Sensing Properties of Fused Silica Single-Mode Optical Fibers Based on PPP-BOTDA in High-Temperature Fields

Shen, Jiahui; Li, Ting; Zhu, Hong; Yang, Caiqian; Zhang, Kai

doi:10.3390/s19225021

Cited by 7 publications

(4 citation statements)

References 32 publications

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“…But when large deformation occurs, for example, an abscission layer forms, the test signal weakens until the fiber sensor breaks, and the signal cannot be tested. At present, Brillouin optical time domain reflectometry (BOTDR), Brillouin optical time domain analysis (BOTDA), Brillouin optical frequency domain analysis (BOFDA), and other testing instruments are widely used in the field of rock and soil deformation monitoring, and their strain measurement range is ±15000 με [24]. The Brillouin back-scattering signal of the BOTDR instrument is very weak, so it is easy to miss the signal when the rock breaks and an abscission layer forms in the model test.…”

Section: Discussionmentioning

confidence: 99%

A DOFS-Based Approach to Calculate the Height of Water-Flowing Fractured Zone in Overlying Strata under Mining

Piao

Wang

et al. 2021

Geofluids

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The distributed optical fiber sensing (DOFS) is a technique that can obtain full spatial and temporal information concerning the behavior of a large range of measurand fields along a fiber path and realize the distributed monitoring of the overburden section under mining. To calculate the height of water-flowing fractured zone caused by the exploitation of coal, this study employed distributed optical fiber sensors with OSI-C-S optical frequency domain reflectometry (OFDR) technology and designed a similar-material model test based on the engineering geological conditions of Daliuta Coal Mine. Through the test, deformation characteristics of overlying strata were studied, the linear relationship was summarized between the strain gradient and the shear stress measured by fiber sensors when the rock layer cracks, and a method was proposed of using the measured strain to measure the height of the water-flowing fractured zone in overlying strata. The test results show that there are several locations where the sign of the shear stress changes (positive to negative or vice versa) in the overlying strata during the initial stage of coal seam mining. As the working face advanced, the change locations gradually concentrated at the place where the rock cracks. By identifying the breakpoints of the rock and the locations where the sign of the shear stress measured by fiber sensors changes, this paper calculated the height of the water-flowing fractured zone in Daliuta Coal Mine. After comparing the height with the abscission layer position in the model test and the predicted height by the empirical formulas in the specification, it has been found that the three results are basically consistent, which in turn verifies the accuracy of this method.

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Section: Discussionmentioning

confidence: 99%

A DOFS-Based Approach to Calculate the Height of Water-Flowing Fractured Zone in Overlying Strata under Mining

Piao

Wang

et al. 2021

Geofluids

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“…Distributed optical fiber sensing (DOFS) systems are widely used for fire warning in railroad tunnels, temperature monitoring of power transmission lines, and health monitoring of oil and gas pipelines [ 7 , 168 , 169 , 170 ]. Unlike complex point sensor arrays, DOFS systems require only a single fiber to achieve distributed temperature measurements.…”

Section: Distributed Sensingmentioning

confidence: 99%

Optical Fiber Sensors for High-Temperature Monitoring: A Review

Pang

et al. 2022

Sensors

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High-temperature measurements above 1000 °C are critical in harsh environments such as aerospace, metallurgy, fossil fuel, and power production. Fiber-optic high-temperature sensors are gradually replacing traditional electronic sensors due to their small size, resistance to electromagnetic interference, remote detection, multiplexing, and distributed measurement advantages. This paper reviews the sensing principle, structural design, and temperature measurement performance of fiber-optic high-temperature sensors, as well as recent significant progress in the transition of sensing solutions from glass to crystal fiber. Finally, future prospects and challenges in developing fiber-optic high-temperature sensors are also discussed.

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“…Different coating materials result in different temperature resistance characteristics of optical fibers. Table 3 shows the specific performance comparison of optical fibers coated with different coating materials [31]: The fiber coated with heat-resistant silica gel and acrylic resin can be used in a small temperature range. As the coating layer of optical fiber, metal material can work under a high temperature environment, but the fabrication of grating on such optical fiber requires quite complex process, and the optical power will also suffer a large loss in the transmission process.…”

Section: Fiber Coating Selectionmentioning

confidence: 99%

A High Temperature Solid Pressure Sensor Based on Fiber Bragg Grating

et al. 2021

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For the requirement of pressure detection in high temperature environments, this paper presents a fiber Bragg grating (FBG) based pressure sensor with a simple structure. The structural model of the sensor has been established with the consideration of a sensing principle and a small deflection effect of the circular membrane. The finite element analysis has been employed to validate the rationality of the sensor structure design and realize the digital simulation of the theoretical model. Through the analysis, the selection of packaging materials, the design of structural parameters and the pressure and temperature calibration of the developed sensor has been performed. The encapsulation of the sensor at high temperatures has been improved based on the theoretical analysis, simulation and testing, which proves the effectiveness of the sensor for pressure measurement at high temperatures of 100 °C~250 °C. The study provides a feasible sensing device for high-temperature pressure detection.

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Sensing Properties of Fused Silica Single-Mode Optical Fibers Based on PPP-BOTDA in High-Temperature Fields

Cited by 7 publications

References 32 publications

A DOFS-Based Approach to Calculate the Height of Water-Flowing Fractured Zone in Overlying Strata under Mining

A DOFS-Based Approach to Calculate the Height of Water-Flowing Fractured Zone in Overlying Strata under Mining

Optical Fiber Sensors for High-Temperature Monitoring: A Review

A High Temperature Solid Pressure Sensor Based on Fiber Bragg Grating

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