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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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Strain-Insensitive Fiber Bragg Grating Composite Structure for Wide-Range Temperature Sensing
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作者 Pingyu Zhu Tingyu Huang +5 位作者 Sheng Fan Yukun Yan Bo Peng Danli Xiong Shuai Zhang Marcelo A.Soto 《Journal of Dynamics, Monitoring and Diagnostics》 2024年第3期199-206,共8页
This paper reports on the design,fabrication,and temperature strain sensing performance of a fiber Bragg grating composite structure for surface mounted temperature measurements over a wide temperature range,with high... This paper reports on the design,fabrication,and temperature strain sensing performance of a fiber Bragg grating composite structure for surface mounted temperature measurements over a wide temperature range,with highly reduced strain cross-sensitivity.The fiber Bragg grating sensor is encapsulated in a polyimide tube filled with epoxy resin,forming an arc-shaped cavity.This assembly is then placed between two layers of glass fiber prepreg with a flexible pad in between and cured into shape.Experimental results,supported by finite element simulations,demonstrate an enhanced temperature sensitivity is 26.3 pm/°C over a wide temperature range of–30°C to 70°C,and high strain transfer isolation of about 99.65%. 展开更多
关键词 composite structure fiber bragg grating temperature sensing
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Novel Apodized Fiber Bragg GratingApplied for Medical Sensors:Performance Investigation
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作者 Ramya Arumugam Ramamoorthy Kumar +3 位作者 Samiappan Dhanalakshmi Khin Wee Lai Lei Jiao Xiang Wu 《Computer Modeling in Engineering & Sciences》 SCIE EI 2023年第4期301-323,共23页
Sensors play an important role in shaping and monitoring human health.Exploration of methods to use Fiber Bragg Grating(FBG)with enhanced sensitivity has attracted great interest in the field of medical research.In th... Sensors play an important role in shaping and monitoring human health.Exploration of methods to use Fiber Bragg Grating(FBG)with enhanced sensitivity has attracted great interest in the field of medical research.In this paper,a novel apodization function is proposed and performance evaluation and optimization of the same have been made.A comparison was conducted between various existing apodization functions and the proposed one based on optical characteristics and sensor parameters.The results evince the implementation of the proposed apodization function for vital sign measurement.The optical characteristics considered for evaluation are Peak Resonance Reflectivity level,Side Lobes Reflectivity level and FullWidth HalfMaximum(FWHM).The proposed novel apodization novel function has better FWHM,which is narrower than the FWHM of uniform FBG.Sensor characteristics like a quality parameter,detection accuracy and sensitivity also show improvement.The proposed novel apodization function is demonstrated to have a better shift in wavelength in terms of temperature and pulse measurement than the existing functions.The sensitivity of the proposed apodized function is enhanced with a Poly-dimethylsiloxane coating of varying thickness,which is 6 times and 5.14 times greater than uniform Fiber Bragg grating and FBG with the proposed novel apodization function,respectively,enhancing its utilization in the field of medicine. 展开更多
关键词 fiber bragg grating APODIZATION optical sensing TEMPERATURE STRAIN sensitivity
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Encrypted optical fiber tag based on encoded fiber Bragg grating array
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作者 Zhihao Cai Bozhe Li +13 位作者 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 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2023年第3期658-665,共8页
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 ... 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 system.Traditional physical entity marking methods for fiber labeling are bulky,easily confused,and,most importantly,the label information can be accessed easily by all potential users.This 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 method.Gratings with different resonant wavelengths and reflectivities are realized by adjusting the grating period and the refractive index modulations.It 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 reflectivities.The proposed fiber tag technology can be used for applications in port identification,encrypted data storage,and transmission in fiber networks. 展开更多
关键词 fiber bragg grating femtosecond laser micromachining encrypted information optical fiber tag
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Critical dispersion of chirped fiber Bragg grating for eliminating time delay signature of distributed feedback laser chaos
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作者 王大铭 雷一航 +1 位作者 史鹏飞 李壮爱 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第9期237-241,共5页
Optical chaos has attracted widespread attention owing to its complex dynamic behaviors.However,the time delay signature(TDS)caused by the external cavity mode reduces the complexity of optical chaos.We propose and nu... Optical chaos has attracted widespread attention owing to its complex dynamic behaviors.However,the time delay signature(TDS)caused by the external cavity mode reduces the complexity of optical chaos.We propose and numerically demonstrate the critical dispersion of chirped fiber Bragg grating(CFBG)for eliminating the TDS of laser chaos in this work.The critical dispersion,as a function of relaxation frequency and bandwidth of the optical spectrum,is found through extensive dynamics simulations.It is shown that the TDS can be eliminated when the dispersion of CFBG is above this critical dispersion.In addition,the influence of dispersive feedback light and output light from a laser is investigated.These results provide important quantitative guidance for designing chaotic semiconductor lasers without TDS. 展开更多
关键词 CHAOS semiconductor laser time delay signature chirped fiber bragg grating(Cfbg)
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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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Multiwavelength Actively Mode-locked Fiber Laser with a Double-ring Configuration and Integrated Cascaded Sampled Fiber Bragg Gratings
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作者 LONG Xiao-bo YANG Jian-liang 《Semiconductor Photonics and Technology》 CAS 2008年第2期85-89,共5页
A modified multiwavelength actively mode-locked fiber ring laser is proposed and experimentally demonstrated. In this kind of laser, stable multiwavelengths lasing is achieved by integrating cascaded sampled fiber Bra... A modified multiwavelength actively mode-locked fiber ring laser is proposed and experimentally demonstrated. In this kind of laser, stable multiwavelengths lasing is achieved by integrating cascaded sampled fiber Bragg gratings(SFBGs) into the laser cavity. To implement actively mode-locking technique, a double-ring cavity configuration is used to assure that the cavity lengths for all wavelengths lasing are identical. Thus, simultaneous mode locking of all wavelengths has been successfully achieved by using the same mode-locking signal. 展开更多
关键词 sampled fiber bragg grating(Sfbg multiwavelength fiber laser MODE-LOCKING
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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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基于应变增敏的双层十字型FBG触觉感知单元
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作者 孙世政 何江 +2 位作者 秦鸿宇 徐向阳 陈仁祥 《光学精密工程》 EI CAS CSCD 北大核心 2024年第17期2718-2731,共14页
触觉感知是仿生智能感知的重要内容,为了提高光纤布拉格光栅(Fiber Bragg Grating, FBG)触觉感知灵敏度,结合机器手指尖触觉感知需求,提出了一种应变增敏的FBG触觉感知单元。基于应变增敏机理和触觉感知机理分析,设计了一种基于应变增... 触觉感知是仿生智能感知的重要内容,为了提高光纤布拉格光栅(Fiber Bragg Grating, FBG)触觉感知灵敏度,结合机器手指尖触觉感知需求,提出了一种应变增敏的FBG触觉感知单元。基于应变增敏机理和触觉感知机理分析,设计了一种基于应变增敏的双层十字型FBG触觉感知单元,采用刚性球型多点增压结构进行应变增敏。利用仿真分析方法优化了FBG空间分布,并对感知单元进行了静力学和热力学仿真。最后搭建了触觉感知实验平台,结合机器手完成了温度-力触觉协同感知实验。仿真和实验结果表明,FBG1和FBG2的力触觉感知灵敏度分别为18.069 nm/MPa和1.065 nm/MPa,温度感知灵敏度为11.256 pm/℃和11.153 pm/℃。该触觉感知单元有效提高了触觉感知灵敏度,具有良好的线性度和重复性。 展开更多
关键词 光纤传感 光纤布拉格光栅 应变增敏 双层十字型 触觉感知单元
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FBG传感器在起重机械局部损伤监测中的应用研究
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作者 尚歌 王雁飞 《传感技术学报》 CAS CSCD 北大核心 2024年第7期1285-1289,共5页
光纤布拉格光栅(Fiber Bragg Grating,FBG)传感器自身应变传递特性和敏感范围波动较大,在应用过程中缺少结合被测结构性能和FBG传感器本身结构特点的应用方法。为此,研究FBG传感器在起重机械局部损伤监测中的应用。根据起重机械的内部... 光纤布拉格光栅(Fiber Bragg Grating,FBG)传感器自身应变传递特性和敏感范围波动较大,在应用过程中缺少结合被测结构性能和FBG传感器本身结构特点的应用方法。为此,研究FBG传感器在起重机械局部损伤监测中的应用。根据起重机械的内部振动状况构建损伤模型,在FBG传感器光纤的同一位置放置两个不同的Bragg光栅,并根据波长变化采集局部损伤数据,将采集到的数据输入自回归滑动平均模型(Autoregressive Moving Average Model,ARMA)中,提取损伤状态,完成起重机械局部损伤监测。实验结果表明,所提方法的反馈时间低于0.25 ms,监测到的应变数据与实际应变数据差距相近,监测的损伤部位与设定损伤部位一致,证明该方法监测反馈效率和监测精度高,监测效果好,适用于各种环境下的起重机械局部监测工作。 展开更多
关键词 fbg传感器 局部损伤监测 bragg光栅 起重机械 ARMA模型 内部振动
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基于FBG传感器阵列反演结构振动位移的监测方法
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作者 黄新敬 程彤遥 +3 位作者 马金玉 张志鹏 黄漪 李健 《光通信技术》 北大核心 2024年第1期7-12,共6页
针对现有振动位移监测方法易受环境影响且精度不高的问题,提出了一种基于光纤布喇格光栅(FBG)传感器阵列反演结构振动位移的监测方法。该方法使用FBG传感器阵列获取结构振动过程中的多点应变和单点加速度数据,先利用基于正交曲率的曲线... 针对现有振动位移监测方法易受环境影响且精度不高的问题,提出了一种基于光纤布喇格光栅(FBG)传感器阵列反演结构振动位移的监测方法。该方法使用FBG传感器阵列获取结构振动过程中的多点应变和单点加速度数据,先利用基于正交曲率的曲线重构算法和获得的应变数据重构结构各点的动态位移,然后运用卡尔曼滤波算法将曲线重构算法导出的位移数据与同位置处的单点加速度数据相融合,获得更为准确的位移数据。实验结果表明:该方法可成功重构出监测结构任意时刻的振动形态,悬臂铝板和简支管道的振动位移重构相对均方根误差分别小于5.5%和7%。 展开更多
关键词 光纤布喇格光栅 振动监测 动态形变 位移 卡尔曼滤波
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Fabrication of arbitrarily apodized fiber Bragg gratings with narrow bandwidth
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作者 吕昌贵 恽斌峰 崔一平 《Journal of Southeast University(English Edition)》 EI CAS 2009年第1期23-25,共3页
A double-exposure fabrication method without any intensity shadow mask to fabricate arbitrarily apodized fiber Bragg gratings( FBGs) with narrow bandwidth is demonstrated by controlling the total ultra violet (UV)... A double-exposure fabrication method without any intensity shadow mask to fabricate arbitrarily apodized fiber Bragg gratings( FBGs) with narrow bandwidth is demonstrated by controlling the total ultra violet (UV) irradiation along the grating by varying the speed of a translation stage. The UV source used is a stable continuous intracavity frequency-doubled argonion laser. The parameters (such as length, apodization profile, average index change)of FBGs can be easily changed with this method. The total UV irradiation is kept constant in the doubleexposure process because of the precise control of the exposure time, which ensures that the apodized FBG's bandwidth can be extremely narrow. The full width at half maximum (FWHM) bandwidth of the 2-cm-long apodized FBG fabricated by this method is 0. 15 nm with a maximum reflectivity of more than 95%. 展开更多
关键词 fiber bragg grating APODIZATION double exposure
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基于多FBG组合传感的机械臂外部干扰应力监测系统
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作者 王春霞 刘云朋 《激光与红外》 CAS CSCD 北大核心 2024年第9期1485-1490,共6页
为了解决机械臂工作过程中外部应力干扰导致装配位置偏差的问题,设计了一种基于多光纤光栅传感器组合传感的监测系统。根据机械臂运动角度范围,仿真分析了在两个特征位置上不同方向外加应力后外机械臂与内机械臂的应力场分布特征。依据... 为了解决机械臂工作过程中外部应力干扰导致装配位置偏差的问题,设计了一种基于多光纤光栅传感器组合传感的监测系统。根据机械臂运动角度范围,仿真分析了在两个特征位置上不同方向外加应力后外机械臂与内机械臂的应力场分布特征。依据应力场分布特性,设计了多FBG的传感阵列,并计算了不同FBG响应与外部干扰应力的对应关系。实验采用16个FBG对FS-MP1C型小型机械的抓取过程进行在线监测,随机外部干扰应力设置为2~20 N。16个FBG的响应线性度均在0.99以上,正向和负向波长响应最大值分别为1354 pm和-984 pm。在100次分层干扰测试中,X与Y轴向干扰应力检出率优于80.0%,Z轴向干扰应力检出率优于97.5%。系统平均误检率低于4.0%。可见,本设计可以在线完成外部干扰应力的实时监测,具有一定的实用价值。 展开更多
关键词 光纤光栅 干扰监测 组合传感 机械臂控制
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基于FBG信号和DECE-PCA-BHOSVM的变压器绕组径向松动状态评估
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作者 许洪华 许自强 +1 位作者 李勇 尹来宾 《电气工程学报》 CSCD 北大核心 2024年第2期381-390,共10页
变压器作为电力系统的关键设备,其绕组松动状态的识别对电网的稳定运行具有重要意义。针对传统监测方法环境干扰较大、应用复杂等问题,提出了使用两类不同的布拉格光纤光栅(Fiber bragg grating,FBG)传感器采集变压器绕组关键测点温度... 变压器作为电力系统的关键设备,其绕组松动状态的识别对电网的稳定运行具有重要意义。针对传统监测方法环境干扰较大、应用复杂等问题,提出了使用两类不同的布拉格光纤光栅(Fiber bragg grating,FBG)传感器采集变压器绕组关键测点温度与应变信号,经快速解耦与自适应噪声完备集合经验模态分解后(Fast decoupling and complete ensemble empirical mode decomposition with adaptive noise,DECE),提取关键参数并进行主元分析(Principal component analysis,PCA)。对降维后的特征采用基于黑洞优化的支持向量机(Support vector machine based on black hole optimization,BHOSVM)进行分类,实现对变压器绕组径向松动状态的监测与定位。诊断结果表明,所提诊断方法对变压器绕组径向松动状态的识别准确率达到96.8%。 展开更多
关键词 布拉格光纤光栅 油浸变压器 支持向量机 黑洞优化算法
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基于FBG和F-P的温度和折射率双参量传感器
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作者 姚国珍 宗子天 +3 位作者 吴玉章 李炳峰 颜炳欣 尚秋峰 《半导体光电》 CAS 北大核心 2024年第3期349-355,共7页
提出了一种由单模布拉格光栅和多模Fabry-Perot腔级联而成的温度和折射率双参量传感器。对多模光纤的末端采用氢氟酸进行腐蚀,在腐蚀后形成的凹陷处填充紫外胶,从而形成Fabry-Perot腔。Fabry-Perot腔和单模光纤布拉格光栅级联后,构成最... 提出了一种由单模布拉格光栅和多模Fabry-Perot腔级联而成的温度和折射率双参量传感器。对多模光纤的末端采用氢氟酸进行腐蚀,在腐蚀后形成的凹陷处填充紫外胶,从而形成Fabry-Perot腔。Fabry-Perot腔和单模光纤布拉格光栅级联后,构成最终的传感结构。Fabry-Perot腔对温度和折射率敏感,而光纤布拉格光栅对温度敏感而对折射率不敏感。利用上述特性,采用灵敏度矩阵法可实现对温度和折射率的同时测量。实验结果表明,传感器的温度和折射率灵敏度分别为-0.4832nm/℃和-508.64pm/RIU。该传感器具有制作工艺简单、结构紧凑、成本低、灵敏度高的优点,有很好的应用前景。 展开更多
关键词 温度和折射率传感 Fabry-Perot腔 光纤布拉格光栅 多模光纤
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基于WOA-ELM的空间分层结构FBG三维振动加速度传感器非线性解耦
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作者 孙世政 武宇峰 +2 位作者 何江 徐向阳 陈仁祥 《仪器仪表学报》 EI CAS CSCD 北大核心 2024年第7期139-147,共9页
针对三维振动加速度传感器存在的维间耦合干扰问题,以空间分层结构光纤布拉格光栅(FBG)三维振动加速度传感器为研究对象,阐述了三维振动加速度传感的基本原理。其次,构建了振动加速度动态标定实验平台,并分析了传感器的结构耦合特性。最... 针对三维振动加速度传感器存在的维间耦合干扰问题,以空间分层结构光纤布拉格光栅(FBG)三维振动加速度传感器为研究对象,阐述了三维振动加速度传感的基本原理。其次,构建了振动加速度动态标定实验平台,并分析了传感器的结构耦合特性。最后,提出一种基于鲸鱼算法优化极限学习机(WOA-ELM)的神经网络模型并进行了非线性解耦实验,其结果显示,在x、y、z三轴的平均测量误差分别降至1.58%、1.17%、0.95%,平均I类和II类误差最大值分别降至0.73%和0.37%。为验证解耦效果,将WOA-ELM与其他算法等进行解耦效果对比。结果表明,WOA-ELM更有效地降低三维振动加速度传感器的维间耦合干扰,提高测量精度。 展开更多
关键词 光纤布拉格光栅 三维振动加速度传感器 维间耦合 鲸鱼优化算法 极限学习机
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利用FBG传感器测试高温合金和陶瓷基复合材料的应变
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作者 姜亚军 程丽琴 +3 位作者 刘小冲 赵菲 贺正泽 尹剑波 《物理实验》 2024年第10期22-26,共5页
利用光纤布拉格光栅(FBG)应变传感器测量了高温合金和陶瓷基复合材料的应变特性,并与电阻应变片的测量结果进行了对比分析.将FBG应变传感器与电阻应变片分别粘贴在高温合金和陶瓷基复合材料试件的正、反面上,利用力学试验机对2种试件施... 利用光纤布拉格光栅(FBG)应变传感器测量了高温合金和陶瓷基复合材料的应变特性,并与电阻应变片的测量结果进行了对比分析.将FBG应变传感器与电阻应变片分别粘贴在高温合金和陶瓷基复合材料试件的正、反面上,利用力学试验机对2种试件施加载荷,分别利用FBG解调仪和应变测试仪对FBG应变传感器和电阻应变片的信号进行实时解调.研究得出:FBG应变传感器与电阻应变片在一定的应变范围内,测量结果符合较好.因此,FBG应变传感器可代替电阻应变片,实现对材料的应变测量. 展开更多
关键词 应变 fbg 电阻应变片 高温合金 陶瓷基复合材料
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一种面向结构沉降的改进型FBG传感器
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作者 唐杰 邵国霞 《光通信技术》 北大核心 2024年第4期36-41,共6页
为了提高光纤布喇格光栅(FBG)型沉降传感器的灵敏度,降低在沉降过程中由于倾斜与温漂所造成的测量偏差,设计了一种面向结构沉降的改进型FBG传感器。该传感器将传统悬臂结构改为直拉结构,减少因沉降倾斜导致的测量误差;通过精确计算2组FB... 为了提高光纤布喇格光栅(FBG)型沉降传感器的灵敏度,降低在沉降过程中由于倾斜与温漂所造成的测量偏差,设计了一种面向结构沉降的改进型FBG传感器。该传感器将传统悬臂结构改为直拉结构,减少因沉降倾斜导致的测量误差;通过精确计算2组FBG的波长偏移量的比值,实现对沉降量的准确测量。测试结果表明:该传感器的应变响应量为5.2×10^(-5)ε/N,在0~50 mm内波长偏移量与沉降量成线性关系,其偏差均值优于0.69 mm,灵敏度均值为107.45 pm/mm;测试结果波动均低于1.0%,明显优于传统FBG传感器结构,验证了其具有更好的抗干扰能力。 展开更多
关键词 沉降检测 光纤布喇格光栅 差分比值计算 倾斜干扰 温漂干扰
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基于FBG的微小型三轴振动传感器研究 被引量:1
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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FBG(光纤光栅)监测技术的地铁盾构隧道环向变形研究 被引量:1
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作者 代兴云 穆保岗 陶津 《城市轨道交通研究》 北大核心 2024年第6期148-152,160,共6页
[目的]FBG(光纤光栅)监测技术具有动态响应快、抗干扰强、精度高、耐久性强等优点,能实现远距离实时监测,其反馈的环向变形监测数据对盾构掘进过程的参数调整有着重要意义,有必要基于光纤监测技术对管片环向变形规律进行深入研究。[方法... [目的]FBG(光纤光栅)监测技术具有动态响应快、抗干扰强、精度高、耐久性强等优点,能实现远距离实时监测,其反馈的环向变形监测数据对盾构掘进过程的参数调整有着重要意义,有必要基于光纤监测技术对管片环向变形规律进行深入研究。[方法]以某地铁隧道工程为例,采用光纤传感器对地铁隧道施工期管片进行实时监测。通过监测数据分析,研究管片施工环境中的环向应变变化规律,分析相对收敛位移与盾构掘进参数之间的相互关系。[结果及结论]监测数据表明,环向变形主要集中在管片安装之后的一周内和相邻隧道掘进的50 m范围内,当地层差且埋深小时,后掘进隧道对已施工管片收敛的影响程度为50%;当地层好且埋深大时,而后掘进隧道对已施工管片收敛的影响程度约为65%~83%。不同埋深时管片应变受土层及邻线隧道施工的影响较大,其中埋深小且土层差的管片变形变化大,埋深较大的管片约束性较好,变形变化不明显。相对收敛位移与盾构掘进参数存在明显的联系,盾构的总推力与管片的相对收敛位移存在负相关的关系,盾构的掘进速度与管片的相对收敛位移存在正相关的关系。采用FBG监测技术得到的实时监测数据,能作为盾构机掘进参数调整的依据。 展开更多
关键词 地铁隧道 光纤监测 环向变形 施工期
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