High Precision, Small Size and Flexible FBG Strain Sensor for Slope Model Monitoring

Xu, Huiying; Zheng, Xinyu; Zhao, Weigang; Sun, Xu; Li, Feng; Du, Yanliang; Liu, Bo; Gao, Yang

doi:10.3390/s19122716

Cited by 13 publications

(11 citation statements)

References 15 publications

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“…The lower part is mainly composed of a cardan plate and a steering shaft. As shown in Figure 1, the components of the sensor are listed as follows: (1) venturi, (2) sliding connection, (3) eccentric wheel, (4) washer, (5) closed push rod, (6) displacement conduction shaft, (7) displacement top shaft, (8) strain grating, (9) wire, (10) nut, (11) steering shaft, (12) simple beam, (13) support frame, (14) frame base, (15) rolling bearing, (16) coding plate of shaft sleeve, (17) water turbine, (18) lever, (19) universal plate, (20) coding plate of shaft sleeve and (21) optical fiber Grating.…”

Section: Sensor Structurementioning

confidence: 99%

“…Therefore, future sensor processing should improve the smoothness of the necking section in the venturi. According to the analysis of experimental error sources, the test accuracy is affected by the following factors: insufficient lubrication of the eccentric wheel and closed push rod, the machining accuracy of the sensor’s overall structure, the strength of the metal wire, and the pasting technology and pretension setting of the FBGs [ 15 , 16 ]. …”

Section: Conclusion and Prospectmentioning

confidence: 99%

“…In recent years, Fiber Bragg Grating (FBG) has been gradually used as a measuring element of various sensors because of its advantages such as being not easily interfered with by the external electromagnetic environment [ 12 , 13 ], high measurement accuracy [ 14 , 15 ], small volume, good wavelength selectivity [ 16 ], and not being affected by nonlinear effects. However, considering the fiber Bragg grating sensing technology, most scholars still study the flow velocity monitoring of directional fluid [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Flow Velocity and Direction Monitoring Sensor Based on Fiber Bragg Grating

Zhang

Zhong

Duan

et al. 2021

Sensors

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The real-time monitoring of the flow environment parameters, such as flow velocity and direction, helps to accurately analyze the effect of water scour and provide technical support for the maintenance of pier and abutment foundations in water. Based on the principle of the Fiber Brag Grating sensor, a sensor for monitoring the flow velocity and direction in real-time is designed in this paper. Meanwhile, the theoretical calculation formulas of flow velocity and direction are derived. The structural performance of the sensor is simulated and analyzed by finite element analysis. The performance requirements of different parts of the sensor are clarified. After a sample of the sensor is manufactured, calibration experiments are conducted to verify the function and test the accuracy of the sensor, and the experimental error is analyzed. The experimental results indicate that the sensor designed in this paper achieves a high accuracy for the flow with a flow velocity of 0.05–5 m/s and the flow velocity monitoring error is kept within 7%, while the flow direction monitoring error is kept within 2°. The sensor can meet the actual monitoring requirements of the structures in water and provide reliable data sources for water scour analysis.

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Section: Sensor Structurementioning

confidence: 99%

Section: Conclusion and Prospectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design of Flow Velocity and Direction Monitoring Sensor Based on Fiber Bragg Grating

Zhang

Zhong

Duan

et al. 2021

Sensors

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show abstract

“…The bare FBG sensor is fragile and usually needs to be fixed on a specific carrier [36][37][38]. Wang et al [4] proposed a detection device combining FBG and PVC pipe, Xu et al [39] proposed a soft FBG strain sensor composed of rubber strip, FBG, and steel plate. This method reflects landslide deformation through carrier deformation, so the fixed carrier often affects it.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Measuring Device and Method of Underground Displacement Based on Double Mutual Inductance Voltage Contour Method

Shentu

Wang

et al. 2022

Sensors

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Landslide is a very common and destructive geo-hazard, and displacement monitoring of it is integral for risk assessment and engineering prevention. Given the shortcomings of current landslide displacement monitor technologies, a new three-dimensional underground displacement monitoring technology is proposed based on the double mutual inductance voltage contour method. The underground displacement measuring device mainly consists of an information processing unit and sensing array, connected by power and RS-485 communication lines. An underground displacement measurement model to convert the double mutual inductance voltages and the inter-axis angle into the relative displacement between adjacent sensing units is established based on the interval-interpolation and contour-modeling. Under the control of the information processing unit, the relative displacement between any two adjacent sensing units can be calculated through the underground displacement measurement model, so as to obtain the total displacement from underground depth to surface, and the measurement data can be further sent to the Internet of things cloud platform through the 4G module; thus the remote real-time monitoring of underground displacement three-dimensional measurement for the rock and soil mass from underground depth to the surface is realized. The measurement model is verified by building an experimental platform to simulate the underground displacement of rock and soil mass. The experimental results show that for each measuring unit, when the horizontal displacement and vertical displacement are within the measurement range of 0–50 mm, the maximum measurement error will not exceed 1 mm, which can meet the accuracy requirements of underground displacement monitoring of landslide.

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“…As the voltage of HSR can reach thousands or even tens of thousands of volts, traditional piezoelectric vibration sensors are potentially subjected to great electromagnetic interference. Fiber optic sensing technology [38] takes light waves as a carrier and fiber as a medium, which has the advantages of anti-electromagnetic interference, corrosion resistance, long-distance transmissibility, strong multiplexing, and networking ability, and thus meeting the needs of on-site monitoring of rail track. The partners of the authors in this paper have developed interferometric fiber optic accelerometers for vibration measurement [39].…”

Section: Introductionmentioning

confidence: 99%

Application Study on Fiber Optic Monitoring and Identification of CRTS-II-Slab Ballastless Track Debonding on Viaduct

Guo

Wang

et al. 2021

Applied Sciences

Self Cite

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China Railway Track System (CRTS)-II-slab ballastless track is a new type of track structure, and its interlayer connection state is considerably important for the operation safety and ride comfort of high-speed trains. However, the location and multiple influencing factors of interlayer debonding lead to difficulties in monitoring and identification. Here, the research on the design and application of a monitoring scheme that facilitates interlayer debonding detection of ballastless track and an effective indicator for debonding identification and assessment is proposed. The results show that on-site monitoring can effectively capture the vibration signals caused by train vibration and interlayer debonding. The features of the data acquired in the situations with and without interlayer debonding are compared after instantaneous baseline validation. Some significant features capable of obviously differentiating a debonding state from the normal state are identified. Furthermore, a new indicator, combining multiple debonding-sensitive features by similarity-based weights normalizing the initial difference between mutual instantaneous baselines, is developed to support rational and comprehensive assessment quantitatively. The contribution of this study includes the development and application of an interlay-debonding monitoring scheme, the establishment of an effective-feature pool, and the proposal of the similarity-based indicator, thereby laying a good foundation for debonding identification of ballastless track.

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High Precision, Small Size and Flexible FBG Strain Sensor for Slope Model Monitoring

Cited by 13 publications

References 15 publications

Design of Flow Velocity and Direction Monitoring Sensor Based on Fiber Bragg Grating

Design of Flow Velocity and Direction Monitoring Sensor Based on Fiber Bragg Grating

Three-Dimensional Measuring Device and Method of Underground Displacement Based on Double Mutual Inductance Voltage Contour Method

Application Study on Fiber Optic Monitoring and Identification of CRTS-II-Slab Ballastless Track Debonding on Viaduct

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