Research on the Micro and High-Precision Fiber Bragg Grating Soil Pressure Sensor

Shanchao, 蒋善超 Jiang; Yuqiang, 曹玉强 Cao; Qingmei, 隋青美 Sui; Jing, 王静 Wang; Ning, 王宁 Wang; Zhengfang, 王正方 Wang

doi:10.3788/cjl201340.0405002

Cited by 3 publications

(2 citation statements)

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“…Grating sensors have the advantage of easy digital implementation, high accuracy (up to nanoscale), excellent interference resistance, easy installation, and good reliability. Since it is fully digitized, there are no manual reading errors [23][24][25]. Additionally, grating sensors provide a good technical means for monitoring stress and strain in geomechanical models on account of distributed measurement, real-time monitoring, and long-distance data transmission.…”

Section: Introductionmentioning

confidence: 99%

Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground Engineering

Gao

et al. 2023

Geofluids

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To clarify damage or degradation mechanisms of underground shock disturbance of deep caverns, a customized model of a deep cavern to subjected ground shock was employed to simulate the following properties and processes: crustal stress loading, cavern excavation, and ground-shock disturbance loading. The similar model specimen was a cube of 1.3 m length and a size similarity ratio of 1 : 50. A fiber Bragg grating (FBG) strain sensor with multipoint distributions was developed to monitor the distribution of internal strains in the model. Sensors were appropriately arranged and packaged in the similar model of deep rock to determine strain variation in the model under hydrostatic confining pressure, construction dynamic load, and shock dynamic load. This investigation involved high crustal stress simulation, tunnel boring machine (TBM) construction simulation, and deep explosive shock simulation, respectively. The results suggest that the sensors can accurately monitor the strain during the entire process comprising loading, excavation, and shock generation and obtain the distribution of cave strain during excavation and shock generation. The cave strain indicated that the left and right sides of the tunnel both experienced a rapid increase in tensile strain from the top plane shock wave, proportional to the shock force. The mechanism of surrounding rock failure and the occurrence of the V-shaped blasting pit were clarified. In the model test, the following phenomena related to deep tunnel failure were simulated: particle ejection, block collapse, slabbing, and tunnel face collapse. The oscillatory wave was also monitored with FBG sensors. The results demonstrated that FBG strain sensor had good repeatability and could accurately monitor strain change in the different blocks, thus demonstrating considerable potential for use in similar model tests. The model tests conducted in this study can provide important technical reference and support for the construction and protective design of deep caverns.

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Section: Introductionmentioning

confidence: 99%

Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground Engineering

Gao

et al. 2023

Geofluids

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“…Schetano et al developed a FBG sensor for dam water level by using 3D printing technology [28]. Various laboratory experimental tests and field applications have demonstrated the utility, efficiency and effectiveness of the FBG sensor in infrastructural development works and structure health monitoring systems [29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

A hybrid FBG-based load and vibration transducer with a 3D fused deposition modelling approach

Qin

et al. 2022

Meas. Sci. Technol.

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A fibre Bragg grating (FBG)-based load and vibration transducer (FLVT) was developed using a 3D fused deposition modelling (FDM) approach. A newly FLVT was designed by the equal-strength cantilever beam in which the FBG sensors were embedded in the beam during the FDM process. The temperature effect was eliminated by the temperature sensor in the vibration sensing unit. The parameters of the proposed FLVT was examined by the finite element method. The simulated results were matched well with the theoretical analysis results and laboratory calibration results. The proposed transducer has the pressure measurement sensitivity of 0.01274 nm/kPa for the earth pressure below 150 kPa. In addition, the proposed transducer could accurately measure low-frequency vibration signals with maximum frequency of 4 Hz and the maximum displacement amplitude of 4 mm with sensitivity of 117.6 pm/g. The measurement accuracy and stability were carried out. Results shown that the maximum relative errors between the calculation results and the experimental results was 1.3%. The effect of vibration direction was also analysed for the proposed FLVT. The results indicated that the transversal vibration has less influence on the longitudinal vibration. The outcome of this study indicated that the proposed FLVT provide a newly approach for the measurement of earth pressure and soil vibration in one transducer which is quit suit for soil mass.

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Development in Fiber Bragg Grating Sensing Technology

蒋¹

2018

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A V-band sub-harmonic mixer with an integrated frequency doubler and a 180 out-of-phase splitter using standard 0.13 lm CMOS technology is reported. The sub-harmonic mixer comprises a current-reused bleeding mixer, a baseband amplifier, a 180 (Wilkinsonpower-divider-based) out-of-phase splitter, and a frequency doubler. The mixer consumed 31.5 mW and achieved input return loss at RF port better than À10 dB for frequencies from 49.8 to 63 GHz. At IF of 20 MHz, the mixer achieved maximum conversion gain of 9.5 dB at RF of 53 GHz. The corresponding 3-dB bandwidth (x 3dB ) of RF is 9.6 GHz (48.4-58 GHz). The measured LO-to-RF and LO-to-IF isolation were better than 50 dB over the frequency band of interest. In addition, the measured input 1-dB compression point (P 1dB ) and input third-order intermodulation point were À8 dBm and 2.2 dBm, respectively, at RF of 60 GHz. These results demonstrate the proposed mixer architecture is very promising for high-performance V-band RFIC applications.

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Research on the Micro and High-Precision Fiber Bragg Grating Soil Pressure Sensor

Cited by 3 publications

References 0 publications

Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground Engineering

Application of Fiber Grating Sensing in Similar Model Impact Tests of Underground Engineering

A hybrid FBG-based load and vibration transducer with a 3D fused deposition modelling approach

Development in Fiber Bragg Grating Sensing Technology

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