Alarm sensing system for distributed optical fiber oil and gas pipeline

A technology of distributed optical fiber and sensing system, which is applied in the pipeline system, gas/liquid distribution and storage, mechanical equipment, etc. It can solve the problems of high false alarm rate of M-Z interferometer, distance in practical application, and difficult positioning, etc., to achieve The effect of simple structure, low cost and high sensitivity

Inactive Publication Date: 2007-02-07
天津爱天光电子科技有限公司
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Problems solved by technology

[0009] In a word, the existing problems of the known technology are as follows: First, the optical time domain reflectometer (OTDR) and optical frequency domain reflectometer (OFDR) of the distributed optical fiber sensing system are not suitable for the oil and gas pipeline warning sensing system due

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  • Alarm sensing system for distributed optical fiber oil and gas pipeline
  • Alarm sensing system for distributed optical fiber oil and gas pipeline
  • Alarm sensing system for distributed optical fiber oil and gas pipeline

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[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] The principle of the invention is as figure 1 shown.

[0029] 1), light source: frequency scanning laser, the light (electric) field is: E=E 0 exp(2πνt)

[0030] During the measurement time, its frequency varies linearly with time: ν = ν 0 +αt

[0031] 2), sensing fiber:

[0032] A high-reflectivity fiber grating reflector 4 and a series of low-reflectivity fiber grating reflectors 5 are arranged in the optical fiber laid with the pipeline, and their spacing is respectively: the distance between the high-reflectivity fiber grating reflector 4 and the optical circulator 3 is L0, the distance between the high-reflectivity FBG reflector 4 and the first low-reflectivity FBG reflector is L1, the distance between the first low-reflectivity FBG reflector and the second low-reflectivity FBG reflector is L2, and so on for the rest.

[0033] 3), l...

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Abstract

The present invention belongs to the alarm technical field for the optical fiber oil and gas pipeline providing an alarm sensing system for distributed optical fiber oil and gas pipeline. The technical proposal of the invention is that: the coherent light emitted from the high coherent length tunable laser enters the input end a of the optical circulator through the sensing optical fiber, outputs to the optical fiber raster reflector entering from the first output end b of the optical circulator and the antiradar reflectivity optical fiber raster reflector, then returns to the optical circulator, outputs to the photodiode by the second output end c of the optical circulator. The signals of the photodiode is magnified by the amplifier and then analyzed the required information by the FFT sideband filter and the spectrum analyzer, finally displayed and prewarned by the computer control system and the prewarning. The invention is mostly used in the alarm sensing system for distributed optical fiber oil and gas pipeline which has simple manufacturing sturcture, accurate position, long monitoring distance, no large monitoring range, high sensitivity and can be set sensitivity in advance.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing and oil and gas pipeline alarm, in particular to a distributed optical fiber oil and gas pipeline alarm sensing system. Background technique [0002] Fiber optic and fiber grating sensors are new types of sensors that have developed rapidly in recent years. Fiber optic and fiber grating sensors can integrate information sensing and transmission. Compared with traditional sensors, it has many advantages: such as explosion-proof, anti-electromagnetic interference, anti- Corrosion, shock resistance, high temperature resistance, small size, light weight, flexible and convenient, especially for use in harsh environments. [0003] In addition to the above-mentioned advantages, the distributed optical fiber sensor can measure the signal at any point where the sensing fiber is located. Currently, optical time domain reflectometer (OTDR), optical frequency domain reflectometer (OFDR) and vari...

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Application Information

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IPC IPC(8): F17D5/02
Inventor 董苏姗郭转运孟凡勇张强
Owner 天津爱天光电子科技有限公司
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