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Continuous optical wavelength division multiplexing long-distance distributed disturbance positioning device and method

A technology of disturbance positioning and wavelength division multiplexer, which is applied in the direction of using optical devices to transmit sensing components, measuring devices, and anti-theft alarm mechanical start-ups. cost effect

Active Publication Date: 2013-07-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the need to bury three optical fibers at the same time during actual construction, it not only increases the cost of the system, but also greatly increases the difficulty of system construction.

Method used

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  • Continuous optical wavelength division multiplexing long-distance distributed disturbance positioning device and method

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Embodiment 1

[0020] A continuous optical wavelength division multiplexing type long-distance distributed disturbance positioning device, comprising a first broadband light source 1 and a second broadband light source 2 with different central wavelengths of emitted waves, a first wavelength division multiplexer 3, a second wavelength division Multiplexer 8, third wavelength division multiplexer 11, first fiber coupler 4, second fiber coupler 6, fiber delay line 5, mirror 9, refractive index matching liquid 10 and sensing fiber 7; the first The bidirectional optical ports of the broadband light source 1 and the second broadband light source 2 are respectively connected with the first bidirectional optical port 3a of the first wavelength division multiplexer 3 and the second bidirectional optical port 3b of the first wavelength division multiplexer 3; The third bidirectional optical port 3c of the wavelength division multiplexer 3 is connected with the first bidirectional optical port 4a of th...

Embodiment 2

[0022] A continuous optical wavelength division multiplexing type long-distance distributed disturbance positioning method, the central wavelength emitted by the first broadband light source 1 is λ 1 The light and the wavelength emitted by the second broadband light source 2 are λ 2The light is respectively sent into the first bidirectional optical port 3a of the first wavelength division multiplexer 3 and the second bidirectional optical port 3b of the first wavelength division multiplexer 3, and the optical signals containing different wavelengths are transmitted from the first wavelength division multiplexer 3 output in the third bidirectional optical port 3c of the multiplexer 3, and send into the first optical fiber coupler 4 through the first bidirectional optical port 4a of the first optical fiber coupler 4, and the light is split in the first optical fiber coupler 4 For two, a part of light is sent into a bidirectional optical port of the optical fiber delay line 5 thr...

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Abstract

The invention discloses a continuous optical wavelength division multiplexing long-distance distributed disturbance positioning device and a method. Optical fibers are used for realizing long-distance distributed disturbance sensing and positioning. Two broadband light sources respectively emit light with center wavelength being lambda 1 and lambda 2, the light is fed into the optical fibers through wavelength division multiplexers, two independent interference light paths are respectively formed and interference light signals of the interference light paths are respectively received by two sets of independent photoelectric detection circuits. For the interference light signals with center wavelength being lambda 2, under the effects of a tail-end wavelength division multiplexer and refractive index matching fluid, light signal reflection does not exist. Therefore, the interference light signals are backscattered signals in sensor optical fibers and contain disturbance points, disturbance characteristics and position information of the disturbance points. For the interference light signals with center wavelength being lambda 1, under the effects of an optical fiber tail-end wavelength division multiplexer and a reflecting mirror, the signals only contain the disturbance characteristic information of the disturbance points. By dividing the light signals of one interference light path by the light signals of the other interference light path, the position information of the disturbance points can be obtained.

Description

Technical field [0001] The design of the invention is the field of optical fiber sensing and security monitoring.Especially engineering and equipment involving long -distance distributed safety monitoring.Can detect and position the vibration of the monitoring area. Background technique [0002] For residential residential communities and facilities with major value, such as dams, oil, natural gas pipelines, warehouses, museums, and even national borders, the demand for safety protection is increasing.These facilities and goals with significant value, once it is damaged by the illegal parts, will cause significant destruction to the safety of the people's life and property and the safety of the country, so it is urgent to carry out effective security protection. [0003] At present, the applications for security monitoring systems are more widely infrared.Although the solution is simple and cheap, it is easy to be found by the invaders, so that the invaders can avoid the monitori...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26G01H9/00G08B13/02
Inventor 孙小菡韦朴单雪康
Owner SOUTHEAST UNIV