Dynamic distributed Brillouin optical fiber sensing device and method

An optical fiber sensing and distributed technology, applied in the direction of using optical devices, using optical devices to transmit sensing components, measuring devices, etc., can solve the problems of fluctuations in measurement accuracy, and achieve high dynamic event measurement, long sensing distance, The effect of high measurement accuracy

Inactive Publication Date: 2015-06-03
GUANGXI NORMAL UNIV
View PDF6 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] What the present invention aims to solve is the problem that the measurement accuracy is seriously affected by the fluctuation of the pump light power in the Brillouin gain slope method BOTDA dynamic sensing technology, and provides a dynamic distributed sensor based on

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dynamic distributed Brillouin optical fiber sensing device and method
  • Dynamic distributed Brillouin optical fiber sensing device and method
  • Dynamic distributed Brillouin optical fiber sensing device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] A dynamic distributed Brillouin fiber optic sensing device, such as figure 1 As shown, it includes a narrow linewidth laser 01, a polarization maintaining coupler 02, a coupler 03, a first electro-optical intensity modulator 04, a pulse signal generator 05, a frequency shifter 06, an optical amplifier 07, a polarization scrambler 08, and an optical ring shaper 09, polarization controller 10, second photoelectric intensity modulator 11, microwave signal source 12, sensing fiber 13, 3dB coupler 14, balanced photodetector 15 and data acquisition and processing module 16.

[0032] The output end of the narrow linewidth laser 01 is connected to the input end of the polarization maintaining coupler 02, and the two output ends of the polarization maintaining coupler 02 are respectively connected to the input end of the first electro-optical intensity modulator 04 and the input end of the coupler 03;

[0033]The pulse signal generator 05 is directly connected to the radio frequ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a dynamic distributed Brillouin optical fiber sensing device and method. The dynamic distributed Brillouin optical fiber sensing device comprises a narrow linewidth laser, a polarization-maintaining coupler, a coupler, a first electro-optic intensity modulator, a pulse signal generator, a frequency shifter, an optical amplifier, a polarization scrambler, an optical circulator, a polarization controller, a second electro-optic intensity modulator, a microwave signal source, a sensing optical fiber, a 3dB coupler, a balanced photoelectric detector and a data acquisition and processing module. Two technologies including a Brillouin gain spectrum dual-slope frequency point assisted method and a coherent detection technology are adopted at the same time. The coherent detection technology can increase the signal-noise ratio of a system, improve the measurement precision and increases the sensing distance; the Brillouin gain spectrum dual-slope frequency point assisted method solves a problem of influence of optical power fluctuation of a pumping pulse on the measurement precision in a conventional Brillouin gain spectrum slope frequency point assisted method. Therefore, the dynamic distributed Brillouin optical fiber sensing device and method can realize dynamic event measurement with relatively high measurement precision while guaranteeing that the Brillouin optical fiber sensing system has relatively long sensing distance.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a dynamic distributed Brillouin optical fiber sensing device and method. 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 effect. ) are respectively injected into both ends of the fiber, when the frequency difference of the two beams of light is within the range of Brillouin gain, energy transfer occurs between the two beams of light due to the stimulated Brillouin effect; the frequency sweep of the probe light point by point can be obtained The Brillouin Gain Spectrum (BGS) distribution along the sensing fiber, from which the distribution of the Brillouin Frequency Shift (BFS) along the sensing fiber can be obtained, using the proportional relationship between the frequency shift and temperature / strain and the optical t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01D5/353G01B11/16
Inventor 胡君辉阳丽潘福东梁维刚王力虎
Owner GUANGXI NORMAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap