Magnetic sensitive optical cable, making method and distributed optical fiber acoustic sensing magnetic field detection system
A detection system and magnetic sensitivity technology, applied in the field of magnetic field detection, can solve problems such as limited sensing scale, system reliability decline, and inability to meet magnetostrictive material sputtering.
Inactive Publication Date: 2018-08-21
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology
The cost of magnetron sputtering technology is high, and it can only achieve short-distance (several centimeters long) magnetostrictive material sputtering, which cannot meet the sputtering of several kilometers of bare optical fiber magnetostrictive material
In addition, the traditional interferometric optical fiber magnetic sensor array can only provide several or dozens of magnetic sensing units, and the sensing scale is limited. The main reason is that the complexity and cost of the system increase significantly with the increase in the size of the optical fiber magnetic sensing unit. , and the system reliability will drop significantly
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[0035] The present disclosure provides a magnetically sensitive optical cable, a manufacturing method, and a distributed optical fiber acoustic sensing magnetic field detection system, which have significant advantages such as simple structure and low cost, and can realize long-distance large-scale spatially continuous magnetic field measurement, overcoming the traditional optical fiber magnetic field detection system. The unit of the sensing system is small in size and can only meet the shortcomings of single or local magnetic field measurement.
[0036] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0037]Certain embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which some but not all embodimen...
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The invention provides a magnetic sensitive optical cable for distributed optical fiber acoustic sensing, which comprises a single-mode optical fiber, a tight casing and a rubber coating containing magnetic powder, wherein the single-mode optical fiber is used for transmitting pulse light emitted by a distributed optical fiber acoustic sensing demodulator and generating reverse Rayleigh scatteringlight; the tight casing sleeves the outer layer of the single-mode optical fiber to enable the micro bending loss sensitivity of the optical fiber to be reduced and transfer stress; and the rubber coating containing magnetic powder coats the tight casing. The magnetic sensitive optical cable converts magnetic field changes at any spatial position to optical fiber backward Rayleigh scattering light phase changes in the optical cable, the Rayleigh scattering light phase information at any position in the optical fiber is demodulated through a distributed optical fiber acoustic sensing technology, and space-continuity distributed magnetic field measurement is further realized, and the defects that the traditional optical fiber acoustic sensing system unit has a small scale, single or local magnetic field measurement can only be met and the like.
Description
technical field [0001] The invention relates to the field of magnetic field detection, in particular to the application of long-distance large-scale high-spatial resolution dynamic magnetic field measurement, and in particular to a magnetically sensitive optical cable, a manufacturing method and a distributed optical fiber acoustic sensing magnetic field detection system. Background technique [0002] Magnetic field sensors are widely used in seismology, geophysics, acoustics, aerospace engineering, biomedicine and other scientific fields. They use high-sensitivity ground magnetic field detection methods to find mineral resources or magnetic field sources. "Magnetocardiogram" and "magnetoencephalogram" are used to diagnose diseases, and to sense changes in current in high-voltage transmission lines by measuring magnetic fields. In addition, weak magnetic field measurement technology is also one of the most applicable technologies for geomagnetic routines and earthquake predic...
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IPC IPC(8): G01R33/032
CPCG01R33/032
Inventor 徐团伟冯圣文黄建芬杨洋李芳
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI