scholarly journals Design of an information-measuring system for monitoring deformation and displacement of rock massif layers based on fiber-optic sensors

2021 ◽  
Vol 6 (5 (114)) ◽  
Author(s):  
Vyacheslav Yugay ◽  
Ali Mekhtiyev ◽  
Yelena Neshina ◽  
Bakhytkul Aubakirova ◽  
Raushan Aimagambetova ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Rock Massif ◽  
Fiber Optic Sensor ◽  
Measuring System ◽  
Processing Unit ◽  
Software Complex ◽  
Information Measuring ◽  
Optic Sensor ◽  
Information Measuring System

This paper reports a study into designing an information-measuring system that could be used in coal mines that are dangerous in terms of the explosion of coal dust and methane gas. The results of reviewing technical advancements in the field of fiber-optic system development are given. To solve the set task, prototypes of a fiber-optic sensor of a new type and a hardware-software complex were constructed. The research aims to improve the safety of workers at coal enterprises. The result of the theoretical research has established that additional losses related to a micro bending should be taken into consideration while accounting for the effect of photoelasticity. The fundamental difference between the idea reported here and existing analogs is the development of a hardware-software complex capable of working with a single-mode optical fiber of great length with a significant noise level. The data processing unit is equipped with a television matrix and can analyze changes in the pixels of a light spot. The proposed system is quasi-distributed; it controls individual points within a rock massif. The designed hardware-software system provides high noise immunity of measuring channels when the external temperature changes. The research results helped develop an information-measuring system for monitoring the deformation and displacement of rock massif layers based on fiber-optic sensors, capable of operating in an explosive environment. The system makes it possible to control several layers located in the roof of the workings, while the fiber-optic sensor may contain two or three sensitive elements that are connected to different channels. With a sharp fluctuation in pressure and an increase in the displacement parameter, the system triggers a warning signal about the danger.

The Application of Fiber Optic Sensor to the Study of Engineering Structure

2006 ◽  
Vol 326-328 ◽  
pp. 1351-1354
Author(s):  
Qi Rong Zhu ◽  
Ru Hua Fang ◽  
Guo Biao Yang ◽  
Wei Ming Zeng
Keyword(s):  
Fiber Optic ◽  
Experimental Testing ◽  
Smart Structure ◽  
Fiber Optic Sensor ◽  
Measuring System ◽  
Vibration Measurement ◽  
Technical Equipment ◽  
Electronic Measuring ◽  
Engineering Structure ◽  
Optic Sensor

The fiber optic sensor measuring system based on the Mech-Zehnder interferometry is developed in the paper. The system can be used for the strain and vibration measurement of engineering structure, and has the advantages: convenient adjusting, stable performance and strong ability of anti-interference, etc. Therefore the fiber optic sensor has been widely used in the engineering field. First the system is introduced into measuring the frequency and amplitude of the vibration subjected to force of the FRP-concrete beam. The fiber optic sensor measuring system and the electronic measuring system are synchronous used for the measurement. The analysis results of fiber optic sensor measurement approximate to the results of electronic strain gauge. Then the system is introduced into experimental stress analysis on the gas pipe, good results is obtained too. The paper provides new technical equipment for the experimental testing of various engineering structure using fiber optic sensor, also establishes the technical foundation of the research of smart structure.

scholarly journals Questions of application of fiber-optic sensors for monitoring crack growth during rock deformations

2021 ◽  
Vol 2140 (1) ◽  
pp. 012037
Author(s):  
V V Yugay ◽  
P Sh Madi ◽  
S B Ozhigina ◽  
D A Gorokhov ◽  
A D Alkina
Keyword(s):  
Optical Fiber ◽  
Fiber Optic ◽  
Single Mode ◽  
Mechanical Action ◽  
Fiber Optic Sensors ◽  
Fiber Optic Sensor ◽  
Mountain Range ◽  
Mining Equipment ◽  
Optic Sensor ◽  
Rock Deformations

Abstract The paper considers ways to solve the problem of developing a system for monitoring displacement in quarries, which are the main main cause of the collapse of boards and berms in quarries. To ensure safety and constant monitoring during work at the quarry, there are chiseled fiber-optic sensors. The fiber-optic sensor is made on the basis of a single-mode optical fiber, which makes it possible to measure the displacements of the mountain range at distances of about 30 km with high accuracy. Laboratory sample a fiber-optic sensor in its work uses a method for monitoring additional losses that occur during mechanical action on an optical fiber. The fiber-optic sensor was made to show a fairly high linearity and accuracy during measurements and can be used to control the deformation of the array after appropriate refinement of its design. This article is aimed at creating means of controlling the process of deformation and displacement of a mountain massif. Ultimately, the results of the study will help prevent accidents associated with the collapse of the sides. Since the growth of cracks in the rocks of the bort mountain massif leads to its sudden collapse and creates a significant danger for personnel, it also causes the failure of mining equipment.

Low-cost real-time fiber optic sensor for intrusion detection

Sensor Review ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Adel Abdallah ◽  
Mohamed M. Fouad ◽  
Hesham N. Ahmed
Keyword(s):  
Signal Processing ◽  
Intrusion Detection ◽  
Real Time ◽  
Fiber Optic ◽  
Reference Signal ◽  
Fiber Optic Sensors ◽  
Fiber Optic Sensor ◽  
Content Type ◽  
Intensity Modulated ◽  
Optic Sensor

Purpose The purpose of this paper is to introduce a novel intensity-modulated fiber optic sensor for real-time intrusion detection using a fiber-optic microbend sensor and an optical time-domain reflectometer (OTDR). Design/methodology/approach The proposed system is tested using different scenarios using person/car as intruders. Experiments are conducted in the lab and in the field. In the beginning, the OTDR trace is obtained and recorded as a reference signal without intrusion events. The second step is to capture the OTDR trace with intrusion events in one or multiple sectors. This measured signal is then compared to the reference signal and processed by matrix laboratory to determine the intruded sector. Information of the intrusion is displayed on an interactive screen implemented by Visual basic. The deformer is designed and implemented using SOLIDWORKS three-dimensional computer aided design Software. Findings The system is tested for intrusions by performing two experiments. The first experiment is performed for both persons (>50 kg) in the lab and cars in an open field with a car moving at 60 km/h using two optical fiber sectors of lengths 200 and 500 m. For test purposes, the deformer length used in the experiment is 2 m. The used signal processing technique in the first experiment has some limitations and its accuracy is 70% after measuring and recording 100 observations. To overcome these limitations, a second experiment with another technique of signal processing is performed. Research limitations/implications The system can perfectly display consecutive intrusions of the sectors, but in case of simultaneous intrusions of different sectors, which is difficult to take place in real situations, there will be the ambiguity of the number of intruders and the intruded sector. This will be addressed in future work. Suitable and stable laser power is required to get a suitable level of backscattered power. Optimization of the deformer is required to enhance the sensitivity and reliability of the sensor. Practical implications The proposed work enables us to benefit from the ease of implementation and the reduced cost of the intensity-modulated fiber optic sensors because it overcomes the constraints that prevent using the intensity-modulated fiber optic sensors for intrusion detection. Originality/value The proposed system is the first time long-range intensity-modulated fiber optic sensor for intrusion detection.

Fiber Optic Sensors for Monitoring Pipe Bending Due to Ground Movement

2006 ◽  
Author(s):  
Sam Cauchi ◽  
Thierry Cherpillod ◽  
Don Morison ◽  
Ed McClarty
Keyword(s):  
Fiber Optic ◽  
Monitoring Program ◽  
Fiber Optic Sensors ◽  
Ground Movement ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Coiled Fiber ◽  
Back Filling ◽  
Pipe Bending ◽  
Sour Gas

This paper describes an installation of fiber optic sensors designed to measure pipe bending due to ground movement at three sites on a 16” gas transmission line. The sour gas pipeline had failed in December, 2004 from excessive forces related to ground movement. As temporary mitigation the pipeline was daylighted to reduce the soil traction forces but a comprehensive monitoring program had to be developed before placing the pipeline back into conventional service. During the time when the section of pipeline was daylighted, three linear and three coiled fiber optic sensors were installed at each of three sites selected as part of a system designed to measure bending strains in the 0.01–1.0% range. The two types of sensors were placed in pairs approximately at the 12, 4, and 8 o’clock positions. Conventional vibrating wire (VW) strain gauges were also installed at the fiber optic sensor locations for comparison purposes. Slope inclinometers were installed at each of the instrumentation sites to correlate ground movement to pipe bending. Following pipeline re-coating, and back-filling, visits to the site were made at approximately monthly intervals to gather data at conveniently placed break-out boxes. The complete fiber optic sensor system functionality is described and results are presented that show how the raw strain data are transformed into bending using software that also serves as a secure database.

Simultaneous Measurement of Torsion and Curvature Using Curvature Fiber Optic Sensor

2008 ◽  
Vol 392-394 ◽  
pp. 448-453
Author(s):  
Y.L. Fu ◽  
H.T. Di
Keyword(s):  
Torsion Angle ◽  
Fiber Optic ◽  
Low Cost ◽  
Fiber Optic Sensors ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Optimal Direction ◽  
Maximal Sensitivity ◽  
Negative Bending ◽  
Torsion Deformation

Curvature fiber optic sensors are a kind of novel low cost sensors that can detect curvature directly and distinguish the positive bending and negative bending. This kind of sensor is used to detect torsion deformation of shaft in this paper. The optimal direction of curvature fiber optic sensor was analyzed in osculating plane and rectification plane and maximal sensitivity was gained. The results show that sensor response to the torsion angle is linear approximately. Torsion angle, curvature and bending direction of shaft were measured simultaneously by using curvature fiber optic sensors.

Chromophore Dynamics in Sol-Gel Glasses and Xerogel Clad Fiber Optic Sensors

1994 ◽  
Vol 346 ◽  
Author(s):  
Drew L'Esperance ◽  
Clarice A. Browne ◽  
Eric L. Chronister
Keyword(s):  
Energy Transfer ◽  
Fiber Optic ◽  
Rotational Diffusion ◽  
Sol Gel ◽  
Fiber Optic Sensors ◽  
Fiber Optic Sensor ◽  
Time Resolved ◽  
Optic Sensor ◽  
Sensor Device ◽  
Gel Glasses

ABSTRACTTime-resolved depolarization measurements are used to investigate rotational diffusion and optical energy transfer dynamics of chromophores incorporated into silica and aluminosilica solutions, gels, and glasses. The use of an organically doped sol-gel clad waveguide as a novel intrinsic fiber optic sensor device is also demonstrated, and advantages of time-resolved detection of the fiber optic sensor are illustrated.

The Development and the Use of Fiber Optic Sensors for the Structural Health Monitoring of Composite (GFRP) Structures

2002 ◽  
Author(s):  
Evageline Rivera ◽  
Dimos Polyzois ◽  
Douglas J. Thomson ◽  
Ningguang Xu
Keyword(s):  
Structural Integrity ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Fiber Optic Sensor ◽  
Sensor Technology ◽  
Promising Alternative ◽  
Interferometric Sensors ◽  
Optic Sensor ◽  
Composite Glass ◽  
Path Lengths

The development of a fiber optic sensor system for the long-term monitoring of composite glass fiber-reinforced polymer (GFRP) poles will be presented. There is a growing interest in developing techniques for evaluating and monitoring their structural integrity. In the past few years, fiber optic sensor technology has emerged as a promising alternative to conventional methods of monitoring such as strain gauges. Fiber optic sensors can be attached to or embedded in civil structures such as bridges, dams and buildings. They operate by responding to changes in temperature and strain on the structure. The long gauge fiber optic sensor measures the average strain between two points on a structure. Long gauges are interferometric sensors that involve phase matching two optical paths to create a maximum interference pattern at the photodetector. The strain is calculated using the distance in which the reference arm of the interferometer is moved in order to match the optical path lengths.

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