DFOS Applications to Geo-Engineering Monitoring

Shi, Bin; Zhang, Dan; Zhu, Hong‐Hu; Zhang, Chengcheng; Gu, Kai; Sang, Hanfei; Han, Heming; Sun, Mengya; Liu, Jie

doi:10.1007/s13320-021-0620-y

Cited by 36 publications

(13 citation statements)

References 74 publications

(83 reference statements)

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“…( 2), K is the thermal conductivity which is related to the nature of matter itself; and ∂T ∂n n 0 is the temperature gradient. The thermal energy used to heat the fiber [17], [22] may be expressed as:…”

Section: Measurement Principle and Structure A Principle Of All-fiber...mentioning

confidence: 99%

“…A polymer-coated Fiber Bragg Grating (FBG) sensor has been used for relative humidity sensing [16], but the fabrication of this polymer coating structure is relatively complex and the resulting sensor characteristics are difficult to control. A distributed optical fiber sensor for this type of measurement has been proposed in 2021 by Shi et al -however, an external power supply is also required for this measurement device [17] which can be problematic for its use in some remote locations.…”

Section: Introductionmentioning

confidence: 99%

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Rapid Response All-Fiber Moisture Sensor

Wang,

et al. 2022

IEEE Sensors J.

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Combining the benefits of photothermal conversion in a doped optical fiber with the principle of Fiber Bragg Grating (FBG)-based temperature measurement, a new optical fiber method for the measurement of moisture content has been developed and its performance is reported. This novel all-fiber approach shows the important characteristics of fast response, miniaturization in the design and low power consumption. In this work, a 1480nm pump laser has been used to heat the cobalt-doped fiber used, which has been embedded in the sample under investigation, where the sensor temperature change was obtained by using a FBG written into the cobalt-doped fiber. The fast, in-situ measurement of moisture content developed takes advantage of the linear relationship between the temperature change characteristics experienced during the heating process and the moisture content. To calibrate and characterize the sensor developed, a variable moisture-content test platform was established, and experiments were conducted to investigate the performance of this optical fiber approach. The all-fiber moisture sensor developed in this way has been evaluated by measuring the moisture content of samples of soil and pulverized coal and the data obtained were in good agreement with the results obtained from using the more conventional (and slow) drying method, with a maximum error of just over 1% and a rapid, 2s, optimum measurement time achieved.

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Section: Measurement Principle and Structure A Principle Of All-fiber...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rapid Response All-Fiber Moisture Sensor

Wang,

et al. 2022

IEEE Sensors J.

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“…Gao et al [17,18] applied OFDR technology to measure the strain of PCC pile. Jiang et al [19] used the OFDR technology to measure the strain of the pipeline. Kwon et al [20] used OFDR technology to monitor the stress of anchors of soil slope.…”

Section: Introductionmentioning

confidence: 99%

Field Test Study on Deformation Monitoring of Antifloating Anchor Using Optic Fiber Sensor

et al. 2022

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The antifloating anchors have been widely used in the antifloating problem of underground engineering recently. Due to the complexity of the anchor force in the geotechnical material and the limitations of traditional monitoring methods, it is impossible to grasp the deformation characteristics of the anchor comprehensively. The pullout test of the antifloating anchor on-site is carried out in this paper based on the housing construction project. The Optical Frequency Domain Reflectometry (OFDR) technology is used, the strain distributions are obtained, and the distribution law of axial force is analyzed. The test results show that the strain of the antifloating anchor gradually decreases when anchoring depth increases and eventually tends to zero. The anchoring section is divided into main stressed section and unstressed section. The results show that the OFDR technology can be used to effectively monitor the antifloating anchor in the pullout test; it will help to grasp the deformation of antifloating anchor.

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“…Since the beginning of the new century, major safety accidents such as the collapse of large-scale underground diaphragm wall bridges and the rupture of bridge decks have occurred frequently all over the world, posing a great threat to the safety of people's lives and property [7]. Therefore, if the status of the underground diaphragm wall bridge structure can be monitored in a timely manner and the damage can be identified, processed, and even repaired in time, the safety of the underground diaphragm wall bridge structure can be greatly improved, and many disasters can be avoided and has very important practical significance and application value [8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Slope Sliding on the Stability of Underground Diaphragm Wall Bridge Foundation Based on Wireless Sensor Network

Wang

Zhao

2022

Journal of Sensors

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Real-time monitoring, condition assessment, early warning processing, and damage identification of underground diaphragm wall bridge structures are the current research trends. Based on the wireless sensor network theory, this paper constructs the stability model of the slope sliding on the underground diaphragm wall bridge foundation. The model builds a complete set of underground diaphragm wall bridge vibration signal acquisition and monitoring platform through wireless sensor network node data acquisition and solves the problem of data accuracy measurement by using theoretical analysis, software and hardware design, software simulation, and experimental verification methods. During the simulation process, experiments were designed such as slope sliding vibration signal acquisition data accuracy test, sensor node wireless charging power test and modeling, lithium battery charging power test and modeling, wireless rechargeable sensor node system work test, and other experiments. The experimental results show that the accuracy of the collected vibration signals of the underground diaphragm wall bridge is high, the main working frequency bands are 868 MHz, 915 MHz, and 2.4 GHz, the maximum data transmission rate is 250 Kbps, and the communication distance reaches 100 m, which can meet the requirements of the underground diaphragm wall. The power of wireless charging of lithium batteries reaches 4.5 mW, which effectively improves the stability measurement accuracy of underground diaphragm wall bridge foundations.

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DFOS Applications to Geo-Engineering Monitoring

Cited by 36 publications

References 74 publications

Rapid Response All-Fiber Moisture Sensor

Rapid Response All-Fiber Moisture Sensor

Field Test Study on Deformation Monitoring of Antifloating Anchor Using Optic Fiber Sensor

Analysis of the Influence of Slope Sliding on the Stability of Underground Diaphragm Wall Bridge Foundation Based on Wireless Sensor Network

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