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High-sensitivity sensing device and method based on secondary Brillouin scattering

A Brillouin scattering and sensing device technology, which is applied in the direction of measuring devices, optical devices, and converting sensor output, etc., can solve the problem that the measurement accuracy is difficult to meet higher requirements, and the sensitivity of the first-order Brillouin scattering signal is limited. problems, to achieve real-time monitoring and improve measurement accuracy

Active Publication Date: 2021-07-09
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing Brillouin sensing technologies are all based on the first-order Brillouin scattering sensing device. Due to the inherent characteristics of the first-order Brillouin scattering, although the above method can improve the measurement accuracy of the Brillouin frequency shift Measurement accuracy, but limited by the sensitivity of the first-order Brillouin scattering signal, it is difficult to meet higher requirements for measurement accuracy

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Embodiment 1

[0035] like figure 1 As shown, Embodiment 1 of the present invention provides a kind of highly sensitive sensing device based on second-order Brillouin scattering, comprising: narrow linewidth laser 1, first erbium-doped fiber amplifier 2, beam splitter 3, first optical ring Device 4, first optical filter 5-, reference fiber 6, second erbium-doped fiber amplifier 7, second optical circulator 8, optical coupler 9, photodetector 10, spectrum analyzer 11, pulse generator 12, A first modulator 13 , a third optical circulator 14 , a second optical filter 15 , a sensing fiber 16 , a second modulator 17 , a pulsed optical amplifier 18 and a fourth optical circulator 19 .

[0036]The output end of the narrow linewidth laser 1 is connected to the optical splitter 3, the first output end of the optical splitter 3 is connected to the first port of the first optical circulator 4, and the second port of the first optical circulator 4 is connected to the reference fiber One end of 6 is con...

Embodiment 2

[0051] The second embodiment of the present invention provides a highly sensitive sensing method based on secondary Brillouin scattering, including the following steps:

[0052] S1. Divide the narrow linewidth laser signal output by the same laser into two channels;

[0053] S2. One of the optical signals is used as the reference optical signal, and the second optical signal is used as the sensing light; the reference light enters the reference fiber and spontaneous Brillouin scattering occurs in the reference fiber, and the generated Brillouin backscattered reference light is regenerated The reverse input to the reference fiber makes Brillouin scattering occur again, and the generated secondary Brillouin backscattered reference light is output; the other signal is used as the sensing light, and after the sensing light is modulated by the first modulator into pulse light, The pulsed sensing light enters the sensing fiber and spontaneous Brillouin scattering occurs in the sensi...

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Abstract

The invention belongs to the technical field of distributed optical fiber sensing, and discloses a high-sensitivity sensing device and method based on secondary Brillouin scattering, and the method comprises the following steps: dividing a narrow linewidth laser signal output by the same laser into two paths; one optical signal is used as a reference optical signal, and the second optical signal is used as sensing light; the reference light enters a reference optical fiber and generates spontaneous Brillouin scattering, the generated Brillouin backscattering reference light is reversely input into the reference optical fiber again to generate Brillouin scattering again, and secondary Brillouin backscattering reference light is output; the other path of Brillouin backscattering sensing light is used as sensing light, the sensing light is modulated into pulsed light, the pulsed light enters a sensing optical fiber, the generated Brillouin backscattering sensing light is subjected to pulse modulation again through a second modulator, then the Brillouin backscattering sensing light is reversely input into the sensing optical fiber again, and secondary Brillouin backscattering sensing light is output; and the beat frequency signal is collected and analyzed, and temperature / strain information in the sensing optical fiber is demodulated. The measurement precision of the system can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of distributed optical fiber sensing systems, and in particular relates to a high-sensitivity sensing device and method based on secondary Brillouin scattering. Background technique [0002] Compared with traditional sensing systems, distributed optical fiber sensing has the advantages of light weight, corrosion resistance, and anti-electromagnetic interference. The optical fiber itself is used not only as a sensor, but also as a signal transmission medium to achieve continuous and long-distance sensing. The sensor network composed of optical fibers can realize the sensing and measurement of a large area. It has significant advantages in the application of oil pipelines and structural health monitoring of large buildings. The distributed optical fiber sensing technology based on Brillouin scattering can realize high-precision temperature and strain measurement by using the linear relationship between Brillo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01K11/322G01B11/16
CPCG01D5/35364G01K11/32G01B11/16
Inventor 王涛陈欢张倩张明江张建忠乔丽君高少华赵婕茹刘靖阳
Owner TAIYUAN UNIV OF TECH