Intensity Compensation of Echo Pulses for Fiber Interferometers Based on uwFBG Reflectors

Pang, Yandong; Huang, Junbin; Gu, Hongcan; Wu, Shaohua; Zhang, Zhiqiang

doi:10.1109/ogc55558.2022.10050925

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…3 The presence of extreme weather can lead to uneven icing on power transmission lines, which under strong wind stimulations, can easily generate multi-period and low-frequency line galloping. 4 When parts of the power transmission line are in a swaying state, it can easily lead to line damage, resulting in power outages and tripping accidents. 5 To prevent transmission line accidents, real-time health monitoring of high-frequency prone areas can estimate the current motion and stress status of the optical cable, 6,7 providing a successful case for line deicing prevention.…”

Section: Introductionmentioning

confidence: 99%

High precision three-dimensional ellipse fitting correction for galloping monitoring

Ma,

Zhang,

Dai

et al. 2024

AIP Advances

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In this paper, we propose and demonstrate a high precision three-dimensional (3D) ellipse fitting correction method for optical fiber composite overhead ground wire (OPGW) galloping monitoring, based on weak fiber Bragg grating array. 3D ellipse formed by three outputs of the system is fitted by the coordinate rotation and least square methods, and direct current (DC) components and alternate current (AC) component coefficients of the three outputs are obtained. By differentiating and cross-multiplying the three outputs, those DC components are zeroized, AC component coefficients are normalized, and finally, the interference phase signal is calculated. The experimental results show that the proposed method can demodulate the vibration signals better, and the fitted R2 is above 0.99. The system is implemented on a 220 kV transmission line in the plateau region of Western China, forecasting a galloping period with a wavelength of about 60 m within the span accurately. This method demonstrates suitability for monitoring OPGW transmission line galloping events.

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Section: Introductionmentioning

confidence: 99%

High precision three-dimensional ellipse fitting correction for galloping monitoring

Ma,

Zhang,

Dai

et al. 2024

AIP Advances

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“…However, compared with traditional security prediction, this technology can effectively improve the sensitivity of event monitoring, but also increase the false alarm rate of the system, so that the monitoring technology has to be improved in the terms of the classification and recognition algorithm [8]. Inspired by the above techniques, researchers combined ultraweak fiber Bragg grating (uwFBG) with coherence detection technology [9,10], to improve the monitoring effect of intrusion events. Owing to the fact that uwFBG is written by the laser in one exposure, the reflectivity is usually less than −30 dB.…”

Section: Introductionmentioning

confidence: 99%

Intrusion Monitoring Based on High Dimensional Random Matrix by Using Ultra-Weak Fiber Bragg Grating Array

Huang

et al. 2023

Photonics

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In order to ensure that a perimeter security system can work effectively, a convenient and effective event detection algorithm has an important engineering significance. Given the above background, in this paper, we propose a high reliability intrusion event recognition method and vibration sensing system, based on ultra-weak fiber Bragg grating array, by using high dimensional random matrix. We obtain a high sensitivity optical interference signal by constructing a patch-matched optical interference system, then compose the demodulated interference signal into a high-dimensional random matrix. The statistical characteristics of the matrix for the Marcenko-Pastur (M-P) law and ring law are used to confirm the presence of intrusion events efficiently, which can reflect the limit spectrum distribution of the high-dimensional random matrix; meanwhile, the abnormal state quantity and moment are obtained. Further, the average spectral radius value is used to judge the fault cause. Field experimental results show that the proposed method can effectively obtain the correct monitoring data for the sensor array. By comparing the monitoring results of normal operation and crusher operation, we can detect the intrusion event in 4.5 s, and the accuracy rate can reach more than 90%, which verifies that the proposed high-dimensional random matrix analysis method can work properly, proving a practical engineering application prospect.

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Intensity Compensation of Echo Pulses for Fiber Interferometers Based on uwFBG Reflectors

Cited by 2 publications

References 18 publications

High precision three-dimensional ellipse fitting correction for galloping monitoring

High precision three-dimensional ellipse fitting correction for galloping monitoring

Intrusion Monitoring Based on High Dimensional Random Matrix by Using Ultra-Weak Fiber Bragg Grating Array

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