Simultaneous measurement of strain and temperature using a tilted fiber Bragg grating

Takeda, Shin‐ichi; Sato, Masashi; Ogasawara, Toshio

doi:10.1016/j.sna.2021.113346

Cited by 13 publications

(7 citation statements)

References 16 publications

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“…The flow field calculation includes gravity, and the gravitational acceleration along the negative z-axis is 9.8 m/s 2 . To enable the model to converge faster, the initial speed of transformer oil is set to 0.01 m/s, with the direction along the positive z-axis [25]. A non-isothermal flow multi-physical field interface is selected to couple the laminar flow field and the solid and fluid heat transfer field.…”

Section: Coupling Of Thermal and Laminar Flow Fieldmentioning

confidence: 99%

Magnetic-Thermal-Flow Field Coupling Simulation of Oil-Immersed Transformer

Feng,

Zhang,

Zhao

et al. 2024

IEEE Access

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Accurately understanding the temperature field distribution and hot-spot temperature of oilimmersed transformers is of great significance for ensuring the safe and stable operation of the transformer. A magnetic-thermal-flow coupling simulation model for oil-immersed transformer is established in this paper. In order to better simulate the heat dissipation process of the transformer, the winding uses a pie shaped structure with interval arrangement instead of the traditional cylindrical structure. The losses of iron core and winding are calculated through magnetic field simulation. Then, the losses are used as heat source for coupling simulation of thermal field and laminar flow to obtain the oil flow distribution, 3-D temperature field distribution, and temperature and location distribution of hot-spot. Finally, coupling simulations are conducted under different load currents to analyze the impact of load currents on the temperature and location of transformer hotspots. The simulation results show that as the current increases, the hot-spot temperature increases. When the load current changes, the hot-spot fluctuates within the range of 85% -90% of the total height of the low-voltage winding, providing a methodological basis for the maintenance of transformers and monitoring of hot-spot temperatures.INDEX TERMS transformer; magnetic-thermal-flow field; temperature field; hot-spot temperature

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Section: Coupling Of Thermal and Laminar Flow Fieldmentioning

confidence: 99%

Magnetic-Thermal-Flow Field Coupling Simulation of Oil-Immersed Transformer

Feng,

Zhang,

Zhao

et al. 2024

IEEE Access

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“…However, because optical fibers are sensitive to both strain and temperature, it is necessary to compensate for the effects of temperature variation due to the surrounding environment when obtaining the mechanical strain. Therefore, various methods of separating the effects of strain and temperature have been studied, such as the superimposed fiber Bragg grating (FBG) [ 3 ], hybrid FBG [ 4 ], superstructure FBG [ 5 ], FBG with different diameters [ 6 ], single-mode fiber-based up-taper–down-taper–up taper (UDU) structure [ 7 ], sidelobe power of the FBG [ 8 ], and tilted FBG [ 9 , 10 ]. In SHM, distributed measurements are particularly beneficial.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Measurement of Strain and Temperature Distributions Using Optical Fibers with Different GeO2 and B2O3 Doping

Hisada

Kodakamine

Wada

et al. 2023

Sensors

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Compensating for the effects of temperature is a crucial issue in structural health monitoring when using optical fiber sensors. This study focused on the change in sensitivity due to differences in GeO2 and B2O3 doping and then verified the accuracy when measuring the strain and temperature distributions simultaneously. Four types of optical fiber sensors were utilized to measure the strain and temperature in four-point bending tests, and the best combination of the sensors resulted in strain and temperature errors of 28.4 μϵ and 1.52 °C, respectively. Based on the results obtained from the four-point bending tests, we discussed the error factors via an error propagation analysis. The results of the error propagation analysis agreed well with the experimental results, thus indicating the effectiveness of the analysis as a method for verifying accuracy and error factors.

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“…Tilted fibre Bragg grating (TFBG) has an interesting transmission spectrum that is sensitive to changes in several physical quantities such as temperature [ 1 ], bending [ 2 ], strain [ 3 ], and polarisation state [ 4 ]. TFBG gratings can also be used to measure several parameters simultaneously [ 5 , 6 , 7 , 8 ]. As with any fibre optic sensor, the main advantage is the small size of the sensor.…”

Section: Introductionmentioning

confidence: 99%

A Wavelet Derivative Spectrum Length Method of TFBG Sensor Demodulation

Cięszczyk

Skorupski

Wawrzyk

et al. 2023

Sensors

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Fibre optic sensors using tilted fibre Bragg grating (TFBG) have high sensitivity for refractive index measurements. In order to achieve good metrological parameters of the measurement, an appropriate method of spectrum demodulation must be used. The method proposed in the article is an improvement of the spectral length algorithm. The spectral length parameter is treated as the sum of the derivative filter responses. In the original version, the first difference of spectrum elements was used, while this article proposes to use the wavelet transform to calculate the numerical derivative approximation. The advantage of this solution is an easy way to select the level of smoothing filtration by changing the scale parameter. The derivation is appropriate even for a relatively low signal-to-noise level. The approximation of the spectral length by the derivative calculated using the wavelet transform eliminates the high-frequency noise of the optical signal. The absolute value of determined spectral derivatives after significant smoothing can be used to estimate the wavelength of the decay of modes. After analyzing experimental data and performing calculations, it turns out that this is a linear method with better resolution than the contour length algorithm.

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Simultaneous measurement of strain and temperature using a tilted fiber Bragg grating

Cited by 13 publications

References 16 publications

Magnetic-Thermal-Flow Field Coupling Simulation of Oil-Immersed Transformer

Magnetic-Thermal-Flow Field Coupling Simulation of Oil-Immersed Transformer

Simultaneous Measurement of Strain and Temperature Distributions Using Optical Fibers with Different GeO2 and B2O3 Doping

A Wavelet Derivative Spectrum Length Method of TFBG Sensor Demodulation

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