scholarly journals Numerical analysis of the strain values obtained by FBG embedded in a composite material using assumptions about uniaxial stress state of the optical fiber and capillary on the Bragg grating

2019 ◽  
Vol 13 (49) ◽  
pp. 177-189 ◽  
Author(s):  
Natalia Kosheleva ◽  
Valerii Matveenko ◽  
Grigorii Serovaev ◽  
Andrey Fedorov
Keyword(s):  
Composite Material ◽  
Stress State ◽  
Numerical Analysis ◽  
Optical Fiber ◽  
Uniaxial Stress ◽  
Bragg Grating

scholarly journals Analysis of Reliability of Strain Measurements Made with the Fiber Bragg Grating Sensor Rosettes Embedded in a Polymer Composite Material

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5050
Author(s):  
Valerii Matveenko ◽  
Natalia Kosheleva ◽  
Grigorii Serovaev ◽  
Andrey Fedorov
Keyword(s):  
Composite Material ◽  
Stress State ◽  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Polymer Composite ◽  
Optical Spectrum ◽  
Uniaxial Stress ◽  
Polymer Composite Material ◽  
Bragg Grating ◽  
Two Peaks

The results of strain measuring experiments, with the help of rosettes consisting of fiber Bragg grating sensors (FBG) embedded at the manufacturing stage in a polymer composite material are considered in this paper. The samples were made by the direct pressing method from fiberglass prepregs. A cross-shaped sample was tested under loading conditions corresponding to a complex stress state. A variant of strain calculations based on experimental data is discussed. The calculations were performed under the assumption of a uniaxial stress state in an optical fiber embedded in the material. The obtained results provide a reasonable explanation of the absence in the conducted experiment of two peaks in the reflected optical spectrum, the presence of which follows from the known theoretical principles. The experimental result with two peaks in the reflected optical spectrum was obtained for the same sample under a different loading scheme. The proposed variant of the numerical model of the experiment and the results of numerical simulation made for FBG rosettes embedded in the material allowed to estimate error in the strain values calculated on the assumption of the uniaxial stress state in the optical fiber and in the presence of two peaks in the reflected optical spectrum.

scholarly journals Numerical Analysis of the Effect of Microscale Components Interaction on Measurements of Fiber Optic Strain Sensors Used in Composite Structures

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Mikhail Tashkinov ◽  
Igor Shardakov
Keyword(s):  
Composite Material ◽  
Numerical Analysis ◽  
Optical Fiber ◽  
Composite Structures ◽  
Fiber Optic ◽  
Strain Tensor ◽  
Strain Sensors ◽  
Numerical Estimation ◽  
Structural Components ◽  
Fiber Optic Strain Sensors

The paper investigates the influence of structural components of a composite material on the strain values measured by using an embedded optical fiber with Bragg gratings. The effect of composite plies and intermediate epoxy layers on the transfer of deformations from the measured object to the optical fiber was studied taking into account various methods of the fiber attachment and surrounding media configurations. A numerical estimation of the effect of the longitudinal and transverse components of the strain tensor on the wavelength of the reflected spectrum is performed.

scholarly journals Sensitivity-Tunable Oscillator-Accelerometer Based on Optical Fiber Bragg Grating

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 223
Author(s):  
Xiangpeng Xiao ◽  
Jinpeng Tao ◽  
Qingguo Song ◽  
Yuezhen Sun ◽  
Jiang Yang ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Theoretical Analysis ◽  
Optical Fiber ◽  
Resonant Frequency ◽  
Resonance Frequency ◽  
Fiber Bragg Grating ◽  
Vibration Isolation ◽  
Bragg Grating ◽  
P Parameter ◽  
Tunable Oscillator

We demonstrate a fiber Bragg grating (FBG)-based oscillator-accelerometer in which the acceleration sensitivity can be tuned by controlling the location of the mass oscillator. We theoretically and experimentally investigated the performance of the proposed accelerometer. Theoretical analysis showed that both the mass and location of the oscillator affect the sensitivity and resonant frequency of the accelerometer. To simplify the analysis, a nondimensional parameter, P, was introduced to tune the sensitivity of the FBG-based oscillator-accelerometer, which is related to the location of the mass oscillator. Numerical analysis showed that the accelerometer sensitivity is linearly proportional to the P parameter. In the experiment, six FBG-based oscillator-accelerometers with different P parameters (0.125, 0.25, 0.375, 0.5, 0.625, 0.75) were fabricated and tested. The experimental results agree very well with the numerical analysis, in which the sensitivity of the proposed accelerometer linearly increased with the increase in parameter P (7.6 pm/g, 15.8 pm/g, 19.3 pm/g, 25.4 pm/g, 30.6 pm/g, 35.7 pm/g). The resonance frequency is quadratically proportional to parameter P, and the resonance frequency reaches the minimum of 440 Hz when P is equal to 0.5. The proposed oscillator-accelerometer showed very good orthogonal vibration isolation.

Numerical analysis of SPR-based optical fiber biosensor

2014 ◽  
Author(s):  
Peyman Jahanshahi ◽  
Barmak Honarvar Shakibaei ◽  
Shee Yu Gang ◽  
Faisal Rafiq Mahamd Adikan
Keyword(s):  
Numerical Analysis ◽  
Optical Fiber
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