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Because the import optical pulse width is limited to phonon lifetime T (T = 10 ns for silica fiber), meter spatial resolution can be realized in the Brillouin optical fiber sensor. But centimeter spatial resolution is required in Structural Health Monitoring (SHM). To improve spatial resolution and keeping the import optical pulse width, a technique for fitting the spectrum data of Brillouin optical...
It's very important to monitor the mechanical condition of portal crane for the device safety management. According to the characters of portal crane, a wireless monitoring system of the mechanical condition has been designed in the paper, including the status of metal structure, slewing bearing and speed reducer. The system has solved the temperature drift, zero point setting and other problems of...
An FBG sensing network consisting of over 200 sensors are installed on the Guangzhou New TV Tower for long-term monitoring of strain, temperature and inclination to provide a mean for structural health monitoring of super-tall structures.
We propose a hybrid fiber optic sensor consisting of a fiber Bragg grating and a birefringent fiber for structural health monitoring. Fiber Bragg grating has been used for quasi-distributed measurement and modal interference in birefringent fiber for fully distributed measurement of strain simultaneously. Results are presented for the applied strain of 0-2500 μstrain in simply supported...
Strain gauges are useful sensors in many engineering and medical applications. In case of using one gauge for measurement; quarter-bridge configurations, current flowing when power is delivered to the electrical strain gauge causes temperature rise; transient heat effect (THE); and consequently apparent strain appearing as drift of the zero baseline. Fiber optics has been used to measure both temperature...
Wind energy is one of renewable energy sources, which is copiously available without any limitation. Wind turbines are used to tap the potential of wind energy. Thus, stability and reliability of wind turbine is critical to extract this maximum amount of energy from the wind. To keep the wind turbine in operation, implementation of condition monitoring is paramount. This paper, firstly, demonstrates...
In this paper, we present a smart transducer interface module (STIM) for distributed optical fibre smart sensors. The STIM is a general purpose interface that has been designed to be used with intensiometric optical fibre sensors. The interface is made up of 2 optical fibre PIN receivers, a differential amplifier and a digital signal processor. The two received signals are differentially amplified...
We describe the use of swept-wavelength interferometry (sometimes referred to as optical frequency domain reflectometry, OFDR) for high speed, distributed fiber-optic sensing. The technique utilizes continuous gratings written in single mode fiber facilitating high density distributed measurements of temperature or strain up 1 millimeter resolution. The technology used herein is capable of strain...
The safety and reliability is very important for railway industry. In this paper we propose a fiber Bragg grating monitoring system on line to realize real-time, fast, distributed measurement of physical quantities such as temperature, strains and vibration of the railway. The fiber Bragg grating sensor can be able to bear high pressure, resistant to corrosion and resist the electromagnetism disturbance,...
Design and construction of fibre Bragg grating sensor systems are described for implementation of structural health monitoring in energy plants. Concrete application examples in conventional, renewable and nuclear energies demonstrate their versatility and achievement potential.
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.
To satisfy bridge health monitoring and maintain, a novel low cost sensing system for simultaneous measurements of temperature, strain and pressure based on practical fiber Bragg grating (FBG) is reported in this paper. The main principles of multi-parameter are introduced. A wavelength scanning demodulation system based on continuous wave tunable frequency is designed. The practical FBG sensors have...
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