Sensing optical cable for gas pipeline leakage monitoring
A technology for sensing optical cables and gas pipelines, applied in pipeline systems, gas/liquid distribution and storage, fiber mechanical structures, etc., can solve the problems of leakage monitoring sensing optical cables, low sensitivity, leakage, etc. The effect of improving temperature sensitivity and increasing strain rate
Active Publication Date: 2022-07-29
NANJING UNIV
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Problems solved by technology
[0005] Based on the above technical problems, the present invention provides a sensing optical cable for gas pipeline leakage monitoring. Aiming at the problem of low sensitivity of the existing sensing optical cable, holes are regularly arranged on the surface of the porous sensitization elastic sheath structure. The structural method can effectively improve the sensitivity of the sensing optical cable, so that it can meet the requirements of high-precision monitoring of gas pipeline leakage
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[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.
[0029] Unless otherwise defined, technical or scientific terms used in this disclosure shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. As used in this disclosure, "first," "second," and similar terms do not denote any order, quantity, or importance, but are merely used t...
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Abstract
The invention discloses a sensing optical cable for monitoring leakage of a gas pipeline. The sensing optical cable comprises a strain sensing optical fiber, a temperature sensing optical fiber and a porous sensitization elastic sheath structure, the strain sensing optical fiber and the temperature sensing optical fiber are in a free state in the porous sensitization elastic sheath structure; and a plurality of through holes are distributed on the surface of the porous sensitization elastic sheath structure. The outer surface of the porous sensitization elastic sheath structure is plated with a metal sensitization layer, and the outer surface of the sensing optical cable used for gas pipeline leakage monitoring is provided with a woven mesh structure. The sensing optical cable for gas pipeline leakage monitoring has the advantages that the sensing sensitivity is remarkably improved, double-parameter measurement is achieved, the sound pressure sensitivity can be improved in order of magnitude, and the like. The sensing optical cable can be buried in a soil body to be used for long-time and high-sensitivity gas pipeline leakage monitoring.
Description
technical field [0001] The invention belongs to the technical field of distributed optical fiber sensing, in particular to a sensing optical cable used for gas pipeline leakage monitoring. Background technique [0002] Distributed Acoustic Sensing (DAS) is a sensing technology that utilizes the back Rayleigh scattering interference effect of optical fibers to achieve continuous distributed detection of acoustic signals. Optical fibers are generally made of extremely high-purity glass or plastic, but changes in various environmental factors during the production process and a very small amount of impurities in the optical fiber will cause the inside of the optical fiber to be not completely uniform, and these inhomogeneities are formed under the action of the incident laser. Scattering, of which the back Rayleigh scattering is the basis of distributed acoustic wave sensing technology. The slight deformation of the fiber changes the spacing and refractive index of the scatter...
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IPC IPC(8): F17D5/06G02B6/44
CPCF17D5/06G02B6/4415G02B6/443
Inventor 张丹付士崇孙梦雅彭阳刘春钱征宇马卓叶迪力·努尔兰
Owner NANJING UNIV