Extralong-distance sensing scattering enhanced sensing optical fiber

A technology of sensing optical fiber and distance sensing, which is applied in the direction of transmitting sensing components, cladding optical fibers, optical waveguides and light guides with optical devices, can solve the problems of weak backscattering and unstable scattering signals, and achieve high-precision positioning , The effect of real-time fast demodulation

Active Publication Date: 2019-05-24
HUAZHONG UNIV OF SCI & TECH
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[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

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  • Extralong-distance sensing scattering enhanced sensing optical fiber
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  • Extralong-distance sensing scattering enhanced sensing optical fiber

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[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0021] The invention provides a scattering-enhanced sensing optical fiber for ultra-long-distance sensing, such as figure 1 As shown, the optical fiber contains scattering enhancement points distributed at equal intervals along the axial direction to provide an enhanced and stable backscattered light signal. The connecting fiber between the scattering enhancement points serves as a sensing area, and the sensing fiber is The scattering enhancement point is divided into a plurality of independent sensing sections, namely, sensing section 1, sensing section 2, ... Sensing section N-1, where N is ...

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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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Application Information

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IPC IPC(8): G02B6/02G01D5/353
Inventor 闫志君张威孙琪真李晓磊刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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