Mr. Jihui Li Profile

Jihui Li

at China Jiliang Univ

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Publications (2)

Proceedings Article | 20 December 2013 Paper

Research on distributed strain separation technology of fiber Brillouin sensing system combining an electric power optical fiber cable

Yuqing Lei, Xi Chen, Jihui Li, Jie Tong

Proceedings Volume 9044, 904416 (2013) https://doi.org/10.1117/12.2037490

KEYWORDS: Temperature metrology, Raman spectroscopy, Sensing systems, Optical fibers, Data processing, Optical fiber cables, Sensors, Light scattering, Telecommunications, Multimode fibers

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Brillouin-based optical fiber sensing system has been taken more and more attentions in power transmission line in recent years. However, there exists a temperature cross sensitivity problem in sensing system. Hence, researching on strain separation technology of fiber brillouin sensing system is an urgent requirement in its practical area. In this paper, a real-time online distributed strain separation calculation technology of fiber Brillouin sensing combining an electric power optical fiber cable is proposed. The technology is mainly composed of the Brillouin temperature-strain distributed measurement system and the Raman temperature distributed measurement system. In this technology, the electric power optical fiber cable is a special optical phase conductor (OPPC); the Brillouin sensing system uses the Brillouin optical time domain analysis (BOTDA) method. The optical unit of the OPPC includes single-mode and multimode fibers which can be used as sensing channel for Brillouin sensing system and Raman sensing system respectively. In the system networking aspect, the data processor of fiber Brillouin sensing system works as the host processor and the data processor of fiber Raman sensing system works as the auxiliary processor. And the auxiliary processor transfers the data to the host processor via the Ethernet interface. In the experiment, the BOTDA monitoring system and the Raman monitoring system work on the same optical unit of the OPPC simultaneously; In the data processing aspect, the auxiliary processor of Raman transfers the temperature data to the host processor of Brillouin via the Ethernet interface, and then the host processor of Brillouin uses the temperature data combining itself strain-temperature data to achieve the high sampling rate and high-precision strain separation via data decoupling calculation. The data decoupling calculation is achieved through the interpolation, filtering, feature point alignment, and the singular point prediction algorithm etc. Testing in the laboratory and the transmission line test base all show that the simultaneous temperature and strain distribution measurement system can work effectively and reliably. This system provides a good solution reference to solve the temperature cross sensitivity problem in Brillouin-based optical fiber sensing system, and demonstrate a great practical value in power system applications.

Proceedings Article | 7 November 2012 Paper

Simultaneous multi-point measurement of refractive index using optical fiber sensor based on an arrayed-waveguide grating

Ji-Hui Li, Chun-Liu Zhao, Chong-Ke Ji

Proceedings Volume 8421, 84219N (2012) https://doi.org/10.1117/12.974261

KEYWORDS: Refractive index, Head, Sensors, Interfaces, Fiber optics sensors, Reflection, Reflectivity, Channel projecting optics, Water, Optical fibers

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