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Abstract
A new water pressure sensor based fiber Bragg grating was fabricated. The sensitivity of the pressure sensor was calculated with ANSYS. The sensor was installed in coalmine to monitor the water pressure remotely and compared with manometer. It validated the feasibility of the sensor in the coalmine water pressure monitoring.
... Fibre optic CO gas sensor based on 1567nm DFB diode laser absorption provides a promising means for on-line monitoring [6]. Water flooding is another major hazard which can be monitored via detection of water level of the reservoir in coal mines or pH and other water parameters in the reservoir [7]. Most fire incidents in the mines ignited by external fire source, which quite often due to electrical machinery failure, such as electrical spike or conveyer belt fracture and split. ...
... Fibre Bragg grating (FBG) based pressure and temperature sensors have been well developed. We have developed a series of water pressure sensors to monitor water pressure in the mine reservoir [7]. FBG sensors also developed for monitoring hot spots in switchgears and cable joints. ...
We report the development of a comprehensive safety monitoring solution for coal mines. A number of fibre optic sensors have been developed and deployed for safety monitoring of mine roof integrity and hazardous gases. The FOS-based mine hazard detection system offers unique advantages of intrinsic safety, multi-location and multi-parameter monitoring. They can be potentially used to build expert systems for mine hazard early detection and prevention.
... Проектирование и планирование подземной шахты нацелено на создание интегрированной системы, в которой добыча и переработка полезных ископаемых осуществляется для определенного рынка при минимальных эксплуатационных расходах и высоких требованиях безопасности. Горная система требует междисциплинарной инженерной структуры и координации его работы [1][2][3][4][5][6][7][8][9]. Одним из важных аспектов функционирования сложной системы шахты является безопасность проведения горных работ. ...
... A scientific analysis of similar research performed by foreign authors that work with optical fibers and develop fiber-optic sensors has been performed in [2][3][4][5][6][7][8][9][10]. Most of that relates to the use of fiber to build sensors for the mining industry. ...
This article deals with the impact of optical fiber bends on the level of optical losses. The main task of this research was to carry out a series of experiments using the optical time domain reflectometer (OTDR VISA) under field operating conditions for obtaining of optical loss parameter's dependencies from different bending radii of optical fibers and from the fibers number. We have studied the processes ofthe occurrence of optical losses in the investigated object and elaborated deterministic models of the physics of the phenomena along with the description undelraying physical processes during the bending. As the outcome of the experiment, a number of dependencies of the optical losses intensity from the number of bends in the fiber, the radii and the wavelength is elaborated. A methodology of the calculation of the signal strength from the number of bends is given. During the work, the excessive losses were noted in case of non-compliance with the installation technology and operating rules. The results of cable research are adopted by Kazakhtelecom JSC.
... Building on the achievements of foreign scientists and taking into account the well-known advantages of the fiber-optic sensors (FOS), we work to create the high performance information and measurement system (IMS) based on the fiber-optic sensors with improved metrological and operational characteristics for subsequent implementation in the mining sector of Kazakhstan which has enabled a number of security issues to be solve when operating in difficult and dangerous conditions of coal mines of Karaganda coal basin [2]. To create the IMS based on the FOS the research was conducted which is aimed at finding a structural design of the pressure control sensor of the rock mass on the timber elements. ...
The relevance of the work is due to the importance of creation of information-measuring systems and monitoring systems of a new generation to ensure the safety of mining operations and coal production which allow to control all the necessary parameters. The aim of this work is the development of information-measuring system for monitoring the technical condition of the mining facilities.
The paper presents the developed fiber-optic sensors for monitoring pressure measurement on the elements of mine supports. The sudden destruction of the support leads to the collapse of the mine workings and poses a serious threat to the life and safety of underground workers. A fiber-optic system for monitoring changes in pressures on the elements of mine supports will increase the share of mining automation and reduce the share of manual labor, as well as eliminate measurement errors associated with the human factor. Systematic monitoring of the state of the working elements of the support will allow timely tracking of their deformations caused by an increase in rock pressure on them. Implementation of the system at mining enterprises will expand the use of digital technologies in mining. Timely warning of a mine collapse threat will significantly increase the level of safe mining operations, as well as reduce the cost of supporting mine workings, since elimination of the consequences of destruction is associated with significant material costs. This work presents a developed laboratory testbench that simulates a mine working and elements of an arch support on which are installed the fiber-optic sensors connected to an automated measuring system. The developed hardware and software complex provides the processing of a light spot falling on the surface of a television matrix that is installed at the exit from the optical fiber. The results of visual processing are converted into numerical values, which are used to make a decision about the state of the considered object. In addition to automatic monitoring of the structural integrity condition of the considered object, the system is equipped with a function of a visual display for monitoring results, which makes it possible to track sharp fluctuations and bursts of pressure parameters, based on which the prediction of pre-emergency and emergency situations is performed.
Utilizing a super-luminescent diode (SLD) in 1330 nm band and a fiber Fabry-Perot tunable filter (FFP-TF), an optical fiber methane sensing system is experimentally demonstrated. The differential absorption technique and a reference method are employed: a reference channel is introduced to eliminate the fluctuation of light source spectrum, and the two wavelengths are acquired by tuning the FFP-TF. The influence of the light source, loss of leading fiber, and the filters' variations are all avoided. A minimum detectable methane concentration of 0.15% achieved.
A metalized FBG pressure sensor encapsulated by dual bellows structure was designed based on the strain characteristics of optical fiber Bragg grating (FBG) and osmotic sensing principle. And the experimental system of dual bellows FBG pressure sensor is established. The experimental results show that the pressure sensitivity coefficient of dual bellows FBG pressure sensor is 184.98nm/MPa with the measuring range 10 kPa. The correlation coefficient is better than 99.9% and the resolution is up to 0.05% full scale (FS). The sensitivity of dual bellows structure is high, which indicate that the dual bellows structure encapsulation is suitable for the sensoring in small measuring range.
In this paper, a FBG pressure sensor encapsulated by flat diaphragm structure is designed based on the strain characteristic of optical fiber Bragg grating (FBG) and seepage sensing principle. The structure and parameters of sensor are simulated and optimized using ANSYS finite element analysis software based on the mechanics model of flat diaphragm. The metalized FBG is processed into FBG pressure sensor, and the experimental system of flat diaphragm FBG pressure sensor is established. The theoretical and experimental results show that the pressure sensitivity coefficient of flat diaphragm FBG pressure sensor, whose measuring range is 0.5MPa, is 2.3×10-3(MPa)-1, and the linearity is 0.9720. The linearity of flat diaphragm structure is poor within 9KPa, which indicate that the flat diaphragm structure encapsulation is more suitable for the sensors in large measuring range.
A kind of fiber Bragg grating press sensor with uniform strength beam is presented, in order to measure the distributing pressure in a molding cavity. The wavelength increment of the sensor is linearly proportional to the pressure, and the linearity can attain 0.99992. The measurement of distributing pressure in molding cavity has been achieved by using six fiber Bragg grating press sensors embedded into the moulds. The force acted on the sensor is transferred by a metal pole. Good results have been obtained. During powder extrusion experiment, the distribution of pressure in cavity and its change have been observed, which is very important for design and fabrication of mould in future.
A high-pressure resistant fiber Bragg grating (FBG) pressure sensor using a metallic elastic cylinder as the substrate is designed, the properties of the said sensor are tested in the temperature range of 16-60°C and the pressure range of 0-52 MPa. and its performance parameters and the temperature revise factor are calculated. Results show that the performance of the said sensor is stable, with its repeatability being good, the tuning range of linearity being 4.066 nm, the pressure sensitivity being 0.0782 nm/MPa, and the wavelength resolving capability for pressure demodulation being 1.56 pm. After the temperature is revised, the opposite error margin of the pressure measure is reduced from 5.2% to 0.25%, Double sealing design has been adopted, thus avoiding fluid or gas leakage. By selecting the materials of different elastic moduli, the inner diameter and thickness, the measuring range and sensitivity of the said sensor can be adjusted.