Self-Compensative Fiber Optic Current Sensor

Huang, Yuhao; Xia, Li; Pang, Fubin; Yuan, Yubo; Ji, Jianfei

doi:10.1109/jlt.2020.3044935

Cited by 20 publications

(4 citation statements)

References 26 publications

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“…Fiber optic current sensors can be classified into several main types based on various principles. The first type of fiber optic current sensor uses the Faraday magneto optic effect to measure current [2,[5][6][7][8][9][10]. In this method, since the current cannot be directly measured through optical fibers, it is usually indirectly measured by measuring the magnetic field generated by Faraday magneto-optical effect.…”

Section: Introductionmentioning

confidence: 99%

“…However, the Verdet constant of standard silica fibers is very low, and in order to achieve high current sensitivity, special method must be adopted, such as using ultra long fiber coils as sensor heads [6]. This invisibly increases the manufacturing difficulty of sensors, and too long the fiber length can also increase the linear birefringence effect and be easily affected by temperature and stress [7,8]. The second type of fiber optic current sensor combines magnetic fluid and fiber optic sensor, and then using magnetic fluid to measure magnetic field and indirectly measure current [2,[11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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High sensitivity fiber optic current sensor based on Fabry–Perot interferometer manufactured by femtosecond laser

Hu,

Guo,

Jiang

et al. 2024

Meas. Sci. Technol.

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A novel fiber optic current sensor was prepared based on femtosecond laser processing technology and magnetostrictive material Terfenol-D.Its principle is to use the linear stretching of Terfenol-D material under the action of current to cause linear shift in the sensor spectrum. Firstly, we fabricated Fabry-Perot interfenometer (FPI1) using femtosecond laser in a tapered few mode fiber. Then, FPI2 was prepared using the end face of FPI1, quartz capillary, and single-mode fiber. When cascading FPI1 and FPI2, by adjusting the air-cavity length of FPI2, they form a harmonic vernier effect (HVE) sensor. In HVE sensors, FPI1 forms a cantilever beam inside the capillary, which is not affected by axial strain. Therefore, when the axial strain acts on the HVE sensor, the effective length of axial strain increases to the entire length of the quartz capillary, greatly amplifying the strain sensitivity. Finally, the Terfenol-D rod is pasted onto the HVE strain sensor, and the strain change coupled to the strain sensor caused by magnetic field changes is detected by measuring the wavelength shift of the sensor. As the magnetic field strength is directly proportional to the current in the energized coil, this sensor can measure current. The experiment found that the current sensitivity of the sensor is 5.30 nm/A in the range of 0.5 A to 3.3 A, and the linear fitting coefficient is 0.9926. Additionally, the minimum measurable current change of the sensor is 23 mA, without hysteresis effects. The current sensor is of advantages of high sensitivity, stable sensing performance, compact structure, easy fabrication and low cost, meaning wide application prospect.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High sensitivity fiber optic current sensor based on Fabry–Perot interferometer manufactured by femtosecond laser

Hu,

Guo,

Jiang

et al. 2024

Meas. Sci. Technol.

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“…As the current measurement is implemented by calculating the circular-birefringence-caused phase difference resulting from the Faraday Effect, the measurement accuracy relies on the stability of the Verdet constant and polarization characteristics, which can be easily influenced by environmental disturbance. To improve stability, Crystals 2022, 12, 265 2 of 14 considerable efforts, including using a highly twisted low-birefringence fiber, utilizing a dual wavelength configuration, optimizing initial phase delay in the λ/4 wave plate, utilizing a coil of spun highly birefringent fiber, self-compensative with two sensing heads, using two toroidal permanent magnets, and other techniques, have been developed [15][16][17][18][19][20]. However, the problem has not been solved completely, but the sensor structure becomes more complex to some extent.…”

Section: Introductionmentioning

confidence: 99%

A LiNbO3 Integrated Optics Sensor for Measurement of Pulsed Current

Zhang

et al. 2022

Crystals

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A LiNbO3 integrated optics sensor fusing with an optical waveguide Mache–Zehnder interferometer (MZI), a loop-antenna, and a segmented electrode has been proposed, designed, and fabricated for the measurement of pulsed current. The experiment results have demonstrated that, for measurement of the standard 8/20 μs lightning pulsed current, the average of the front time and duration time of the sensor detected pulsed current waveform are 7.00 μs and 19.78 μs, respectively, while those detected by the Person CT are 7.30 μs and 20.35 μs, respectively. From 100 A to 3300 A, the sensor shows good linear characteristics, and the correlation coefficient is 0.9989. Moreover, the minimum detectable pulsed current is about 66 A in the time domain. All these results reveal the sensor can provide a new and potential technology for the measurement of pulsed current in the time domain.

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“…1 And with the development of power system to high capacity and extra high voltage, FOCT will also develop towards compact size, intellect and high reliability. 2,3 The FOCT can be divided into piezoelectric transducer (PZT) and direct waveguide modulated based on the differences in phase modulators, [4][5][6] which have certain advantages and disadvantages in practical applications. The direct waveguide based (typically lithium niobate) FOCT employs closed-loop modulation and the modulator is integrated in the electronic chassis inside the control protection chamber, which makes it insensitive to environmental perturbations.…”

Section: Introductionmentioning

confidence: 99%

The scattering characteristic analysis of various types of fiber used In FOCT through OFDR technology

Chen

Liu²,

Niu³

et al. 2022

Advanced Sensor Systems and Applications XII

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In the background of modern smart grid, fiber optic current transformer (FOCT) has become a research hotspot in power system because of its high accuracy, good dynamic performance and other excellent advantages. However, lower temperatures can easily lead to failures and shutdowns, which are extremely detrimental to the safety of the grid. In this paper, the optical frequency domain reflectometry (OFDR) technology is employed to investigate the scattering characteristic of fibers used in FOCT in massively variable temperature environments. The experimental results present the variation of optical loss of various optical fibers at different temperatures, which is particularly useful for further analyzing and investigating the low-temperature failure mechanisms of FOCT.

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Self-Compensative Fiber Optic Current Sensor

Cited by 20 publications

References 26 publications

High sensitivity fiber optic current sensor based on Fabry–Perot interferometer manufactured by femtosecond laser

High sensitivity fiber optic current sensor based on Fabry–Perot interferometer manufactured by femtosecond laser

A LiNbO3 Integrated Optics Sensor for Measurement of Pulsed Current

The scattering characteristic analysis of various types of fiber used In FOCT through OFDR technology

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