The fiber Bragg grating (FBG) strain sensors were used for on-line monitoring of the stress variation of the lined wall in the gateway retained along the goaf of No. …

This work reviews the present and emerging trends in CFBG sensors, focusing on all aspects of the sensing element and outlining the application case scenarios for which CFBG sensors have been demonstrated. 1. Introduction. Within the broad field of fiber optic sensors [1], Fiber Bragg Grating (FBG) sensors are emerging as a prominent …

Fbg Sensor For Coal Mind Application Mining Machinery FBG strain sensors reflects the changes in the strain of the concrete wall. A group of micro-seismic data are illustrated in the aspect of energy, length of time of the signal, and frequency. The results show the FBG sensors can be used in coal mines for coal mines safety.

This paper briefly introduces the sensing principles of FBG and ultra-weak FBG (UWFBG) technologies for landslide monitoring. A series of FBG-based sensors and their developed methods for ...

This letter presents an improved fiber Bragg grating (FBG) displacement sensor for long-range measurements. A mechanical transfer structure is designed and developed, which converts the displacement of a measurement wire to the elastic deflection of a sensing arm. The wavelength shift difference between two FBGs symmetrically …

One of the essential parts of a wind power generator that captures wind energy is the wind turbine blade. The safety of the blades rapidly declines as a wind turbine's operating period grows. For real-time monitoring, a chip-type pre-stressed fiber Bragg grating (FBG) strain sensor was fabricated. The sensor's structure was …

The FBG sensor is an all-fiber passive device, which is a functional fiber sensor with FBG as a sensitive element. This type of sensor can be well adapted to the complex environment of coal mines …

Research Article Application of a FBG-Based Instrumented Rock Bolt in a TBM-Excavated Coal Mine Roadway Bin Tang,1,2,3 Hua Cheng,1 Yongzhi Tang,4 Zhishu Yao,1 Chuanxin Rong,1 Weipei Xue,1,3,5 and Jian Lin1 1School of Civil Engineering and Architecture, Anhui University of Science and Technology, 168 Taifeng …

The results show the FBG sensors can be used in coal mines for coal mines safety. 2. FBG stress sensor applied in the coal mine. It is known that the reflective wavelength of …

The FBG strain sensors were applied to the Dongtan Mine to monitor the stress variation of the lined wall in the gateway retained along goaf of No. 3203 coal mining face on line. The results showed that the FBG strain sensor with high measuring range could measure the stress variation accurately during the support process of the gateway retained along …

Rock bolts have been widely applied with roadway excavation in underground coal mines to prevent roadway collapse and improve the stability of roadway surrounding rocks. Overloading and failures of rock bolts could result in accidents or casualties in coal mine roadways. Consequently, monitoring axial forces and work conditions of rock bolts plays …

worldwide. FBG sensors could be used in smar t condition monitoring system that can allow real-. time and continuous monitoring of the structural and operational conditions of trains as well as ...

This is a qualitative measure application of FBG sensor. The FBG neednt be calibrated to 'be used in heart rate detection. The FBG center wavelength of heart rate sensor is 1555nm. 3.3. The detection of posture The posture detection is very important to the rescue staffs who work in the special environment. The road of coal mine is uneven.

Semantic Scholar extracted view of "Application of FBG sensors for geotechnical health monitoring, a review of sensor design, implementation methods and packaging techniques" by C. Hong et al. ... integrity in underground coal mines.The major issues with the current roof stability monitoring system in underground coal mines … Expand. 3. 1 ...

the sensor was applied in a coal mine to measure the in situ stresses and monitor the stress changes in the roof. The presented FBG borehole deformation sensor can provide two built-in checks on the accuracy of the test, which can ensure the reliability and accuracy of test results. In addition, the FBG sensor can overcome the harsh environment ...

A high-resolution FBG sensor is proposed for crust deformation observation and earthquake monitoring. A narrow-linewidth tunable fiber laser is used to interrogate the FBG. The wavelength shift of the FBGs due to seismic signal is measured by swept optical suppressed carrier single sideband (SSB-SC) interrogation technique with a reference …

FBG sensors. Temperature, strain, displacement, pressure, and weight sensors. FBG accelerometers & tiltmeters. Skip to content. Phone: +1 617 939 9221. Email: info@optromix ... Accelerometer can be used in a wide range of monitoring applications including the vibration measurement of building structures, turbines, …

FBG sensors. Temperature, strain, displacement, pressure, and weight sensors. FBG accelerometers & tiltmeters. Skip to content. Phone: +1 617 939 9221. Email: info@optromix ... Accelerometer can be used in a …

A borehole deformation sensor for long-term stress monitoring in coal mine rock based on optical fiber Bragg gratings (FBGs) is presented. The sensor converts borehole deformation into optical fiber strain by using four rings. For each ring, two FBGs are bonded with the ring to measure the borehole deformation, and a reference FBG …

Application of the fiber Bragg grating (FBG) sensors in coal mines. Wang, Jinyu. ; Song, Guang-Dong. ; Hu, Binxin. ; Li, Lianqing. ; Liu, Tongyu. The FBG strain sensors were …

Download : Download high-res image (274KB) Download : Download full-size image Fig. 1. Schematic of an fiber Bragg grating sensor: (a) structure of a conventional FBG with different notations used for analytical formulation; (b) r.i. profile of the core region of the FBG; (c) ideal spectrum of the incident, transmitted, and reflected signal into a …

Based on the FBG-FMB practically applied in coal mine roadway, this paper proposes a desensitized FBG-FMB and introduces its monitoring method. The …

Abstract: The use of fiber Bragg grating (FBG) sensors is proposed to solve the technical problem of poor sensor stability in the long-term safety monitoring of shaft …

It can monitor various parameters but for the coal mines the most common sensors are FBG temperature sensors and FBG pressure sensors. Fiber optic sensors are embedded in the structure itself and function during the lifetime. FBG sensors have gained increasing interest due to their ability to alert about any tiny or critical changes.

To apply FBG sensors to the long-term monitoring of coal-mine shaft lining safety, such that the safety state of the shaft lining structure can be evaluated in real time and shaft …

Fiber Bragg grating (FBG) array is a powerful technique for quasi-distributed sensing along the entire length of sensing fiber with fast response and high precision. It has been widely used for temperature, strain, and vibration monitoring. In this review work, an overview on the recent advances of FBG arrays is conducted. Firstly, the fabrication …

The FBG sensor is an all-fiber passive device, which is a functional fiber sensor with FBG as a sensitive element. This type of sensor can be well adapted to the complex environment of coal mines and overcome the above problems [9–15]. At present, many scholars have carried out research on the application of FBG sensing technology …

First, the measurement principles and structure of the FBG borehole deformation sensor were introduced. Subsequently, the feasibility of the presented FBG sensor was validated through a series of tests. At last, the sensor was applied in a coal mine to measure the in situ stresses and monitor the stress changes in the roof.

Fibers can be inserted in hypodermic needles or catheters. That allows for more precise positioning of the fiber optic sensors. Moreover, fiber Bragg grating sensors are applied for temperature profiling near patients' internal organs. And finally, FBG sensors are produced for endoscopic/colonoscopic pressure profiling.