A scattering-enhanced sensing fiber for ultra-long-distance sensing

Abstract

The invention discloses an extralong-distance sensing scattering enhanced sensing optical fiber. The extralong-distance sensing scattering enhanced sensing optical fiber comprises a plurality of scattering enhancing points axially distributed to provide stable enhanced back scattering signals; the reflectivity of the scattering enhancing points is gradually increased in the length direction of theextralong-distance sensing scattering enhanced sensing optical fiber, the connecting fibers among the scattering enhancing points serve as sensing areas, and the extralong-distance sensing scatteringenhanced sensing optical fiber is divided into multiple independent sensing sections by the scattering enhancing points. According to the extralong-distance sensing scattering enhanced sensing optical fiber, the reflectivity of the fiber core of a common single mode optical fiber is modulated through laser exposure so that the ultrawide-band reflective scattering enhancing points can be formed inthe reflectivity modulating area of the fiber core, and the interval and the reflectivity of the scattering enhancing points can be controlled by controlling the moving speed of the optical fiber, the time of laser exposure and the intensity of laser exposure. The extralong-distance sensing scattering enhanced sensing optical fiber can provide stable enhanced back scattering signals, saves multiple optical signal averaging during sensing detection and helps achieve extralong-distance, rapidly-demodulated and high-positioning-precision distributed sensing.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and more specifically relates to a scattering-enhanced sensing optical fiber for ultra-long-distance sensing. Background technique [0002] Optical fiber sensing technology has risen rapidly since the invention of optical fiber in the 1970s. After decades of research and development, it has been widely used in many fields. It has the characteristics of miniaturization, anti-electromagnetic interference, corrosion resistance, and can measure many physical quantities. It is more suitable for detecting information in harsh environments and has the ability of distributed sensing and long-distance sensing, so distributed optical fiber sensing technology has become a research hotspot in recent years. Distributed optical fiber sensing technology can make the optical fiber along the route become a sensitive element, which can obtain the measured information parameters in the entire sensing ...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the present invention proposes a scattering-enhanced sensing optical fiber for ultra-long-distance sensing, aiming at solving the problem of weak backscattering and scattered signal in the single-mode optical fiber in the long-distance distributed sensing system. unstable problem

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