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Pre-pumped pulse and Gray code based BOTDA (Brillouin Optical Time Domain Analysis) instrument

An optical time domain analyzer, a technology in the Brillouin time domain, which is used in instruments, scientific instruments, thermometers with physical/chemical changes, etc., can solve the problem of system measurement accuracy decline, Brillouin gain weakening, and system signal-to-noise ratio. Deterioration and other problems, to achieve the effect of improving frequency measurement accuracy, improving spatial resolution, and increasing sensing distance

Active Publication Date: 2016-06-15
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0005] The present invention aims at the problems of Brillouin gain weakening caused by narrow pump pulses in the existing BOTDA system, deterioration of system signal-to-noise ratio, limitation of sensing distance, and decrease of system measurement accuracy caused by broadening of Brillouin gain spectrum. A Brillouin Optical Time Domain Analyzer (BOTDA) Based on Pre-pump Pulse and Gray (Golay) Code Coding

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  • Pre-pumped pulse and Gray code based BOTDA (Brillouin Optical Time Domain Analysis) instrument
  • Pre-pumped pulse and Gray code based BOTDA (Brillouin Optical Time Domain Analysis) instrument
  • Pre-pumped pulse and Gray code based BOTDA (Brillouin Optical Time Domain Analysis) instrument

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Embodiment Construction

[0025] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] see figure 1 , the BOTDA system of the present invention consists of a narrow linewidth semiconductor laser 1, a coupler 2, a first erbium-doped fiber amplifier 3, a first polarization controller 4, a single sideband modulator 5, a microwave source 6, an optical isolator 7, Sensing fiber 8, optical circulator 9, second erbium-doped fiber amplifier 10, polarization scrambler 11, electro-optical intensity modulator 12, second polarization controller 13, arbitrary waveform generator 14, optical filter 15, photodetector 16. The signal acquisition and processing system 17 is composed.

[0027] Compared with the traditional Golay code, the Golay code used in the present invention introduces a pre-pumped part, and the result of the sum of its autocorrelation function is no longer an integer multiple of the unit impulse function. The Brillo...

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Abstract

The invention relates to the technical field of fiber sensing, and especially to a pre-pumped pulse and Gray code based BOTDA instrument. The BOTDA instrument comprises a narrow-linewidth semiconductor sensor, a coupler, a first erbium doped fiber amplifier, a first polarization controller, a single sideband modulator, a microwave source, an optical isolator, a sensing fiber, an optical annular device, a second erbium doped fiber amplifier, a polarization scrambler, an electro-optical intensity modulator, a second polarization controller, an arbitrary waveform generator, an optical filter, a photoelectric detector and a signal collecting and processing system. On the premise that the high spatial resolution of a BOTDA system is maintained, the BOTDA instrument ensures the sensing distance and the measuring precision of the system, and improves the sensing performance of the system.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a Brillouin Optical Time Domain Analyzer (BOTDA) based on pre-pump pulses and Gray (Golay) code encoding. Background technique [0002] The distributed optical fiber sensing system is a sensing system used to continuously measure physical quantities such as temperature and strain at any position along the optical fiber. The optical fiber in the system is not only the transmission medium of light but also the sensing carrier, which can realize long-distance and large-scale Sensing is an important branch of optical fiber sensing. Among many distributed optical fiber sensing systems, the Brillouin Optical Time Domain Analyzer (BOTDA) based on stimulated Brillouin scattering has the advantages of long sensing distance, high measurement accuracy and high spatial resolution. It has broad application prospects in the structural monitoring of communication optical cables, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01K11/32G01L1/24G01K11/322
CPCG01D5/353G01K11/32G01L1/242G01K11/322
Inventor 孟洲孙乔涂晓波王建飞陈羽孙世林陈默陈伟胡晓阳
Owner NAT UNIV OF DEFENSE TECH
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