Optical fiber detecting and positioning method for self-detection of protection cover damage
A protective jacket and optical fiber detection technology, which is applied in the directions of measuring heat, measuring devices, and using optical devices to transmit sensing components, etc., can solve the difficult problems of cable protective jacket damage detection and positioning, and achieve short detection time and improved detection accuracy Effect
Inactive Publication Date: 2009-09-16
CHONGQING UNIV
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[0004] Based on the above, the existing technology of damage detection of cable protection jacket is difficult to truly detect and locate the damage of cable protection jacket. With the large-scale use of cables in various infrastructures, in order to avoid the occurrence of vicious safety accidents, the It is increasingly important to detect and locate the local damage of the cable protective jacket, so it is extremely necessary to explore a new method for rapid distributed detection and location of the damage of the cable protective jacket
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[0018] The high-density polyethylene protective sheath 5 extruded outside the steel wire 1 not only protects the steel cable, but also isolates the temperature field of the outer space of the steel cable to a certain extent. Once the polyethylene protective jacket 5 (protective jacket) is destroyed, the protective jacket damage point 7 appears, the temperature isolation effect of the protective layer is destroyed, and the water-based substance invades the interior of the cable. Under the sun, the water-based substance volatilizes, and the temperature at the 7 points where the protective coat is damaged will change significantly, resulting in a temperature mutation point.
[0019] In order to realize the temperature measurement of the entire length and sides of the steel cable, the temperature measuring optical fiber 2 is buried in the entire length of the cable, and the temperature measuring optical fiber 2 is measured in a distributed manner by using the Raman or Brillouin dis...
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The invention discloses an optical fiber detecting and positioning method for self-detection of protection cover damage. The method uses a distributed optical fiber temperature sensing technology to process distributed measurement for temperature in the protection cover of cable and determines damage position of the protection cover of cable according to catastrophe points of temperature distribution; the invention further discloses a cable having self-detection of damage of protection cover, structure of which is that one or more temperature measuring optical fibers are pre-buried in periphery of the cable. Beneficial effects of the invention lie in that temperature measurement of full length on each side of the protection cover of cable realizes seamless detection on each side and full length of the protection cover of cable; the invention is short in detection time and high in probing accuracy, which improves safe operation state of bridges to a maximal extend and avoids malignant safety misadventure.
Description
technical field [0001] The invention relates to a damage point detection and positioning technology of a steel cable protective sheath, in particular to a cable and optical fiber detection and positioning method with the self-detection function of the protective sheath damage. Background technique [0002] At present, cables mainly protect steel wires by extruding high-density polyethylene plastics outside the steel wires. However, in the process of cable production, transportation, installation and use, the polyethylene plastic protective jacket is very likely to be damaged. Once the protective jacket is damaged, if the damaged part cannot be found in time and repaired, water-based substances can easily invade the interior of the cable, causing cable damage. Corrosion of the inner steel wire greatly reduces the local load-bearing characteristics of the steel wire, eventually causing local fracture of the cable, resulting in the occurrence of vicious safety accidents. [00...
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Login to View More IPC IPC(8): G01N25/00G01K11/32G01D5/26G01K11/322G01K11/324
Inventor 陈伟民吴俊章鹏刘琳
Owner CHONGQING UNIV