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Analysis on strain transfer of fiber optic Fabry-Perot sensors-based on FEM method

World Forum on Smart Materials and Smart structures Technology, SMSST 07

作者： Zhang, Wentao Dai, Jingyun Sun, Baochen Du, Yanliang Key Lab. of Structure Health Monitoring and Control ofHebei Province Shijiazhuang Railway Institute Shijiazhuang Hebei China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing China

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Analysis on a novel reflective intensity modulated fiber optic temperature sensor

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World Forum on Smart Materials and Smart structures Technology, SMSST 07

作者： Dai, Jingyun Zhang, Wentao Sun, Baochen Du, Yanliang Key Lab. of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Railway Institute Shijiazhuang Hebei China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing China

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A novel fiber-mercury temperature sensor

A novel fiber-mercury temperature sensor

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Fundamental Problems of Optoelectronics and Microelectronics III

作者： Zhang, Wentao Dai, Jingyun Sun, Baochen Du, Yanliang Key Lab. of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Railway Institute Shijiazhuang Hebei 050043 State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing 100083

ISBN: (纸本)0819467278

Fiber optic sensors are widely used in structure monitoring and smart materials to measure the temperature. In this paper, a novel fiber-mercury temperature sensor (FMTS) is designed and tested. The sensor is made using the surface of the mercury to act as the reflector. The intensity of the reflective light is the function of the distance between the surface of the mercury and the fiber end, which is determined by the thermal extension of the mercury. And different length of the mercury in the capillary defines different sensitivity of the sensor. The modulation function of the sensor is analyzed. Experiment was carried out to evaluate the performance of the sensor, and the results present a good correlation between the theoretical and experimental result.

关键词： Temperature sensors

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FBG sensor network in Qinghai-Tibet railway

FBG sensor network in Qinghai-Tibet railway

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Network Architectures, Management, and Applications V

作者： Zhang, Wentao Dai, Jingyun Sun, Baochen Du, Yanliang Key Lab. of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Railway Institute Shijiazhuang Hebei 050043 State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing 100083

ISBN: (纸本)9780819469472

In this paper, fiber Bragg grating (FBG) sensors network in the subgrade temperature monitoring system in Qinghai-Tibet railway is presented. The principle of the FBG temperature sensor is introduced and the feasibility of the FBG sensors in the permafrost regions of Qinghai-Tibet plateau is analyzed. The FBG sensor network architecture is introduced. This sensor network includes the sensor chains embedded in the roadbed, slave optical cables, work stations including the FBG sensor interrogator and the optical router, master optical cables, and center workstation. We give the primary experimental result of this sensor network in monitoring the roadbed temperature of the railway at DK0985+000 near Chumar River. Fifteen FBG temperature sensors were embedded into the roadbed monitoring hole. The temperature data was collected after a month when the temperature field in the monitoring hole is stable. The result of the experiment shows that the FBG temperature sensors have an accuracy of 0.1 centigrade. Furthermore, the experimental result shows the stability and reliability of the FBG sensor network in the harsh environment of Qinghai-Tibet plateau. In the end, the conclusion is drawn and the prospect of the FBG sensor network in monitoring other parameters in the Qinghai-Tibet plateau is also presented.

关键词： Optical sensors

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Experiment on dynamic response of fiber optic Fabry-Perot sensors and its application in structural health monitoring

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World Forum on Smart Materials and Smart structures Technology, SMSST 07

作者： Zhang, Wentao Dai, Jingyun Sun, Baochen Du, Yanliang Key Lab. of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Railway Institute Shijiazhuang Hebei China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing China

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A novel fiber optic concrete sensor based on EFPI

A novel fiber optic concrete sensor based on EFPI

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International Conference on Smart Materials and Nanotechnology in Engineering

作者： Zhang, Wentao Dai, Jingyun Sun, Baochen Du, Yanliang Key Lab. of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Railway Institute Shijiazhuang Hebei 050043 China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing 100083

ISBN: (纸本)9780819465368

In this paper, a novel fiber optic concrete sensor based on extrinsic fiber Fabry-Perot interferometer (EFPI) is designed and analyzed. Two fiber ends are inserted into a glass capillary and encapsulated into a cement cylinder to act as the sensor head. In this way, the cement cylinder itself is the sensor head instead of the traditional steel tube, which makes it very convenient to embed the sensor head into the concrete, because the cement consists with the concrete well. Based on the theory of white light interferometry and the theory of elasticity, the wavelength modulation method and the strain transfer are analyzed theoretically. The demodulation system is also introduced in this paper. The experiment being made by our research group is aimed at testing the consistency, stability, reliability and the sensitivity of the fiber optic sensor. The sensor head of the cement cylinder is embedded into a model ferroconcrete beam together with traditional strain gauges. The experiment is carried out using the PEM-500A hydraulic pulsation fatigue test machine after 2 million stress circles. The readout of the fibre optic sensor and the strain gauges is recorded and made a contrast. It can be found from the result that the fibre optic sensors have good stability and reliability, the accuracy for the fibre optic sensor is better than 0.5 micro-strain, which shows that the sensor can meet the demand of the long-term monitoring of large-size concrete structure.

关键词： Fiber optic sensors

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Distributed feedback fiber laser rosette for acoustic emission detection

Distributed feedback fiber laser rosette for acoustic emissi...

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2nd International Conference on Materials Engineering and Automatic control, ICMEAC 2013

作者： Huang, Wen Zhu Zhang, Wen Tao Ma, Huai Xiang Li, Fang Du, Yan Liang School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang China Optoelectronic System Laboratory Institute of Semiconductors Chinese Academy of Sciences Beijing China Key Lab. of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Tiedao University Shijiazhuang China

ISBN: (纸本)9783037857250

This study aims at providing a practical method in large structure health monitoring. A novel fiber optic rosette based on distributed feedback (DFB) fiber laser for acoustic emission (AE) detection and location is presented. The ultra-narrow line width of the DFB fiber laser will result in high resolution in AE wave detection using a fiber optic interferometric demodulation method. The directivity of the fiber optic rosette is investigated. A rosette with three DFB fiber lasers is tested in the experiment to determine the direction of propagation of AE waves. © (2013) Trans Tech Publications, Switzerland.

关键词： Fiber lasers

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structure crack monitoring based on long-gauge FBG sensor 2nd

Structure crack monitoring based on long-gauge FBG sensor

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2nd International Conference of Structural health monitoring and Integrity Management, ICSHMIM 2014

作者： Zhang, Wentao Li, Fang Lin, Huang Ce, Bian Xu, Hongbin Du, Yanliang Optoelectronic System Laboratory Institute of Semiconductors Chinese Academy of Sciences Beijing China Graduate School of Shijiazhuang Tiedao University Shijiazhuang China Key Lab of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Tiedao University Shijiazhuang China

ISBN: (纸本)9781138027763

Crack detection is very important for long-term large-scale structural health monitoring (SHM). Fiber optic sensor has been approved to have good performance in application in SHM. In this paper, we present a novel method to monitor the crack by using long-gauge FBG sensor. A FBG with a gauge length of 50 mm is fabricated. When the crack pass through the FBG, the reflect spectrum of FBG will be expanded or chipped. Different position of the crack will result in different shape of the spectrum. By analyzing the characteristics of the spectrum, the position of the crack can be detected and the opening width of the crack can be estimated. © 2015 Taylor & Francis Group, London.

关键词： Structural health monitoring

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structure Crack monitoring Based on Long-gauge FBG Sensor

Structure Crack Monitoring Based on Long-gauge FBG Sensor

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The 2nd International Conference on Structural health monitoring and Integrity Management(第二届国际结构健康监测与完整性管理会议)

作者： ZHANG Wen-tao BIAN Ce HUANG Lin XU Hong-bin DU Yan-liang LI Fang Optoelectronic System Laboratory Institute of SemiconductorsChinese Academy of SciencesBeijingChina Key Lab.of Structure Health Monitoring and Control of Hebei ProvinceShijiazhuang Tiedao UniversityShijiazhuangChina Graduate School of Shijiazhuang Tiedao UniversityShijiazhuangChina

Crack detection is very important for long-term large-scale structural health monitoring(SHM).Fiber optic sensor has been approved to have good performance in application in *** this paper,we present a novel method to monitoring the crack by using long-gauge FBG sensor.A FBG with a gauge length of 50 mm is *** the crack pass through the FBG,the reflect spectrum of FBG will be expanded or *** position of the crack will result in different Shape of the *** analyzing the characteristics of the spectrum,the position of the crack can be detected and the opening width of the crack can be estimated.

关键词： Fiber Bragg Grating crack detection sensitivity resolution

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Experimental research on wind load distribution of four-center-circle coal shed

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Gongcheng Lixue/Engineering Mechanics 2017年 34卷 59-62页

作者： Wang, Xiao-Jiang Zheng, Yun-Fei Liu, Qing-Kuan Liu, Xiao-Bing Ma, Wen-Yong School Of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China Health Monitoring and Control Institute Shijiazhuang Tiedao University Shijiazhuang050043 China HeBei Province Key Lab of Structure Health Monitoring and Control Shijiazhuang050043 China

According to the requirements of engineering design and experimental research, the wind tunnel tests on a large-span coal shed structure for a thermal power plant were carried out. The influence of wind direction angle on wind-load-shape coefficient was studied. After analyzing the shape coefficient of each measuring point under different working conditions, the wind-load-shape coefficients on the structure surface were obtained. The results showed that: the measuring point had the largest volume coefficient when the angle between the measuring point and the incoming wind was among 30 ~ 40 degree;at different wind direction angles, the coefficients at the top and the edge areas of the model were relatively large, therefore, these areas should be strengthened when building a coal shed. © 2017, Engineering Mechanics Press. All right reserved.

关键词： Coal

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