A review of previous studies on the applications of fiber optic sensing technologies in geotechnical monitoring

Ma, Jun; Pei, Huafu; Zhu, Hong‐Hu; Shi, Bin; Yin, Jianhua

doi:10.1016/j.rockmb.2022.100021

Cited by 22 publications

(8 citation statements)

References 88 publications

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“…The distributed optical fiber sensing technology uses the optical signal transmitted in the optical fiber as the information transmission medium to detect the external physical quantities by modulating the phase, wavelength, intensity and other characteristics of the light. It has many advantages, such as distributed, easy deployment, long sensing distance, anti-interference and so on, and is widely used in many fields [5][6][7][8]. The distributed temperature sensing technology mainly includes temperature sensing based on Brillouin scattering and temperature sensing based on Raman scattering.…”

Section: Introductionmentioning

confidence: 99%

Automatic detection of the height of poured concrete via fiber-optic temperature sensing

LI,

YANG,

ZHU

et al. 2024

Preprint

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In the process of bridge foundation construction, the height of poured concrete cannot be measured automatically, which depends on manual operation and construction interruption. This paper proposes an automatic detection technology of the height of poured concrete via fiber-optic temperature sensing, which use the small temperature difference between concrete and air medium in the process of concrete pouring. The median filtering method is used to process the temperature position curve to obtain a signal curve similar to a step signal. The step functions with different periods are constructed, and the correlation coefficient curve is obtained by cross-correlation operation between the obtained temperature curve and the step functions with different periods. The variable step size search method is used to improve computational efficiency. Finally, the correlation coefficient curve is processed by peak seeking to realize the automatic discrimination of concrete level elevation. This technology has been successfully applied to the diaphragm wall project of Zhang-Jing-Gao Yangtze River Bridge. Limited by the spatial resolution of the temperature measurement system, the resolution of the liquid level elevation is ± 0.5m, and the automatic judgment of the liquid level elevation is consistent with the actual measurement results judged by the temperature nephogram, indicating that the algorithm has good accuracy, and the results of 30 operations at the same time are consistent, indicating that the algorithm has good stability.

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Section: Introductionmentioning

confidence: 99%

Automatic detection of the height of poured concrete via fiber-optic temperature sensing

LI,

YANG,

ZHU

et al. 2024

Preprint

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“…Most applications of FOS technologies are found in civil engineering. For instance, they have been widely used for dam health monitoring through the measurement of the deformation, stress, and leakage of dams [ 16 ]. Kronenberg et al [ 17 ] measured the deformation of a dam through a new design of deformation sensors installed inside concrete.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Fiber Bragg Grating Sensors for Monitoring Shaft Vibrations of Hydraulic Turbines

Sánchez-Botello

Roig

Torre

et al. 2023

Sensors

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The structural dynamic response of hydraulic turbines needs to be continuously monitored to predict incipient failures and avoid catastrophic breakdowns. Current methods based on traditional off-board vibration sensors mounted on fixed components do not permit inferring loads induced on rotating parts with enough accuracy. Therefore, the present paper assesses the performance of fiber Bragg grating sensors to measure the vibrations induced on a rotating shaft–disc assembly partially submerged in water resembling a hydraulic turbine rotor. An innovative mounting procedure for installing the sensors is developed and tested, which consists of machining a thin groove along a shaft line to embed a fiber-optic array that can pass through the bearings. At the top of the shaft, a rotary joint is used to extract, in real time, the signals to the interrogator. The shaft strain distribution is measured with high spatial resolution at different rotating speeds in air and water. From this, the natural frequencies, damping ratios, and their associated mode shapes are quantified at different operating conditions. Additionally, the change induced in the modes of vibration by the rotation effects is well captured. All in all, these results validate the suitability of this new fiber-optic technology for such applications and its overall better performance in terms of sensitivity and spatial resolution relative to traditional equipment. The next steps will consist of testing this new sensing technology in actual full-scale hydraulic turbines.

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“…Fiber optic sensors are devices that integrate sensing and transmission capabilities, and are widely used due to their high temperature resistance, [10] small size, resistance to electromagnetic interference, and distributed detection. [11] Fiber optic sensing technology has experienced rapid development recently and has been used to acquire vibration acceleration vector signals.…”

Section: Introductionmentioning

confidence: 99%

Vector fiber Bragg gratings accelerometer based on silicone compliant cylinder for low frequency vibration monitoring

Chen

You

et al. 2023

Chinese Phys. B

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Vector accelerometer has attracted much attention for its great application potential in underground seismic signal measurement. We propose and demonstrate a novel vector accelerometer based on three fiber Bragg gratings (FBGs) embedded in a silicone rubber compliant cylinder at 120° distributed uniformly. The accelerometer is capable of detecting the orientation of vibration with a range of 0° ~ 360° and the acceleration through monitoring the central wavelength shifts of three FBGs simultaneously. The experimental results show that the natural frequency of the accelerometer is about 85 Hz, and the sensitivity is 84.21 pm/g in the flat range of 20 ~ 60 Hz. Through experimental calibration, the designed accelerometer can accurately obtain vibration vector information, including vibration orientation and acceleration. In addition, the range of resonant frequency and sensitivity can be expanded by adjusting the hardness of the silicone rubber materials. Due to the characteristics of small size and orientation recognition, the accelerometer can be applied to low-frequency vibration acceleration vector measurement in narrow spaces.

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A review of previous studies on the applications of fiber optic sensing technologies in geotechnical monitoring

Cited by 22 publications

References 88 publications

Automatic detection of the height of poured concrete via fiber-optic temperature sensing

Automatic detection of the height of poured concrete via fiber-optic temperature sensing

Assessment of Fiber Bragg Grating Sensors for Monitoring Shaft Vibrations of Hydraulic Turbines

Vector fiber Bragg gratings accelerometer based on silicone compliant cylinder for low frequency vibration monitoring

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