Fiber Bragg grating sensor-based monitoring strategy for slope deformation in centrifugal model test

Guo, Yongxing; Fu, Jianjun; Li, Longqi; Li, Xiong

doi:10.1108/sr-10-2017-0218

Cited by 13 publications

(8 citation statements)

References 17 publications

(16 reference statements)

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“…The vibration sensor based on FBG sensing technology features high sensitivity, low transmission loss, strong electromagnetic immunity, etc. 1 , 2 . Multiplexing FBG sensors such as acceleration, temperature, displacement, pressure, pH, humidity and magnetic field in the same optical fiber can overcome the need to use multiple sensors and heavy cables in traditional electrical sensors, as well as the shortcomings of weak anti-interference capability 3 – 5 .…”

Section: Introductionmentioning

confidence: 99%

A new L-shaped rigid beam FBG acceleration sensor

Teng

Wang

Tang

et al. 2022

Sci Rep

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Acceleration detection is an important technology in the fields of seismic monitoring, structural health monitoring and resource exploration. A FBG acceleration sensor with the combination of L-shaped rigid beam and spring structure based on bearings is proposed against the low sensitivity that predominates in the low-frequency vibration measurement by FBG acceleration sensors, where L-shaped rigid beam is utilized to amplify the vibration signal, and is fixed by the bearings at both ends to effectively suppress the transverse crosstalk. The effects of structural parameters on the sensitivity and natural frequency of the sensors were analyzed using Origin theory, and such parameters were optimized; next, static stress and modal simulation analysis was made using COMSOL; in the end, a test system was built to test the performance of the real sensors. According to the findings, the acceleration sensor, whose natural frequency is 57 Hz, is of a flat sensitivity response in the low frequency range of 1–35 Hz, with the dynamic range being 89.83 dB, the acceleration sensitivity being up to 1241.85 pm/g, the coefficient of determination R2 for the sensitivity fit is 0.9997, and the transverse crosstalk being -26.20 dB within the operating frequency band. The findings offer a reference for improving the low-frequency vibration measurement capability of FBG acceleration sensors.

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Section: Introductionmentioning

confidence: 99%

A new L-shaped rigid beam FBG acceleration sensor

Teng

Wang

Tang

et al. 2022

Sci Rep

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“…The measurement of low-frequency vibration signals below 50 Hz is a very important work in the fields of seismic monitoring, structural health monitoring of large- and medium-sized engineering projects and resource exploration (Goto et al , 2019; Guo et al , 2019). Traditional electronic sensors are widely used in the field of vibration acceleration measurement.…”

Section: Introductionmentioning

confidence: 99%

A new type low-frequency FBG acceleration sensor based on cross reeds

Wang

Qiu

et al. 2022

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Purpose The purpose of this paper is to solve the problem of weak low-frequency vibration measurement capability of FBG accelerometer, and propose a FBG accelerometer based on cross reed. Design/methodology/approach This study proposed a new type FBG acceleration sensor based on cross reeds. When the sensor vibrates, the mass block in the new structure rotates around the center of the cross reeds, which could eliminate the impact of friction, reduce the natural frequency of the sensor and improve its sensitivity. This study theoretically analyzed the impact of several structural parameters on the sensitivity and natural frequency of the proposed sensor and used COMSOL to perform static stress analysis and modal simulation; in this study, a test system was built to test the performance of the proposed sensor. Findings The test results revealed that the proposed sensor had a natural frequency of 94 Hz; within a low-frequency range of 1–65 Hz, its sensitivity response was flat, the dynamic range was 81.89 dB, the sensitivity was 243.59 pm/g and the linearity was 99.97%. The cross reeds effectively strengthened the structural stability, the relative standard deviation of the repeatability of the sensor was 0.89% and the transverse crosstalk in the working frequency band was −26.97 dB. Originality/value This study innovatively proposes the structure of the two symmetrical cross reeds, which can improve sensitivity by eliminating the influence of friction, and the structure of cross reeds can effectively suppress the influence of lateral crosstalk. The proposed sensor can realize real-time accurate measurement of low-frequency weak vibration signals.

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“…Fiber Bragg grating (FBG) is a special sensitive element of OFS and promises new advantages such as wavelength coding without interference from power fluctuation of the light source, and the potential for multiple FBGs to be arrayed into a single fiber. Thus, FBGs have been applied to many commercial and engineering applications including slope deformation [3], [4], structural engineering [5], [6], bridge [7], and railway [8] in the past two decades.…”

Section: Introductionmentioning

confidence: 99%

A Fiber Bragg Grating Anchor Rod Force Sensor for Accurate Anchoring Force Measuring

Fu¹,

Guo

Li³

2020

IEEE Access

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This paper presents a novel anchor rod force sensor based on fiber Bragg grating (FBG) for accurate anchoring force measurement. A special FBG strain sensor with enhanced sensitivity has been designed and embedded in the centre line of an elastic structural body, which forms the main body of the anchor rod force sensor. The mechanical structure design and measuring principle of the proposed anchor rod force sensor have been presented detailedly. Then a sensor prototype has been manufactured and fully tested. The experimental results show that the sensor provides a sensitivity of 11.58 pm/kN with a fitting linear correlation coefficient of 0.9996 in a measurement range of 50 kN, a repeatability error of 3.26%, and a hysteresis error of 3.87%. Furthermore, good resistance to bending effects of anchor rod, good creep resistance (fluctuant value is within 2 pm), and good temperature compensation capacity (maximum value is 11 pm) have also been verified. These results promise the sensor better applicability in the health monitoring of large civil engineering structures.

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Fiber Bragg grating sensor-based monitoring strategy for slope deformation in centrifugal model test

Cited by 13 publications

References 17 publications

A new L-shaped rigid beam FBG acceleration sensor

A new L-shaped rigid beam FBG acceleration sensor

A new type low-frequency FBG acceleration sensor based on cross reeds

A Fiber Bragg Grating Anchor Rod Force Sensor for Accurate Anchoring Force Measuring

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