Simultaneous temperature and vibration sensing based on hybrid BOTDR and Φ-OTDR

Zhou, Xiao; Li, Haitao; Wang, Feng; Li, Shiyi; Li, Jingzeng; Li, Hao; Yuan, Xinyu; Zhang, Yixin; Zhang, Xuping

doi:10.1117/12.2584955

Cited by 2 publications

(1 citation statement)

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“…The traditional distributed fiber fusion system scheme is to modulate the continuous light output of the laser into pulsed light and inject it into the fiber to be measured, the received reflected light contains Brillouin scattering signal and Rayleigh scattering signal, and one sideband of Brillouin scattered light is filtered out by DWDM for BOTDR measurement, and the remaining Rayleigh scattered light and another sideband of Brillouin scattered light are used for φ-OTDR measurement [4]. Due to the high requirements of BOTDR on the power and wavelength adjustable range of the light source, while the φ-OTDR has high requirements on the wavelength stability and linewidth of the light source, it is difficult to meet the measurement requirements of BOTDR and φ-OTDR systems at the same time with a single light source, resulting in the degradation of the performance of the fusion system.…”

Section: Introductionmentioning

confidence: 99%

Distributed optical fiber fusion sensing system based on dual light source and pulse precision delay technology

Tang,

Li,

Meng

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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This paper proposes a Brillouin and Rayleigh fusion system for multi-parameter monitoring of power OPGW cables. Temperature, strain, and vibration measurements are important indicators for safe cable operation of OPGW cables. Temperature monitoring helps detect ice-coating, mountain fire, and lightning. Strain measures cable stress, fiber core safety, ice-coating, and fatigue damage caused by wind-induced vibrations. Vibration monitoring is useful for ice covering and wind vibration. The proposed system overcomes limitations such as nonlinear effects and limited sensing distance. By using a fixed delay of 500ns, mutual position calibration of temperature/strain and vibration measurements is achieved. The system uses a two-wavelength distributed optical fiber fusion scheme with dual light sources, ensuring no interference or degradation due to index conflicts.

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Section: Introductionmentioning

confidence: 99%