检索结果-南通市图书馆

Strain Sensor Based on Embedded fiber bragg grating in Thermoplastic Polyurethane Using the 3D Printing Technology for Improved Sensitivity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

Determination of the Postmortem Interval Using fiber bragg grating Sensors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2023年第3期19卷 831-844页

作者： M.Adjailia H.Derbal Habak Y.Hamaizi H.Triki Radiation Physics Laboratory Department of PhysicsFaculty of SciencesBadji Mokhtar UniversityAnnabaAlgeria Univesity of Picardie Jules Verne LTI LaboratoryAimensFrance

fiber bragg grating(FBG)sensors are often used in monitoring activities and to ensure that environmental parameters satisfy industrial *** offer crucial safety measures in the early detection of hazards due to their greatly reduced size,low weight,flexibility,and immunity to electromagnetic *** characteristics make FBGs suitable also for use in relation to the human body for in vivo measurements and long-term *** this study,recent developments are presented with regard to the utilization of these sensors to measure the so-called post-mortem interval(PMI).Such developments rely on numerical simulations based on the Matlab software and monitoring of the rectal temperature,which is one of the main parameters for estimating the ***,the Matlab software is used to solve the Henssge equation for different ambient temperatures and for different body masses;then a bragg grating sensors is used for post-mortem *** results and their accuracy are discussed.

关键词： fiber bragg grating temperature sensors Henssge’s nomogram post-mortem interval biomedicine

Encrypted optical fiber tag based on encoded fiber bragg grating array

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2023年第3期5卷 658-665页

作者： Zhihao Cai Bozhe Li Zhiyong Bai Dejun Liu Kaiming Yang Bonan Liu Cong Zhao Mengqiang Zou Jie Zhou Shangben Jiang Jingyi Huang Li Liu Xuming Zhang Junle Qu Yiping Wang Changrui Liao Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things Guangdong and Hong Kong Joint Research Centre for Optical Fibre SensorsState Key Laboratory of Radio Frequency Heterogeneous IntegrationShenzhen UniversityShenzhen 518060People’s Republic of China Shenzhen Key Laboratory of Ultrafast Laser Micro/Nano Manufacturing Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education/Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Guangdong Laboratory of Artificial Intelligence and Digital Economy(SZ) Shenzhen 518107People’s Republic of China Department of Electronic Engineering Chinese University of Hong KongHong KongPeople’s Republic of China Department of Applied Physics The Hong Kong Polytechnic UniversityHongKongPeople’sRepublic of China

Optical fibers are typically used in telecommunications services for data transmission,where the use of fiber tags is essential to distinguish between the different transmission fibers or channels and thus ensure the working functionality of the communication *** physical entity marking methods for fiber labeling are bulky,easily confused,and,most importantly,the label information can be accessed easily by all potential *** work proposes an encrypted optical fiber tag based on an encoded fiber bragg grating(FBG)array that is fabricated using a point-by-point femtosecond laser pulse chain inscription *** with different resonant wavelengths and reflectivities are realized by adjusting the grating period and the refractive index *** is demonstrated that a binary data sequence carried by a fiber tag can be inscribed into the fiber core in the form of an FBG array,and the tag data can be encrypted through appropriate design of the spatial distributions of the FBGs with various reflection wavelengths and *** proposed fiber tag technology can be used for applications in port identification,encrypted data storage,and transmission in fiber networks.

关键词： fiber bragg grating femtosecond laser micromachining encrypted information optical fiber tag

Effect of Temperature and Gamma-Ray Irradiation on Optical Characteristics of fiber bragg grating Inscribed Radiation-Resistant Optical fiber

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Photonic Sensors 2020年第1期10卷 16-33页

作者： Seongmin JU Youngwoong KIM Kadathala LINGANNA Yune Hyoun KIM Won-Taek HAN School of Electrical Engineering and Computer Science Gwangju Institute of Science and TechnologyGwangju 61005South Korea Smart Photonics Research Center/Advanced Optical Lens Research Center/Laser Research Center Korea Photonics Technology InstituteGwangju 61007South Korea

A new radiation-hard germano-silicate glass optical fiber with a pure silica glass buffer and a boron-doped silica glass inner cladding was fabricated for temperature sensor application based on the fiber bragg grating(FBG)underg-ray irradiation *** temperature dependences of optical attenuation at 1550.5 nm and bragg reflection wavelength shift from 18℃to 40℃before theγ-ray irradiation were about 4.57´10^(-4)dB/℃and 5.48 pm/℃,*** radiation-induced optical attenuation at 1550.5 nm and the radiation-induced bragg reflection wavelength shift under theγ-ray irradiation with the total dose of 22.85 kGy at 35℃were about 0.03 dB/m and 0.12 nm,respectively,with theγ-ray irradiation sensitivity of 5.25´10^(-3)pm/*** temperature and theγ-ray irradiation dependence of optical attenuation at 1550.5 nm in the FBG written fiber with boron-doped silica glass inner cladding were about 6 times and 4 times lower than that in the FBG written fiber without boron-doped silica glass inner cladding under a temperature change from 18℃to 40℃and theγ-ray irradiation with the total dose of 22.85 kGy at 35℃,***,the effect of temperature increase on the bragg reflection wavelength of the FBG written fiber with boron-doped silica inner cladding was much larger about 1000 times than that of theγ-ray ***,no influence on the reflection power of the bragg wavelengths and the full width at half maximum(FWHM)bandwidth under temperature and theγ-ray irradiation change was ***,after theγ-ray irradiation with the dose of 22.85 kGy,no significant change in the refractive index was found but the residual stresses developed in the fiber were slightly relaxed or retained.

关键词： Optical fiber radiation resistance temperature sensor fiber bragg grating radiation-induced attenuation

Research on the Surface Subsidence Monitoring Technology Based on fiber bragg grating Sensing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonic Sensors 2017年第1期7卷 20-26页

作者： Jinyu WANG Long JIANG Zengrong SUN Binxin HU Faxiang ZHANG Guangdong SONG Tongyu LIU Junfeng QI Longping ZHANG Key Laboratory of Optical fiber Sensing Technology of Shandong Province Laser Institute of Shandong Academy ofScience Jinan 250014 China Shandong Micro-Sensor Photomcs Ltd Jinan 250014 China Shandong Shenglong Safe Technology Co. Ltd Jinan 250032 China Laiwu Mining Co. Ltd of Laiwu Steel Group Laiwu 271100 China

In order to monitor the process of surface subsidence caused by mining in real time, we reported two types of fiber bragg grating （FBG） based sensors. The principles of the FBG-based displacement sensor and the FBG-based micro-seismic sensor were described. The surface subsidence monitoring system based on the FBG sensing technology was designed. Some factual application of using these FBG-based sensors for subsidence monitoring in iron mines was presented.

关键词： fiber bragg grating rock mass displacement micro-seismic optical fiber sensing surface subsidence

Development of High Temperature Acoustic Emission Sensing System Using fiber bragg grating

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonic Sensors 2018年第1期8卷 56-62页

作者： Dandan PANG Qingmei SUI Ming WANG Dongmei GUO Yaozhang SAI School of Information and Electrical Engineering Shandong Jianzhu University Jinan 250101 China Shandong Provincial Key Laboratory of Intelligent Buildings Technology Jinan 250101 China School of Control Science and Engineering Shandong University Jinan 250061 China

In some applications in structural health monitoring （SHM）, the acoustic emission （AE） detection technology is used in the high temperature environment. In this paper, a high-temperature-resistant AE sensing system is developed based on the fiber bragg grating （FBG） sensor. A novel high temperature FBG AE sensor is designed With a high signal-to-noise ratio （SNR） compared with the traditional FBG AE sensor. The output responses of the designed sensors with different sensing fiber lengths also are investigated both theoretically and experimentally. Excellent AE detection results are obtained using the proposed FBG AE sensing system over a temperature range from 25℃ to 200℃. The experimental results indicate that this FBG AE sensing system can well meet the application requirement in AE detecting areas at high temperature.

关键词： Optical sensor high temperature fiber bragg grating acoustic emission

Spectra Power and Bandwidth of fiber bragg grating Under Influence of Gradient Strain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonic Sensors 2016年第4期6卷 333-338页

作者： Qinpeng LIU Xueguang QIAO Zhen'an JIA Haiwei FU Key Laboratory on Photoelectric Oil-Gas Logging and Detecting (Ministry of Education) Xi'an Shiyou University Xi'an 710065 China

The reflective spectrum power and the bandwidth of the fiber bragg grating （FBG） under gradient strain are researched and experimentally demonstrated. The gradient strain is applied on the FBG, which can induce FBG bandwidth broadening, resulting in the variation of reflective power. Based on the coupled-mode theory and transfer matrix method, the segmental linear relationship between the gradient strain, the reflective power, and the bandwidth is simulated and analyzed, and the influence of the FBG length on the reflective spectrum is analyzed. In the experiment, the strict gradient stain device is designed; the experimental results indicate that the reflective optic power and the bandwidth of the FBG under gradient stain are concerned with the length of the FBG. Experimental results are well consistent with the theoretical analysis, which have important guiding significance in the FBG dynamic sensing.

关键词： fiber bragg grating gradient strain reflective spectrum power reflective spectrum bandwidth

Research on One-Piece Structure Target Flow Sensing Technology Based on fiber bragg grating

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonic Sensors 2016年第4期6卷 303-311页

作者： Chuntong LIU Zhengyi ZHANG Hongcai LI Zhenxin HE Xiaofeng ZHAO Rongjing WU Department Two Rocket Force University of Engineering Xi 'an 710025 China

In view of problems existing in the detection of the traditional hydraulic system, such as the large volume of sensor and the low measurement accuracy, a new one-piece target type flow sensor is designed and researched based on fiber bragg grating （FBG）. A compact structure is designed, which is convenient to be dismantled, processed, and installed, based on the analysis of the principle of FBG and the structure of target type flow sensor. The force of target put in fluid flow is turned into the FBG wavelength drift, with a corresponding relationship. The problem on the cross sensitivities of the temperature and strain is solved effectively by using double FBG symmetrically pasted on the both surfaces of the cantilever. The impact on the fluid state is analyzed through simulation in the software FLUENT, and the results show that the impact was smaller than that of the traditional structure. The results of experiments in the hydraulic system show that there is a good linear relationship between the change in the dual FBG central wavelength and mass loading on the target sheet has a good linear relationship, and the sensitivity is twice that of a single FBG sensitivity.

关键词： fiber bragg grating flow sensor target type structure equal intensity cantilever beam

Numerical investigation and optimal design of fiber bragg grating based wind pressure sensor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2017年第3期11卷 286-292页

作者： Xiangjie WANG Danhui DAN Rong XIAO Xingfei YAN Department of Bridge Engineering Tongji University Shanghai 200092 China Shanghai Municipal Engineering Design Institute (Group) Co. Ltd. Shanghai 200092 China Shanghai Urban Construction Design Research Institute Shanghai 200125 China

A wind pressure sensor based on fiber bragg grating （FBG） for engineering structure was investigated in this paper. We established a transaction model of wind pressure to strain and proposed a method of temperature compensation. By finite element analysis, the basic parameters of the sensor were optimized with the aim of maximum strain under the basic wind pressure proposed in relative design code in China taking geometrical non-linearity into consideration. The result shows that the wind pressure sensor we proposed is well performed and have good sensing properties, which means it is a technically feasible solution.

关键词： wind pressure measurement wind pressure sensor fiber bragg grating optimal design