System and method for improving anti-radiation capability of BOTDR (Brillouin Optical Time-Domain Reflectometry)

A radiation-resistant and capable technology, applied in the field of distributed optical fiber sensing, to achieve the effect of reducing absorption coefficient, reducing radiation damage, and reducing fiber loss

Active Publication Date: 2016-06-15
NANJING UNIV
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Problems solved by technology

The loss of optical fiber caused by radiation will have adverse effects

Method used

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  • System and method for improving anti-radiation capability of BOTDR (Brillouin Optical Time-Domain Reflectometry)
  • System and method for improving anti-radiation capability of BOTDR (Brillouin Optical Time-Domain Reflectometry)
  • System and method for improving anti-radiation capability of BOTDR (Brillouin Optical Time-Domain Reflectometry)

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Embodiment Construction

[0040] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0041] Such as figure 1 As shown, the present invention designs a system for improving the anti-radiation ability of BOTDR, including a light source module, a first coupler, an optical polarization perturbation module, an electro-optical modulation module, an interval sequence generation module, an optical pulse amplification module, a circulator, an optical fiber, The second coupler (50:50), light detection module, frequency sweep module, filter module, amplification module, signal processing module, wherein,

[0042] a light source module, configured to output continuous light to the first coupler;

[0043] The first coupler is used to divide the continuous light into two paths (90:10): the first path is used as the continuous light of the detection and the second path is used as the continuous light of the local oscillator; the first path of co...

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Abstract

The invention discloses a method for improving the anti-radiation capability of a BOTDR. According to the characteristics that loss of sensing fibers is increased and the action range of Brillouin backward scattering light signals is decreased in the radiation environment, a light pulse sequence is input to the radiated fiber at interval, so that the radiated fiber is full of the light pulse sequence at interval, the Brillouin backward scattering light signals of higher signal to noise ratio are obtained in the interval segments, splicing recombination and matrix transformation coding are carried out on the signals collected in the interval segments, and system response to the whole fiber is obtained. The temperature or strain is sensed according to the relation between Brillouin frequency shift and the frequency/strain. The invention also discloses a system for improving the anti-radiation capability of the BOTDR. The fiber is full of the light pulse sequence at interval, so that the input power is improved, fiber loss caused by radiation is reduced, and the anti-radiation capability of the fiber is improved. Adverse influence caused by fiber loss is avoided, and the anti-radiation capability of the BOTDR system is improved.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensing, in particular to a system and method for improving the anti-radiation capability of BOTDR. Background technique [0002] With the development of science and technology, the pace of human exploration of the universe continues to advance, and more and more spacecraft are used for scientific experiments in outer space. The subject of spacecraft protection in harsh space environments has also attracted more and more attention. For example, the International Space Station has a complex structure and a large scale. It is composed of the astronaut living module, experimental module, service module, docking transition module, truss, solar cells and other parts. The monitoring and protection of these components not only provide protection for the safety of personnel on the station, but also Moreover, finding and solving problems in time can greatly increase the service life of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D3/028
CPCG01D3/028
Inventor 李密陈章张旭苹宋跃江李鑫刘阳
Owner NANJING UNIV
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