An embedded FBG sensor for simultaneous measurement of stress and temperature

Jin, Long; Zhang, Weigang; Zhang, Hao; Liu, Bo; Zhao, Jian; Tu, Qinchang; Kai, Guiyun; Dong, Xinyong

doi:10.1109/lpt.2005.860046

Cited by 104 publications

(38 citation statements)

References 8 publications

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“…For example, a standard fiber Bragg grating (FBG) has a sensitivity of 13 pm/ºC at 1.5 μm, whereas a sensitivity of 108 pm/ºC was reported for a polymer coated FBG. 9 Using long period gratings (LPG) larger sensitivities can be obtained (310 pm/ºC), 10 but still about 2 orders of magnitude smaller than our present results.…”

Section: Sensor Applicationscontrasting

confidence: 69%

Cutoff properties of liquid-filled Ge-doped microstructured fibers

et al. 2010

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The guidance of the fundamental mode of microstructured fibers with a Ge-doped core can be cut off by filling the holes with a material, liquid in our case, that increases the refractive index in the air-holes up to a value between the refractive index values of the Ge-doped region and the silica. A section of such a liquid-filled fiber defines a short-pass filter widely tunable by adjusting slightly the refractive index values. Thus, a small change of temperature or a small strain of the fiber can be used to adjust the transmittance of the filter. Alternatively, temperature changes and strain could be determined by measuring the cutoff wavelength. A simple measurement of the power transmitted through a short section of liquid-filled fiber can be used to monitor temperature and strain, enabling the measurement of fast transients such as mechanical vibrations. Several Y-shaped fibers with a Ge-doped core were fabricated. This microstructure with only three big holes surrounding the core makes straightforward the filling of the fiber with liquids. The experimental characterization includes the measurement of the cutoff wavelength of a number of devices with different lengths, different microstructure geometries and different refractive index liquids. The cutoff wavelength and the transmission were measured as a function of temperature and strain. A simple theoretical simulation permits to explain the experimental results.Microstructured optical fiber, photonic crystal fiber, cutoff wavelength, short-pass filter, fiber sensor.

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Section: Sensor Applicationscontrasting

confidence: 69%

Cutoff properties of liquid-filled Ge-doped microstructured fibers

et al. 2010

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“…By artificially enlarging the stiffness of the compensating grating, it will sense a different strain (by integrating it in a capillary [101], by bonding it to another dummy fibre [106], or embedding it into another material [107]). Another special configuration is introduced by Silva et al [108].…”

Section: Temperature Compensationmentioning

confidence: 99%

Strain Measurements of Composite Laminates with Embedded Fibre Bragg Gratings: Criticism and Opportunities for Research

Luyckx

Voet

Lammens

et al. 2010

Sensors

225

148

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Embedded optical fibre sensors are considered for structural health monitoring purposes in numerous applications. In fibre reinforced plastics, embedded fibre Bragg gratings are found to be one of the most popular and reliable solutions for strain monitoring. Despite of their growing popularity, users should keep in mind their shortcomings, many of which are associated with the embedding process. This review paper starts with an overview of some of the technical issues to be considered when embedding fibre optics in fibrous composite materials. Next, a monitoring scheme is introduced which shows the different steps necessary to relate the output of an embedded FBG to the strain of the structure in which it is embedded. Each step of the process has already been addressed separately in literature without considering the complete cycle, from embedding of the sensor to the internal strain measurement of the structure. This review paper summarizes the work reported in literature and tries to fit it into the big picture of internal strain measurements with embedded fibre Bragg gratings. The last part of the paper focuses on temperature compensation methods which should not be ignored in terms of in-situ measurement of strains with fibre Bragg gratings. Throughout the paper criticism is given where appropriate, which should be regarded as opportunities for future research.

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“…Besides numerous advantages of the fiber-optic technology in telecommunication application [5][6][7][8], fiber-optic sensors especially FBG sensors have gained popularity in fiber optic sensing applications because of their simplicity, low cost, minimal electromagnetic interference, wide dynamic range, negligible loading effect, and relatively long distance communication. Hence, the fiber-optic sensing technology is a potential alternative to the traditional sensors for acceleration, rotation, electric and magnetic field measurement, temperature, pressure, displacement, acoustics, vibration, linear and angular position, stress, strain, viscosity, humidity chemical compositions, and many other sensing applications [1][2][3][9][10][11][12][13][14]. Compared with other implementations of fiber-optic sensors, FBG sensors offer a distinguishing advantage over others through the insensitivity of absolute measurement to the source fluctuations as the detection is purely based on the wavelength shift introduced by the measurand.…”

Section: Introductionmentioning

confidence: 99%

Polarization multiplexed interrogation technique for FBG sensor array

et al. 2015

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This paper proposes a polarization multiplexed interrogation technique for fiber Bragg grating (FBG) sensor array. The novelty of the proposed model is its ability to reduce interference and cross talk, thus allowing larger number of FBG sensors to be interrogated in an array. The calibration technique has been illustrated in this work for the FBG sensor array, where data from each sensor are linearly polarized and multiplexed before co-propagation, to find out the tapping points that enable identification of each sensor data uniquely. Simulation has been carried out for odd number and even number of sensors in an array. Even with interfering input, this proposed scheme can interrogate and distinctively identify each sensor data using appropriate tuning of polarization-splitter, polarization-rotator, and polarization-attenuator at the detector end during the calibration process. The significance of the proposed method is its compact size, which makes this calibration system ready to be deployed in real-time sensing applications and data acquisition from the FBG sensor array.

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An embedded FBG sensor for simultaneous measurement of stress and temperature

Cited by 104 publications

References 8 publications

Cutoff properties of liquid-filled Ge-doped microstructured fibers

Cutoff properties of liquid-filled Ge-doped microstructured fibers

Strain Measurements of Composite Laminates with Embedded Fibre Bragg Gratings: Criticism and Opportunities for Research

Polarization multiplexed interrogation technique for FBG sensor array

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