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Monitoring shear deformation of sliding zone via fiber Bragg grating and particle image velocimetry
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作者 Deyang Wang Honghu Zhu +3 位作者 Guyu Zhou Wenzhao Yu Baojun Wang Wanhuan Zhou 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第1期231-241,共11页
Monitoring shear deformation of sliding zones is of great significance for understanding the landslide evolution mechanism,in which fiber optic strain sensing has shown great potential.However,the cor-relation between... Monitoring shear deformation of sliding zones is of great significance for understanding the landslide evolution mechanism,in which fiber optic strain sensing has shown great potential.However,the cor-relation between strain measurements of quasi-distributed fiber Bragg grating(FBG)sensing arrays and shear displacements of surrounding soil remains elusive.In this study,a direct shear model test was conducted to simulate the shear deformation of sliding zones,in which the soil internal deformation was captured using FBG strain sensors and the soil surface deformation was measured by particle image velocimetry(PIV).The test results show that there were two main slip surfaces and two secondary ones,developing a spindle-shaped shear band in the soil.The formation of the shear band was successfully captured by FBG sensors.A sinusoidal model was proposed to describe the fiber optic cable deformation behavior.On this basis,the shear displacements and shear band widths were calculated by using strain measurements.This work provides important insight into the deduction of soil shear deformation using soil-embedded FBG strain sensors. 展开更多
关键词 LANDSLIDE Shear band fiber bragg grating(fbg) Particle image velocimetry(PIV) Sinusoidal model Strain‒displacement proportional COEFFICIENT
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Determination of the Postmortem Interval Using Fiber Bragg Grating Sensors
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作者 M.Adjailia H.Derbal Habak +1 位作者 Y.Hamaizi H.Triki 《Fluid Dynamics & Materials Processing》 EI 2023年第3期831-844,共14页
Fiber Bragg grating(FBG)sensors are often used in monitoring activities and to ensure that environmental parameters satisfy industrial requirements.They offer crucial safety measures in the early detection of hazards ... Fiber Bragg grating(FBG)sensors are often used in monitoring activities and to ensure that environmental parameters satisfy industrial requirements.They offer crucial safety measures in the early detection of hazards due to their greatly reduced size,low weight,flexibility,and immunity to electromagnetic interference.These characteristics make FBGs suitable also for use in relation to the human body for in vivo measurements and long-term monitoring.In 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 PMI.First,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 dating.The results and their accuracy are discussed. 展开更多
关键词 fiber bragg grating temperature sensors Henssge’s nomogram post-mortem interval BIOMEDICINE
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Fiber Bragg Grating Sensor Array System Based on Digital Phase Generated Carrier Demodulation and Reference Compensation Method 被引量:2
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作者 Jun He Fang Li Hao Xiao Yu-Liang Liu 《Journal of Electronic Science and Technology of China》 2008年第4期389-392,共4页
A novel fiber Bragg grating (FBG) sensor array system based on digital phase generated carrier (PGC) demodulation and reference compensation method is proposed and set up. Experimental results confirm that the dig... A novel fiber Bragg grating (FBG) sensor array system based on digital phase generated carrier (PGC) demodulation and reference compensation method is proposed and set up. Experimental results confirm that the digital PGC demodulation can be used for wavelength-division-multiplexed FBG sensor array and the reference compensation method can reduce the environmental interference by approximately 40 dB in the frequency range from 20 Hz to 2 kHz. The minimum detectable wavelength-shift of the sensor system is 1 × 10^-3 pm/Hz^1/2. 展开更多
关键词 fiber bragg grating fbg sensor phase generated carrier (PGC) reference compensation method wavelength division multiplexing.
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Resistance Spot Welding Method for Metal-Based Fiber Bragg Grating Sensors 被引量:1
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作者 张涛 韦朋余 岳亚霖 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2015年第3期289-296,共8页
Aiming at the requirements of installation and work environment of metal-based fiber Bragg grating(FBG)sensor,a resistance spot welding method is presented.Firstly,the effect of welding parameters on welding quality i... Aiming at the requirements of installation and work environment of metal-based fiber Bragg grating(FBG)sensor,a resistance spot welding method is presented.Firstly,the effect of welding parameters on welding quality is discussed theoretically,and a suitable resistance spot welding method for the metal-based FBG sensor is proposed for the first time.Then through serial resistance spot welding tests,the feasibility and practicability of the method are verified,and optimal welding parameters for two different tested metals are obtained.Fatigue performance test validates FBG sensors installed by the proposed method with good fatigue properties and long-term stable measurement performance.The research results can provide technical guidance for engineering structure long-term safety monitoring. 展开更多
关键词 fiber bragg grating(fbg)sensor resistance SPOT wel
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Advances in femtosecond laser direct writing of fiber Bragg gratings in multicore fibers:technology,sensor and laser applications 被引量:2
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作者 Alexey Wolf Alexander Dostovalov +3 位作者 Kirill Bronnikov Mikhail Skvortsov Stefan Wabnitz Sergey Babin 《Opto-Electronic Advances》 SCIE EI 2022年第4期48-68,共21页
In this article,we review recent advances in the technology of writing fiber Bragg gratings(FBGs)in selected cores of multicore fibers(MCFs)by using femtosecond laser pulses.The writing technology of such a key elemen... In this article,we review recent advances in the technology of writing fiber Bragg gratings(FBGs)in selected cores of multicore fibers(MCFs)by using femtosecond laser pulses.The writing technology of such a key element as the FBG opens up wide opportunities for the creation of next generation fiber lasers and sensors based on MCFs.The advantages of the technology are shown by using the examples of 3D shape sensors,acoustic emission sensors with spatially multiplexed channels,as well as multicore fiber Raman lasers. 展开更多
关键词 multicore fiber fiber bragg grating femtosecond laser micromachining fiber laser fiber sensor
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Demodulation System for Fiber Bragg Grating Sensors Using Digital Filtering Technique 被引量:4
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作者 吕辰刚 胡志雄 +2 位作者 祖鹏 葛春风 武星 《Transactions of Tianjin University》 EI CAS 2008年第1期27-30,共4页
A discrimination measurement method and demodulation technique for fiber Bragg grating (FBG) sensors were presented using digital filtering technique. The system can control a tunable fiber Fabry-Perot filter with saw... A discrimination measurement method and demodulation technique for fiber Bragg grating (FBG) sensors were presented using digital filtering technique. The system can control a tunable fiber Fabry-Perot filter with sawtooth wave voltage generated by digital clock to interrogate FBG sensors. Using the analogue digital converter (ADC), the reflected FBG signals were sampled with synchronous digital clock. With the aid of digital matched filtering technique, the sampled FBG signals were processed to obtain the maximum signal-to-noise ratio (SNR) and the Bragg wavelength shift from the FBG signals was recovered. The results demonstrate that this system has a scanning range of 1 520 nm-1 575 nm,and the wavelength detection accuracy is less than 2 pm with 1.5 Hz scanning frequency. 展开更多
关键词 光学纤维束 解调 敏感器 数字滤波
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Packaging Effects on Fiber Bragg Grating Sensor Performance 被引量:1
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作者 HAO Jian-Zhong TAKAHASHI Shiro +4 位作者 CAI Zhao-Hui NG Jun Hong YANG Xiu-Feng CHEN Zhi-Hao LU Chao 《自动化学报》 EI CSCD 北大核心 2006年第6期999-1007,共9页
In this paper, the effects of packaging material and structure of fiber Bragg grating sensor performance are investigated. The effects of thermal expansion coefficient of different embedding materials on the temperatu... In this paper, the effects of packaging material and structure of fiber Bragg grating sensor performance are investigated. The effects of thermal expansion coefficient of different embedding materials on the temperature sensitivities of the FBG sensors are studied both theoretically and experimentally with good agreement, which provides a means for selection of FBG packaging material to achieve desired temperature sensitivity. We also demonstrate a 4-point bending structured FBG lateral force sensor that measures up to 242N force with well-preserved reflection spectrum, whereas for 3-point bending structure, multiple-peaks start to occur when applied force reaches 72N. 展开更多
关键词 fiber bragg grating sensor thermal expansion coefficient lateral force sensor
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Experimental Measurements of the Sensitivity of Fiber-optic Bragg Grating Sensors with a Soft Polymeric Coating under Mechanical Loading,Thermal and Magnetic under Cryogenic Conditions 被引量:2
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作者 关明智 王省哲 +2 位作者 辛灿杰 周又和 马力祯 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第1期140-144,共5页
The strain and temperature sensing performance of fiber-optic Bragg gratings (FBGs) with soft polymeric coating, which can be used to sense internal strain in superconducting coils, are evaluated under variable cryo... The strain and temperature sensing performance of fiber-optic Bragg gratings (FBGs) with soft polymeric coating, which can be used to sense internal strain in superconducting coils, are evaluated under variable cryogenic field and magnetic field. The response to a temperature and strain change of coated-soft polymeric FBGs is tested by comparing with those of coated-metal FBGs. The results indicate that the coated-soft polymeric FBGs can freely detect temperature and thermal strain, their At variable magnetic field, the tested results indicate accuracy and repeatability are also discussed in detail. that the cross-coupling effects of FBGs with different matrixes are not negligible to measure electromagnetic strain during fast excitation. The present results are expected to be able to provide basis measurements on the strain of pulsed superconducting magnet/cable (cable- around-conduit conductors, cable-in-conduit conductors), independently or utilized together with other strain measurement methods. 展开更多
关键词 fbg net Experimental Measurements of the Sensitivity of fiber-optic bragg grating sensors with a Soft Polymeric Coating under Mechanical Loading Thermal and Magnetic under Cryogenic Conditions
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Fiber Grating-Based Strain Sensor Array for Health Monitoring of Pipelines 被引量:1
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作者 Hui Wang Songyou Li +2 位作者 Lei Liang Gang Xu Bin Tu 《Structural Durability & Health Monitoring》 EI 2019年第4期347-359,共13页
Pipelines are one of the most important modern energy transportation methods,used especially for the transportation of certain dangerous energy media materials such as crude oil,natural gas,and chemical raw materials.... Pipelines are one of the most important modern energy transportation methods,used especially for the transportation of certain dangerous energy media materials such as crude oil,natural gas,and chemical raw materials.New requirements have been put forward for the health monitoring and early security warning of pipelines because of the large-scale and complicated development trend of the pipe network system.To achieve an accurate assessment of the health conditions of pipeline infrastructure,obtaining as many precise operating parameters as possible,particularly at some critical parts of the pipeline,is necessary.Therefore,a novel type of fiber grating strain sensor array is proposed herein to monitor the pipeline hoop strain.The sensor utilizes fiber grating characteristics such as light weight,corrosion resistance,remote transmission,and strong environmental adaptability.The fiber containing the grating measurement points is implanted into the composite material to complete the sensitization encapsulation and protection of the bare fiber grating.The design of the sensor array fulfills the requirements for monitoring pipeline mass data,making it easy to form a pipeline health monitoring sensor network.The sensor sensitivity is researched by using a combination of theoretical and experimental analysis.A sensitivity test,as well as linearity and stability tests,are performed on the sensor.The experimental results show that the average sensitivity of the sensor is 14.86 pm/με,and the error from the theoretical calculation analysis value is 8.75%.Due to its high reliability,good linear response and long-term stability,and the ability to reflect the exact strain change of the outer wall of the pipeline,the designed sensor can support longterm online pipeline monitoring.The fiber grating sensor array network has successfully realized the monitoring of the pipeline’s internal operation by using external strain changes.In addition to the performance benefits,there are other merits associated with the applicability of the sensor namely simple structure,compact size,manufacturing ease,and exterior installation ease. 展开更多
关键词 Strain sensor array fiber grating composite material monitoring pipeline
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Interrogating a Fiber Bragg Grating Vibration Sensor by Narrow Line Width Light 被引量:5
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作者 Jun Chang Dian-Heng Huo Liang-Zhu Ma Xiao-Hui Liu Tong-Yu Liu Chang Wang 《Journal of Electronic Science and Technology of China》 2008年第4期486-488,共3页
A method to interrogate fiber Bragg grating vibration sensor by narrow line width light is demonstrated. The interrogation scheme takes advantage of the intensity modulation of narrow spectral bandwidth light, such as... A method to interrogate fiber Bragg grating vibration sensor by narrow line width light is demonstrated. The interrogation scheme takes advantage of the intensity modulation of narrow spectral bandwidth light, such as distributed feedback laser, when a reflection or transmission spectrum curve of an fiber Bragg grating (FBG) moves due to the strain which is applied on the sensor. The sensor's response to accelerating frequency and amplitude is measured by experiment. The factors which have impacts on the sensitivity of the interrogation system are also discussed. 展开更多
关键词 fiber bragg grating fbg interrogation fiber bragg grating sensor optical fiber vibration sensor.
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Magneto-Optic Fiber Bragg Gratings with Application to High-Resolution Magnetic Field Sensors 被引量:4
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作者 Bao-Jian Wu Ying Yang Kun Qiu 《Journal of Electronic Science and Technology of China》 2008年第4期423-425,共3页
Magneto-optic fiber Bragg gratings (MFBG) based on magneto-optic materials have a lot of potential applications for sensing and optical signal processing. The transmission and reflection spectra of guided optical wa... Magneto-optic fiber Bragg gratings (MFBG) based on magneto-optic materials have a lot of potential applications for sensing and optical signal processing. The transmission and reflection spectra of guided optical waves in the MFBG are investigated. According to the sensitivity of MFBG spectral lines to the magneto-optic coupling intensity varying with applied magnetic field, a novel magnetic field sensor of high-resolution up to 0.01 nm/(kA/m) is predicted. 展开更多
关键词 Faraday effect fiber bragg grating magneto-optical sensor transmission spectra.
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Optical fiber Bragg grating sensors in smart structures
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《大连理工大学学报》 EI CAS CSCD 北大核心 1997年第S2期76-76,共1页
OpticalfiberBragggratingsensorsinsmartstructuresWeichongDu1,2,WJin2,SHLiu1(1HongKongPolytechnicUniv.2SouthCh... OpticalfiberBragggratingsensorsinsmartstructuresWeichongDu1,2,WJin2,SHLiu1(1HongKongPolytechnicUniv.2SouthChinaNormalUniv.)Op... 展开更多
关键词 SMART OPTICAL fiber grating sensorS bragg
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Time Division Multiplexing Fiber Bragg Grating Sensor System Using Composite Codes
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作者 曹瑶煜 徐弘萱 +3 位作者 张洋 朱雨霜 桂林 左健存 《Journal of Donghua University(English Edition)》 EI CAS 2019年第2期163-169,共7页
A novel multi-point sensing scheme to improve the signal-to-noise ratio(SNR),temperature measurement range of the fiber Bragg grating(FBG)sensors is proposed.The new sensing scheme adopted a composite coding technique... A novel multi-point sensing scheme to improve the signal-to-noise ratio(SNR),temperature measurement range of the fiber Bragg grating(FBG)sensors is proposed.The new sensing scheme adopted a composite coding technique based on Simplex codes and Golay codes and time division multiplexing technique to enhance the performance of the sensing system.Simulation results,in good agreement with the theory,confirmed that the maximum SNR enhancement of the sensor system employing composite coding based on 15-bit Simplex codes and 16-bit Golay codes was approximately 6.01 dB in comparison to the conventional single pulse case. 展开更多
关键词 fiber bragg grating(fbg) time division multiplexing(TDM) COMPOSITE CODING scheme CODING gain
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Characteristics of Smart Concrete with Fiber Optical Bragg Grating Sensor
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作者 信思金 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2004年第2期82-84,共3页
Based on the advantages of the fiber Bragg grating sensing technology,this paper presents a principle of a novel smart concrete with fiber optical Bragg grating sensor,analyses the theory and characteristics,illustrat... Based on the advantages of the fiber Bragg grating sensing technology,this paper presents a principle of a novel smart concrete with fiber optical Bragg grating sensor,analyses the theory and characteristics,illustrates the key technology and method to make the fiber Bragg grating sensor for the smart concrete,and proves the feasibility with experiments.The results indicate that the smart concrete with fiber Bragg grating sensors is feasible in the structure monitoring and damage diagnosing in the long run. 展开更多
关键词 smart concrete fiber optical bragg grating sensor intelligent materials
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Perimeter Security System Based on Ultra-Weak Fiber Bragg Grating Array
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作者 Zhihui Luo Hao Xiang +1 位作者 Yu Zhang Bing Xu 《Optics and Photonics Journal》 2022年第6期156-169,共14页
A perimeter security system based on ultra-weak fiber Bragg grating high-speed wavelength demodulation was proposed. The demodulation system for signal acquisition and high-speed wavelength calculation was designed ba... A perimeter security system based on ultra-weak fiber Bragg grating high-speed wavelength demodulation was proposed. The demodulation system for signal acquisition and high-speed wavelength calculation was designed based on field programmable gate array (FPGA) platform. The principle of ultra-weak fiber Bragg grating high-speed demodulation and signal recognition method were analyzed theoretically, and the Support Vector Machine model was introduced to optimize the event recognition accuracy of the system. A perimeter security experimental system containing 1000 ultra-weak fiber Bragg gratings, ultra-weak fiber Bragg grating sense optical cables with a diameter of 2.0 mm and a reflectivity of 0.01%, steel space frames and demodulation equipments was built to recognize four typical events such as knocking, shaking, wind blowing and rainfall. The experimental resulted show that the system has a spatial resolution of 1m and an acquisition frequency of 200 Hz. The joint time-frequency domain detection method is used to achieve 99.2% alarm accuracy, and 98% recognition accuracy of two intrusion events, which has good anti-interference performance. 展开更多
关键词 Perimeter Security Ultra-Weak fiber bragg grating Vibration sensor Pattern Recognition
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A Fiber-Optical Intrusion Alarm System Based on Quasi-Distributed Fiber Bragg Grating Sensors
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作者 Qi Jiang Yun-Jiang Rao De-Hong Zeng 《Journal of Electronic Science and Technology of China》 2008年第4期412-415,共4页
A fiber-optical intrusion alarm system based on quasi-distributed fiber Bragg grating (FBG) sensors is demonstrated in this paper. The algorithms of empirical mode decomposition (EMD) and wavelet packet characteri... A fiber-optical intrusion alarm system based on quasi-distributed fiber Bragg grating (FBG) sensors is demonstrated in this paper. The algorithms of empirical mode decomposition (EMD) and wavelet packet characteristic entropy are adopted to determine the intrusion location. The intrusion alarm software based on the Labview is developed, and it is also proved by the experiments. The results show that such a fiber-optical intrusion alarm system can offer the automatic intrusion alarm in real-time. 展开更多
关键词 Empirical mode decomposition fiber bragg grating sensor intrusion alarm system wavelet analysis.
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基于正弦式波纹膜片的压差式FBG静力水准仪
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作者 朱万旭 吴尧 +2 位作者 黄家柱 李梦果 刘丰荣 《传感器与微系统》 CSCD 北大核心 2024年第5期109-112,共4页
为解决建筑物不均匀沉降长期、可靠监测的问题,基于连通器原理,推导了膜片半径r、刚度K、光纤自由段长度l、波长变化量Δλ_(B)等参数和沉降量的线性关系式。以此设计了带有正弦式波纹膜片的压差式光纤布拉格光栅(FBG)静力水准仪,并通... 为解决建筑物不均匀沉降长期、可靠监测的问题,基于连通器原理,推导了膜片半径r、刚度K、光纤自由段长度l、波长变化量Δλ_(B)等参数和沉降量的线性关系式。以此设计了带有正弦式波纹膜片的压差式光纤布拉格光栅(FBG)静力水准仪,并通过标定试验验证压差式FBG静力水准仪的传感性能。结果表明:此静力水准仪灵敏度不小于13.2 pm/mm,综合误差不大于3.26%,相关性系数均在0.99以上。该型静力水准仪传感性能满足工程结构沉降测量的要求,丰富了FBG静力水准仪的研究,具有理论和现实意义。 展开更多
关键词 静力水准仪 光纤布拉格光栅 不均匀沉降 标定试验 传感器
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基于FBG的微小型三轴振动传感器研究
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作者 唐翔 吴俊 +2 位作者 黎琪慧 辛璟焘 董明利 《红外与激光工程》 EI CSCD 北大核心 2024年第2期197-205,共9页
为了研制一种微小型、三轴测量的高灵敏度振动传感器,提出一种分立元件交错组合的超紧凑光纤光栅三轴振动传感器设计方法。采用分立元件组合设计方法降低了设计加工难度,与一体化设计对比,分立元件组合结构的零件结构简单、易于加工、... 为了研制一种微小型、三轴测量的高灵敏度振动传感器,提出一种分立元件交错组合的超紧凑光纤光栅三轴振动传感器设计方法。采用分立元件组合设计方法降低了设计加工难度,与一体化设计对比,分立元件组合结构的零件结构简单、易于加工、结构设计也更为灵活,缩短了传感器结构的优化迭代周期。通过理论模型分析和有限元仿真,优化传感器结构参数,最终封装完成的尺寸为15 mm×15 mm×15 mm,质量约为24.26 g。最后进行实验测试和传感器性能分析。实验结果表明:该传感器的工作频段为0~1 200 Hz,在X、Y、Z轴方向的固有频率分别为1 850 Hz、1 770 Hz和1 860 Hz,三个轴向的灵敏度分别达到77.37 pm/g、80.73 pm/g和75.04 pm/g,横向抗干扰小于5%。该传感器满足航天振动测量轻量化、工作范围和灵敏度的应用需求,在遥感卫星微振动测量等领域具有重要应用前景。 展开更多
关键词 光纤布拉格光栅 三轴振动传感器 微型化 高灵敏度
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基于空间耦合传输方法的FBG传感器转子涡动测温误差及其影响因素研究
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作者 陈思彤 黄俊斌 +3 位作者 顾宏灿 姚高飞 徐丹 李哲宇 《光子学报》 EI CAS CSCD 北大核心 2024年第4期104-119,共16页
针对电机转子涡动对光纤光栅温度监测系统精度产生的影响,采用光纤光栅(FBG)的传输矩阵理论和自聚集透镜的耦合损耗理论,建立了涡动条件下FBG扫描光谱模型,结合相关试验,研究了扫描光谱的畸变规律及系统测温误差的影响因素。结果表明:... 针对电机转子涡动对光纤光栅温度监测系统精度产生的影响,采用光纤光栅(FBG)的传输矩阵理论和自聚集透镜的耦合损耗理论,建立了涡动条件下FBG扫描光谱模型,结合相关试验,研究了扫描光谱的畸变规律及系统测温误差的影响因素。结果表明:涡动导致扫描光谱反射峰发生偏移、3 dB带宽减小,通过协调涡动频率和解调仪扫描频率,使准直器间耦合损耗周期达到FBG光谱扫描时间的10倍以上(q>10)是保证较低测温误差的关键;同时,质心法对剧烈涡动条件下扫描光谱的寻峰效果明显优于高斯曲线拟合法。随着转子端面处的径向位移幅值或轴线偏角幅值的增大,系统的测温误差先缓慢地增大、后剧烈地增大;随着椭圆形轴心运动轨迹轴比的增大,测温误差先剧烈地增大、后缓慢地增大至稳定。当转子径向位移幅值小于200μm、轴线偏角幅值小于0.167°时,在轴比等于3、q值等于10条件下,15次采样试验反映出质心法和高斯曲线拟合法分别令系统的测温误差从2.9℃降低至0.6℃和1.1℃,为监测系统的应用与测温精度的预估提供了依据。 展开更多
关键词 光纤光栅温度传感器 转子温度监测系统 转子涡动 畸变光谱 测温误差
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Study on rock deformation monitoring using fiber Bragg grating in simulation experiment 被引量:4
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作者 柴敬 魏世明 刘金瑄 《Journal of Coal Science & Engineering(China)》 2006年第2期30-33,共4页
Presented the fiber Bragg grating(FBG)sensors for rock strain monitoring inthe 1.2 m long plane stress model of the simulation experiment.In the past,for the lack ofappropriate technique to measure the deformation of ... Presented the fiber Bragg grating(FBG)sensors for rock strain monitoring inthe 1.2 m long plane stress model of the simulation experiment.In the past,for the lack ofappropriate technique to measure the deformation of rock structures,the measurement ofdeflection was restricted to just a few discrete points along rock,and the measuring pointswere limited to the location installed with displacement transducers.We developed amethod to monitor the deformation of rock structures using fiber optical Bragg gratingstrain sensors.The sensors were embedded in rock layers of simulatioh experiment be-fore the materials were put in.These sensors were then used to monitor the experiencedstrain with different face advancing distance.The test results indicate that,if properly in-stalled,FBG sensors can survive under severe conditions associated with embedmentprocess and yield accurate measurements of strains response.At the same time,wemake com parisons of the data obtained by FBG sensors with those by centesimal gauge.The interest in FBG sensors was motivated by the potential advantages that they can offermore than existing sensing technologies. 展开更多
关键词 岩石应力 变形监测 模拟实验 纤维光学传感器 光纤bragg光栅传感器
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