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Single-ended Brillouin distributed-type sensing system of Brillouin adjustable frequency shifter structure, and sensing method

A sensing system and distributed technology, applied in the direction of using optical devices to transmit sensing components, instruments, measuring devices, etc., can solve problems such as increased system cost and inconvenience in use.

Pending Publication Date: 2018-03-06
GUANGXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the traditional BOTDA system, light sources need to be injected at both ends of the light, so the effective sensing distance of the system is only half of the nominal sensing distance. At the same time, it is not convenient to use light sources injected at both ends in actual measurement. In addition, the traditional BOTDA technology It is necessary to sweep the frequency difference between the local oscillator light and the probe light. For this reason, a high-frequency microwave signal source and an electro-optic frequency shifter with a high extinction ratio are required to shift the frequency of the local oscillator light or probe light in order to realize the sweep of the Brillouin gain spectrum. frequency measurement, which greatly increases the cost of the system

Method used

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  • Single-ended Brillouin distributed-type sensing system of Brillouin adjustable frequency shifter structure, and sensing method
  • Single-ended Brillouin distributed-type sensing system of Brillouin adjustable frequency shifter structure, and sensing method
  • Single-ended Brillouin distributed-type sensing system of Brillouin adjustable frequency shifter structure, and sensing method

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Embodiment

[0037] refer to figure 1 , figure 2 , a single-ended Brillouin distributed sensing system with a Brillouin tunable frequency shifter structure, including:

[0038] Narrow linewidth laser 1, first optical coupler 2, erbium-doped fiber amplifier 3, second optical coupler 11, second optical circulator 12;

[0039] A signal processing unit 20, the signal processing unit 20 includes a photodetector 15 and a data acquisition and processing module 16 connected in sequence;

[0040] A single-ended structural unit 19, the single-ended structural unit 19 includes a sensing optical fiber 13 and an FC / PC optical connector 14 connected together;

[0041] A pulse modulation unit 18, the pulse modulation unit 18 is provided with a pulse modulator 10, and the pulse modulator 10 modulates the frequency-shifted continuous light into pulsed pump light;

[0042] Adjustable frequency shifting unit 17, the adjustable frequency shifting unit 17 includes the first optical circulator 4, the third op...

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Abstract

The invention discloses a sensing method of a single-ended Brillouin distributed-type sensing system of a Brillouin adjustable frequency shifter structure. The method includes 1), generating continuous detection light; 2) generating pulse pump light; 3), generating stimulated Brillouin effect; 4), generating backscattering signal light; 5) collecting and processing data. The sensing method has theadvantages that by the single-end structure, measurement distances in BOTDA (Brilouin optical time domain analysis) can be effective measurement distances; the sensing system has longer effective measurement distances than gain-type BOTDA systems. The invention further discloses the single-ended Brillouin distributed-type sensing system of the Brillouin adjustable frequency shifter structure.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a single-end Brillouin distributed sensing system and a sensing method with a Brillouin adjustable frequency shifter structure. Background technique [0002] Optical fiber Brillouin optical time-domain analysis technology (BOTDA) is a distributed optical fiber sensing technology based on the stimulated Brillouin scattering (SBS) effect. The traditional optical fiber sensor based on the Brillouin scattering effect requires a beam of pump The pump light (pulse light) and a probe light (continuous light) are respectively injected into both ends of the fiber. When the frequency difference between the two beams of light is within the range of Brillouin gain, the stimulated Brillouin interaction occurs between the two beams of light. Generate energy transfer, when the frequency difference between the pump light and the probe light is equal to the Brillouin frequency shift...

Claims

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Application Information

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IPC IPC(8): G01D5/353G01D21/02
Inventor 胡君辉曹雄恒张帆龙萍
Owner GUANGXI NORMAL UNIV
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