Ultra-short fiber optic temperature sensor based on fiber Bragg grating Fabry-Perot interferometer
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Fiber optic temperature sensors for small-scale heat sources have an urgent need in many industrial fields. We first propose and demonstrate an ultra-short fiber optic temperature sensor based on a Fabry-Perot (FP) interferometer which combines a fiber Bragg grating (FBG) with Fresnel reflection on the fiber end face. The FBG with a grating length of 50 μm was inscribed by a femtosecond laser line-by-line scanning technology. This FBG exhibits a resonant wavelength of 1548.8 nm and a broad full width at half maximum (FWHM) bandwidth of 12.4 nm. The selected dip wavelength of the FBG-FP cavity sensor changes linearly with the temperature increase, corresponding to the temperature sensitivity of 10.8 pm/°C. Moreover, the FBG-FP cavity sensor can be used to measure the temperature of the small-scale laser spot due to its compact structure. The experimental results show the temperature at different positions of laser exposure area are 138.4 °C, 111.5 °C and 74.4 °C, respectively.Keywords:
Fiber Bragg Grating
PHOSFOS
Fiber Bragg gratings have found widespread application in sensor systems, e. g. for temperature, strain or refractive index measurements. The concept of fiber Bragg gratings allows also in a simple way the realisation of arrays of such sensors. The development of such optical fiber sensor systems often requires special fibers and grating structures which may go beyond more conventional Bragg grating structures in typical communication fibers. Concerning fibers there is, for example., a need of achieving fiber gratings in small diameter fibers and fiber tapers as well as in microstructured fibers. Special fiber grating structures are of interest e.g. in the visible wavelength range, which requires smaller spatial structures compared to more conventional gratings in the near infrared wavelength region. Examples for such modern developments in fiber Bragg grating technology for sensor applications will be presented and discussed.
Fiber Bragg Grating
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Long-period fiber grating
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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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Fiber Bragg gratings have been demonstrated as a versatile sensor for structural health monitoring. We present an efficient and cost effective multiplexing method for fiber Bragg grating and fiber Fabry-Perot sensors based on a broadband mode-locked fiber laser source and interferometric interrogation. The broadband, pulsed laser source permits time and wavelength division multiplexing to be employed to achieve very high sensor counts. Interferometric interrogation also permits high strain resolutions over large frequency ranges to be achieved. The proposed system has the capability to interrogate several hundred fiber Bragg gratings or fiber Fabry-Perot sensors on a single fiber, whilst achieving sub-microstrain resolution over bandwidths greater than 100 kHz. Strain resolutions of 30nε /Hz1/2 and 2 nε/Hz1/2 are demonstrated with the fiber Bragg grating and fiber Fabry-Perot sensor respectively. The fiber Fabry-Perot sensor provides an increase in the strain resolution over the fiber Bragg grating sensor of greater than a factor of 10. The fiber Bragg gratings are low reflectivity and could be fabricated during the fiber draw process providing a cost effective method for array fabrication. This system would find applications in several health monitoring applications where large sensor counts are necessary, in particular acoustic emission.
Fiber Bragg Grating
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Long-period fiber grating
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This article demonstrates the indirect method of strain measurement using optical fiber sensors. The primary reason for this article is demonstrate the possibility to design cheap and small system for measurement of optical signal from fiber Bragg grating sensor (FBG) excluding optical spectrum analyzer. The proposed uncomplicated measurement system contain two FBGs inscribed in the same optical fiber which makes their temperature sensitivities equal. This property allows to use gratings with matched wavelengths as a following filters. The paper shows a results of a force measurement using matched FBG array and measuring system which presents real time measure.
Fiber Bragg Grating
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Long-period fiber grating
SIGNAL (programming language)
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Fiber Bragg Grating
PHOSFOS
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The power supply is needed for traditional automatic fire alarming system when it is running.Electrified alarming sensors are prone to cause a fire where there are combustive and explosive things.Fiber bragg grating(FBG) and distributed FBG sensors reduce fire risks greatly.This paper studies the performance of a fiber bragg grating and a fiber bragg grating sensor,based on the physical working of a fiber bragg grating and a fiber bragg grating sensor.
Fiber Bragg Grating
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Long-period fiber grating
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Fiber Bragg Grating
Apodization
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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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This letter demonstrates an approach for tuning fiber Bragg grating sensors with optical energy carried in the same optical fiber. Optical energy carried in the optical fiber was used to heat in-fiber Bragg gratings in order to alter the grating’s optical response to surrounding media. The functional enhancement of optically heated Bragg gratings as sensor devices is demonstrated by a dual-function Bragg grating temperature and level sensing array for liquid at room and cryogenic temperatures.
Fiber Bragg Grating
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Long-period fiber grating
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