Quasi-distributed temperature measurement optical cable built in smart cable

Abstract

The invention discloses a quasi-distributed temperature measurement optical cable built in a smart cable. The quasi-distributed temperature measurement optical cable comprises an outer sheath, a metallic armored layer, and a grating fiber merging tape. The metallic armored layer is disposed in the outer sheath. The grating fiber merging tape is disposed in the metallic armored layer and comprises multiple sensing fibers. The gratings of the sensing fibers are arranged in a staggered way in order that the density of temperature measurement points is set as required. The grating fiber merging tape increases the density of temperature measurement points on the temperature measurement optical cable, and solves a temperature measurement error due to over large deviation between the temperature measurement points and a heat source.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a quasi-distributed temperature measuring optical cable built in an intelligent cable. Background technique [0002] With the rapid development of the power network and the power industry, new requirements have been put forward for the safe operation of the power network and power consumption; specifically for cables, their safe operation and maintenance are inevitably more and more valued by the power system . During the operation of the cable, due to current overload or cable aging, the cable runs at high temperature, the insulation performance of the cable decreases, and it will be broken down in severe cases, which will eventually cause serious accidents such as cable fire and power supply system damage. At present, an optical fiber temperature measurement system that is compatible with cables is usually used to monitor the cable temperature. There are two tem...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the distance between quasi-distributed temperature measurement points of the existing large-capacity, long-distance weak fiber grating sensor array is relatively large, and when used for cable temperature measurement, there may be a large deviation between the measurement point and the heat source, resulting in inaccurate measurement. Accurate defects, the present invention adopts the mature banding technology to glue multiple sensing optical fibers into a temperature measuring belt, and the gratings on the multiple sensing optical fibers are mutually misaligned and arranged at equal intervals, thereby improving the large-capacity, long-distance weak fiber grating transmission. The density of measuring points for sensing temperature is used as a built-in temperature measuring optical cable to ensure fast and accurate temperature measurement of the entire cable

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