Optical fiber breakpoint monitoring device based on phase sensitive optical time domain reflection technology

Abstract

The invention discloses an optical fiber breakpoint monitoring device based on a phase sensitive optical time domain reflection technology, wherein the optical fiber breakpoint monitoring device is connected with a sensing optical fiber. The device comprises a laser being driven by a driving circuit and used for emitting initial laser, a pulse modulator formodulating formulating the initial laserlight, an EDFA being connected with the pulse modulator and being used for amplifying the modulated initial laser, a WDM being connected with the EDFA and being used for coupling the modulated initiallaser to a sensing optical fiber, and an acquisition unit being connected with the WDM and the sensing optical fiber and being used for acquiring photoelectric information and analyzing the photoelectric information through a phase sensitive optical time domain reflection technology. When the sensing optical fiber is vibrated, back rayleigh scattering light returned by strong coherent light injected into the optical fiber is utilized; a backward Rayleigh scattering light signal with vibration information is acquired through a wavelength division multiplexing module and an acquisition power supply, the real-time vibration information is demodulated through signal processing, and the actual geographical position of the optical fiber breakpoint is judged through the actual geographical position information of the vibration source, so that the optical fiber breakpoint is located.

Description

Technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber breakpoint monitoring device based on phase-sensitive optical time domain reflection technology. Background technique [0002] Cables are important energy transmission equipment for various industrial production and civil industries such as electric power, steel, petrochemical, and transportation. Their safe operation is an issue that all industries attach great importance to, and how to prevent cables from being damaged is a top priority. Fiber optic vibration sensor is a new technology in vibration measurement technology and one of the most used sensors in the industry. The emergence of distributed optical fiber vibration sensors greatly reduces the cost of obtaining unit information, which is undoubtedly a revolution for vibration sensors based on electrical signals. Distributed optical fiber vibration sensing technology uses optical fiber to measure...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the prior art has poor effect in locating fiber breakpoints, the present invention provides a fiber breakpoint monitoring device based on phase-sensitive optical time-domain reflection technology, which utilizes phase-sensitive optical time-domain reflection technology and Rayleigh scattering phenomenon , judge the actual geographical location of the fiber breakpoint through the actual geographic location information of the vibration source, so as to locate the fiber breakpoint

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