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We report a fiber optic vibration sensor developed from a Fiber Bragg Grating (FBG) sensor. Three FBG vibration sensors are constructed and subjected to drop test, vibration test and mock train-railway positioning test. All the Bragg wavelengths of the sensors, as well as the Fast Fourier Transform (FFT) graphs are recorded by a computer via an FBG interrogator. Two commercial FBG vibration sensors...
High-speed railway is being developed rapidly; its safety, including infrastructure and train operation, is vital. This paper presents a railway-subgrade vibration monitoring scheme based on phase-sensitive OTDR for railway safety. The subgrade vibration is detected and rebuilt. Multi-dimension comprehensive analysis (MDCA) is proposed to identify the running train signals and illegal constructions...
An important factor affecting the operation of any mechanical unit is the vibration of its individual components. Therefore, the development of tools for the continuous monitoring of vibration loads at critical points in the design of assemblies and mechanisms can be considered one of the most promising ways of increasing the quality and reliability of the technological equipment. Contactless fiber...
The task of monitoring the machine vibration is a challenge in the current industrial scenario. The precision and the monitoring technology confront the state-of-the-art in mechanical vibration. To monitor the number of vibrations a complete functional performance model is to be provided. The number of vibrations generates a PWM signal which is acquired through Beaglebone Black and is logged over...
End-winding vibration issues have been an ever increasing subject of interest in the industry, specifically in the past decade. Increasing numbers of major failures due mostly to insulation breakdown have been directly attributed to end-winding vibration. The importance of monitoring this phenomenon has become quite clear to the industry in order to prevent these failures, correct ineffective end-winding...
In the oil field development and production, fluid flow is an extremely important parameter which determines the transmission characteristics of the oil production, real-time monitoring of fluid flow parameter provides a scientific basis for oil and gas optimization exploration and increase of reservoir recovery. A method for interrogating fiber optic sensors using flow-induced pipe vibration is proposed,...
This article shows the design of a fiber-based sensor for living activities in human body and the results of laboratory evaluation carried out on it. The authors have developed a device that allows for monitoring the vibrations of human body evoked by living activities - breathing and cardiac rhythm. The device consists of a Bragg grating inscribed into a single-mode optical fiber and operating on...
Ship's vibration are caused by the propeller, engine and auxiliary machinery, bow thruster and effects of the sea. Vibrations can be so high that it provides discomfort on board and make damage to ship's hull, machinery and equipments. During recent years fiberoptic sensors have gained increasing interest in the field of ship monitoring. Fiber optic sensors have been used in a wide variety of applications;...
Fiber optic sensors have a potential to make ideal vibration sensors for smart structures because they can be operated without supplying the power at the sensor itself, have the capability of resistance to corrosion and fatigue, immunity to electrical interference, usage for a long time and safe. Additionally, the fiber optic sensors are practically able to operate the remote sensing due to stable...
Distributed sensors provide the tempertaure, strain, vibration and acoustic wave measurement at centimeters resolution over kilometer length. They are the ideal tools for the safety and security monitoring of large civil structures.
An analytically tractable model is presented to describe oil and gas pipeline safety monitoring system. The basic idea is that it uses fiber sensor to collect signals produced by soil vibration around pipelines, and then focuses on intelligent processing and smart recognition of soil vibration signals. Finally, we implement the developed model and it is practically used in Jiangsu, China. Experiment...
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