terms of significant wavelength shift in corresponding to varying Cu2+concentrations when immersed in aqueous *** sensors exhibited excellent repeatability towards Cu *** results demonstrate that the smaller FBG etching diameter,the better optical response in terms of wavelength and linearity.

关键词： fiber Bragg grating optical fiber sensors Etched fiber C-band D-heavy metals

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