Effects of installing scheme on the strain measurement accuracy of optical fiber sensors
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Fiber bragg grating has become one of the widely used optical measurement technologies in the field of aviation structure monitoring because of its light weight, high sensitivity and immunity to electromagnetic interference. A strain transfer model is established for the surface attached fiber grating, the function between real strain and sensing strain is obtained. Basing on finite element simulation, strain field distribution of the sensing structure is analyzed and the distribution curve of strain transform rate is drawn. The strain calibration system of fiber grating is built to verify the accuracy of the model. The average error of this model is superior to 5.5% in the measurement range of 0-3000με. The study improves the measurement precision of surface bonded fiber grating sensor, which also provides academic bases and references for the aircraft structural health monitoring.Keywords:
Fiber Bragg Grating
Strain (injury)
Fiber optic sensors have a lot to offer in the field of structural health monitoring. The most widely investigated and implemented fiber optic sensors for structural health monitoring are fiber Bragg grating and fiber optic polarimetric sensor. Fiber Bragg grating sensors provide localized strain data, thereby providing local damage information, while fiber optic polarimetric sensors are known for their capabilities of global damage monitoring for both static and dynamic loadings. However, each sensor has to be used with its own instrumentation and processing system. In this article, it is shown that an fiber Bragg grating written on a polarizing maintaining fiber can discern information from both fiber Bragg grating and fiber optic polarimetric sensors using only one decoding system. This reduces costs and complexities. Furthermore, by proper multiplexing the polarizing maintaining-fiber Bragg grating sensor, it is possible to predict the damage location in plates. The results demonstrate that the damage site can be located in two-dimensional structures using this multiplexed sensing array.
Fiber Bragg Grating
Structural Health Monitoring
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A multipoint fiber optic refractive index sensor is presented, that is potentially capable of simultaneous measurement from many samples. The operation of this sensor is based on the reflection of light from a cleaved fiber end when the sensor is moved from one medium to another, while the sensor consists of two fiber couplers and an optical fiber Bragg grating (FBG). Experimental characterization of the sensor shows excellent agreement with numerical analysis and a precision of 0.002 and resolution of the order of 10-3. Through the use of multiple Bragg wavelengths measurement at multiple points is achieved.
Fiber Bragg Grating
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Reflection
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SIMULTANEOUS STRAIN AND TEMPERATURE MEASUREMENT USING COMBINED FIBER AND FIBER BRAGG GRATING SENSORS
We propose here a new technique for simultaneous strain and temperature measurement using a Fiber Bragg Grating sensors. This technique employs an interferometric detection using two Fiber Bragg Gratings. A fiber Bragg grating is used as a reference while another fiber Bragg grating and a length of a bare fiber are used as the two sensing elements. As the temperature and strain change, the length of the sensing elements, (Fiber and Fiber Bragg Grating) change. These changes result in a phase and wavelength shifts. To measure these effects we use a Folded Mach Zhender interferometer, and a detection system made out of two photodiodes and data processing system. The sensitivity and dynamic range are analyzed and presented.
Fiber Bragg Grating
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Long-period fiber grating
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The basic principle of temperature sensor based on fiber Bragg grating (FBG) is analyzed. A fiber Bragg grating temperature sensor is designed and produced. Using fiber Bragg grating as the sensor, fiber Bragg grating analyzer to demodulation the wavelength shift, the relationship between FBG wavelength shift and temperature is measured. Experimental result shows that the temperature sensitivity of fiber Bragg grating temperature sensor is 12.2pm/°C.
Fiber Bragg Grating
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Long-period fiber grating
Ultrasonic grating
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A fiber optic Bragg grating based acoustic emission sensor system is developed to provide on-line monitoring of cracks or leaks in reactor vessel head penetration of nuclear power plants. Various type of fiber Bragg grating sensor including the variable length of sensing part was fabricated and prototype sensor system was tested by using PZT pulser and pencil lead break sources. In this study, we developed a cantilever type fiber sensor to enhance the sensitivity and to resonant frequency control. Two types of sensor attachment were used. First, the fiber Bragg grating sensor was fully bonded to the surface using bonding agent. Second one is that one part of fiber was partially bonded to surface and the other part of fiber will be remained freely. The resonant frequency of the fiber Bragg grating sensor will depend on the length of sensing part. Various kinds of resonant type fiber Bragg grating acoustic emission sensors were developed. Also several efforts were done to enhance the sensitivity of FBG AE sensor, which include FBG spectrum optimization and electrical and optical noise reduction. Finally, based on the self-developed acquisition system, a series of tests demonstrate the ability of the developed fiber sensor system to detect a pencil lead break event and continuous leak signal.
Fiber Bragg Grating
Pencil (optics)
Acoustic Emission
Long-period fiber grating
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A novel fiber optic sensor for simultaneous measurement of temperature and salinity with multiplexed polymer-coated fiber Bragg gratings is demonstrated. It has been found that the polyimide-coated fibre Bragg grating respond to variations of both temperature and salinity while the acrylate-coated fiber Bragg grating is only sensitive to the environmental temperature. The experimental results showed that the temperature and salinity sensitivities of the multiplexed fiber Bragg grating sensor are 0.0102 nm/°C and 0.0038 nm/%S, respectively.
Fiber Bragg Grating
PHOSFOS
Temperature salinity diagrams
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A fiber optic Bragg grating based acoustic emission sensor system is developed to provide on-line monitoring of cracks or leaks in reactor vessel head penetration of nuclear power plants. Various type of fiber Bragg grating sensor including the variable length of sensing part was fabricated and prototype sensor system was tested by using PZT pulser and pencil lead break sources. In this study, we developed a cantilever type fiber sensor to enhance the sensitivity and to resonant frequency control. Two types of sensor attachment were used. First, the fiber Bragg grating sensor was fully bonded to the surface using bonding agent. Second one is that one part of fiber was partially bonded to surface and the other part of fiber will be remained freely. The resonant frequency of the fiber Bragg grating sensor will depend on the length of sensing part. Various kinds of resonant type fiber Bragg grating acoustic emission sensors were developed. Also several efforts were done to enhance the sensitivity of FBG AE sensor, which include FBG spectrum optimization and electrical and optical noise reduction. Finally, based on the self-developed acquisition system, a series of tests demonstrate the ability of the developed fiber sensor system to detect a pencil lead break event and continuous leak signal.
Fiber Bragg Grating
Acoustic Emission
Pencil (optics)
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Fiber optic temperature sensors were evaluated in the High Temperature Test Lab (HTTL) to determine the accuracy of the measurements at various temperatures. A distributed temperature sensor was evaluated up to 550C and a fiber Bragg grating sensor was evaluated up to 750C. HTTL measurements indicate that there is a drift in fiber Bragg sensor over time of approximately -10C with higher accuracy at temperatures above 300C. The distributed sensor produced some bad data points at and above 500C but produced measurements with less than 2% error at increasing temperatures up to 400C
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Abstract: Optical Fiber Sensor (OFS) has come quite considerable and famous in world of sensor technology where it has been used widely to detect for a changeable environment and responds to some output on other system such as in industrial, chemical analysis and monitoring. A Fiber Bragg Grating (Fiber Bragg Grating) is a kind of appropriated where the short fragment of optical fiber which certain and specific wavelength is reflected with light and the Bragg reflector started developed and transmits all others. The current project is concerned with the development characteristics and behaviors of strain and temperature sensors acting on Fiber Bragg Grating by a computer simulation. This study focuses on analyzing the performance of the characteristics and behavior of strain and temperature sensors acting on Fiber Bragg Grating. A strain sensor is used to measure strain on an object of which the resistance varies range with applied force. Meanwhile,for the temperature sensor is used to measure and detect any abnormality of temperature acting on Fiber Bragg Grating such as can lead into fire and accidents. This will found out on how Fiber Bragg Grating can demonstrate strain and temperature sensors. A simulation of the computer program (MATLAB) will be carried out to simulate due to the strain and temperature sensor of Fiber Bragg Grating. Keywords Fiber Bragg Grating, sensors; Strain; Temperature; Simulation; MATLAB
Fiber Bragg Grating
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Long-period fiber grating
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Optical fiber sensor studying is one of the most important research project for several dozens year,the discovery of optical fiber bragg grating sensor has brought a new technological breakthrough for the optical fiber sensor.The cross-sensitivity is the key problem of fiber grating sensors.The development of the fiber grating strain-temperature sensor is presented in this paper.The physical mechanics of simultaneous measurement of strain and temperature are analyzed.And one method which measured strain and temperature simultaneously based on the sample fiber Bragg grating is proposed.
Fiber Bragg Grating
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Long-period fiber grating
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