Optical fiber polarization sensing lightning positioning system and system based on space division multiplexing

Abstract

The invention discloses an optical fiber polarization sensing lightning positioning system based on space division multiplexing. The system comprises a first host and a second host, the first host andthe second host are connected through two optical fiber composite overhead ground wires. A first light source, a first circulator, a first filter, a first polarization analyzer and a first photoelectric detector of the first host are sequentially connected, and a second light source, a second circulator, a second filter and a second polarization analyzer of the second host are sequentially connected with a second photoelectric detector in the first host; the first photoelectric detector and the second photoelectric detector are connected with a high-speed acquisition card, and the high-speedacquisition card is connected with an upper computer; the first light source emits a direct-current optical signal with a first wavelength, the second light source emits a direct-current optical signal with a second wavelength, and the first wavelength is different from the second wavelength. According to the invention, thunder and lightning positioning and signal acquisition are achieved based ona method for double-end correlation single-end detection, so that the technical problems that the requirement of a traditional double-end method on a two-end time synchronization system is high and ameasurement dead zone exists in a single-end method are solved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and more particularly relates to an optical fiber polarization sensing lightning positioning system based on space division multiplexing. Background technique [0002] Optical Fiber Composite Overhead Ground Wire (OPGW) is a new type of ground wire that has emerged in recent years. It can be used as both a lightning protection wire and a communication trunk line. Due to its own communication characteristics, the lightning location can be performed through the OPGW itself. [0003] At present, there are few researches on the lightning detection of transmission lines based on OPGW at home and abroad, mainly Japanese scientists have carried out some theoretical research, and produced two major technical directions, one is the sensing technology based on Brillouin scattering, and the other is Sensing technology based on the polarization state of light. The first method is based on the...

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a fiber optic polarization sensing lightning location system and method based on space division multiplexing. The end method has higher requirements on the time synchronization system at both ends and there is a technical problem in the measurement dead zone in the single end method

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