A FBG pull-wire vertical displacement sensor for health monitoring of medium-small span bridges

Li, Shengli; Zhang, Liang; Guo, Ping

doi:10.1016/j.measurement.2023.112613

Cited by 15 publications

(5 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…l1 and l2 are the lengths from the input and output ends to the fulcrum of rod 1, l3 and l4 are the lengths from the input and output ends to the fulcrum of rod 2, KM is the rotational stiffness of the circular hinge, and KF is the linear stiffness of the circular hinge. kf is the coefficient of elasticity of the optical fiber, which is represented by equation (5).…”

Section: Mechanical Model Of Lever Hingementioning

confidence: 99%

“…The non-contact measurement of vibrations in equipment is mainly based on electricity [1]- [2] , optics [3]- [5] and the three principles of magnetism, each showing its own unique advantages. Among these technologies, Eddy current sensors based on electrical principles have been favored by many researchers due to their high accuracy, wide response range and long service life, and are widely used in the field of vibration measurement.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Research on a non-contact magnetically coupled vibration sensor of fiber grating

deng,

hong

2024

International Conference on Optoelectronic Information and Functional Materials (OIFM 2024)

View full text Add to dashboard Cite

Real-time monitoring of vibration status is essential to ensure the safe operation of major and precision mechanical equipment. However, vibration sensors based on traditional electromagnetic signal principles are often difficult to withstand harsh environments, and signal transmission can be unstable. In view of this, a non-contact magnetically coupled vibration sensor based on Fiber Bragg Grating (FBG) technology was developed. The sensor adopts a new design, combines the classic permanent magnet and diaphragm, and introduces a lever hinge structure, and proposes a sensing mechanism connected to the diaphragm and the lever hinge, and realizes the amplification effect of displacement through the lever action. The working principle of the sensor is described in detail, simulation analysis is carried out, and its performance is verified by experiments. After relevant experiments, it is obtained: (1) amplitude range: 1.0mm-2.2mm (2) sensitivity: −83pm/mm (3) linear fitting correlation coefficient: 0.97 (4) working frequency band: 0-3400Hz (5) resonant frequency: 3750Hz. Such sensors show great potential for fault detection and health monitoring in large-scale precision machinery.

show abstract

Section: Mechanical Model Of Lever Hingementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on a non-contact magnetically coupled vibration sensor of fiber grating

deng,

hong

2024

International Conference on Optoelectronic Information and Functional Materials (OIFM 2024)

View full text Add to dashboard Cite

show abstract

“…In addition, since the reflected wavelength of FBG is related to changes in external physical * Author to whom any correspondence should be addressed. quantities such as temperature [4], strain [5] and displacement [6], it is also commonly used in fiber optic sensing and shows excellent performance [7]. In particular, compared to a homogeneous optical waveguide, the refractive index of an FBG varies periodically along the axial direction, which gives it a dramatic phase shift at the resonant wavelength, and thus makes it one of the ways to achieve the slow light phenomenon [8].…”

Section: Introductionmentioning

confidence: 99%

All-optical modulation of Fano-like resonances in apodized fiber Bragg grating using Er/Yb doped fiber

Wang,

Lin,

et al. 2024

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

A novel all-optical scheme for fast modulation of Fano-like resonance using Er/Yb doped fiber (EYDF) is proposed and demonstrated experimentally. In the integrated system, an apodized fiber Bragg grating (AFBG) is inserted into one arm of the fiber Mach-Zehnder interferometer (MZI), and the asymmetric Fano-like resonances is generated by the interference between the MZI mode and AFBG mode. In addition, a section of EYDF is inserted into the other arm of the MZI to control the phase difference between the two arms of the MZI. By adjusting the power of optical pump applied to the EYDF, the transmission spectrum lineshapes of the integrated device can be effectively modulated into asymmetric Fano-like resonances, symmetric transmission dip or electromagnetically induced transparency (EIT)-like resonances, which has a fast response speed. The proposed all-optical Fano-like modulation scheme is simple in structure, and has advantages of remote control and long-term stability, providing potential applications in the fields of fast and slow light, optical filters and fiber sensing.

show abstract

“…Conventional methods for slope deformation monitoring employ various instruments, including pull‐wire displacement monitoring sensors, global positioning system (GPS), interferometric synthetic aperture radar (InSAR), and total stations. While pull‐wire displacement monitoring sensors offer high accuracy in one‐dimensional displacement monitoring, their installation process is complex and labor‐intensive (S. Li et al., 2023; Lv et al., 2019). GPS‐based methods can monitor slope deformation in three dimensions, but their accuracy in areas with weak GPS signals is uncertain (Benoit et al., 2015; Y. Li et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

A multi‐degree‐of‐freedom monitoring method for slope displacement based on stereo vision

Wang,

Peng,

et al. 2024

Computer aided Civil Eng

View full text Add to dashboard Cite

Three‐dimensional displacement monitoring over long distances has been a long‐standing concern in the structural health monitoring industry. In this study, a multi‐degree‐of‐freedom slope displacement monitoring method is developed by fusing computer vision and the 3D point triangulation method. Attributed to this method, the problems of outdoor binocular camera calibration, multi‐target mismatching, and outdoor illumination effects were solved. First, a two‐stage camera calibration method is proposed to accurately calibrate intrinsic and extrinsic camera parameters under a large field of view and long working distance conditions. Second, the adaptive spatial‐frequency method is proposed to calculate the coding and pixel coordinates of the monitored target. In this step, to solve the problem of mismatching monitored points in different camera frames, the Augmented Reality University of Cordoba code is introduced to provide a unique identity code for each monitored point. To mitigate the impact of illumination and other factors on pixel coordinate calculation, an adaptive pixel coordinate calculation method that combines information from the spatial and frequency domains is proposed., Third, based on the intrinsic and extrinsic parameters of the stereo camera and the pixel coordinates of the monitored points, the 3D coordinates of the monitored points are obtained through triangulation. Finally, the accuracy experiments and stability experiments are conducted. According to the results of the experiments, the measurement distance is positively correlated with the measurement error. And the baseline length is negatively correlated with the measurement error in the z‐direction. Ultimately, we suggest that the ratio of baseline length to measurement distance should be greater than 40%. When the recommended value is satisfied, the measurement error is less than 1 mm when the measurement distance is less than 40 m. When the measurement distance is equal to 90 m, the measurement error is less than 5 mm. Meanwhile, stability experiments of the algorithm were carried out, and in a period of outdoor validation experiments, the fluctuations were only sub‐millimeter, demonstrating good anti‐interference performance. Moreover, the method proposed in this study successfully monitored a landslide disaster in Guangxi, which demonstrated its outstanding practical application capabilities.

show abstract

A FBG pull-wire vertical displacement sensor for health monitoring of medium-small span bridges

Cited by 15 publications

References 39 publications

Research on a non-contact magnetically coupled vibration sensor of fiber grating

Research on a non-contact magnetically coupled vibration sensor of fiber grating

All-optical modulation of Fano-like resonances in apodized fiber Bragg grating using Er/Yb doped fiber

A multi‐degree‐of‐freedom monitoring method for slope displacement based on stereo vision

Contact Info

Product

Resources

About