A New Demodulation Method for Time Division Multiplexing System of Fiber-Optic Hydrophone Using a 3×3 Coupler

Huayong, 张华勇 Zhang; Liwei, 王利威 Wang; Qingping, 施清平 Shi; Changdong, 田长栋 Tian; Min, 张敏 Zhang; Yanbiao, 廖延彪 Liao

doi:10.3788/cjl201138.0505011

Cited by 4 publications

(1 citation statement)

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“…25 3D ellipse fitting method with singular value decomposition (SVD) solves the problem of inconsistent parameters calculated by 2D ellipse fitting. 26 3D ellipse fitting method with coordinate rotation is proposed for WFBG array demodulation, which does not depend on reference sensor and PZT and reduce the computation compared with SVD. The three outputs of the 3 × 3 coupler are used as coordinate components of 3D space (named SPI) to generate spatial ellipse.…”

Section: Articlementioning

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: Articlementioning

confidence: 99%