BOTDA (Brillouin Optical Time-domain Analyzer) system based on comb frequency spectrum continuous probe beam

A technology for detecting light and spectrum, which is applied in the field of BOTDA system, can solve problems such as the inability to reconstruct the Brillouin scattering spectrum, achieve the effect of increasing speed, improving spatial resolution, and simplifying spectrum scanning equipment

Active Publication Date: 2012-08-22
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

For conventional single-mode fiber, the 3dB bandwidth of the Brillouin scattering spectrum is also about 35MHz, so that even if the pump light of the comb spectrum is

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  • BOTDA (Brillouin Optical Time-domain Analyzer) system based on comb frequency spectrum continuous probe beam
  • BOTDA (Brillouin Optical Time-domain Analyzer) system based on comb frequency spectrum continuous probe beam
  • BOTDA (Brillouin Optical Time-domain Analyzer) system based on comb frequency spectrum continuous probe beam

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[0024] A BOTDA system based on comb-shaped spectrum continuous detection light. This system uses comb-shaped spectrum continuous detection light and narrow linewidth single-frequency pump pulse light to generate stimulated Brillouin scattering. The stimulated Brillouin gain spectrum is amplified, and the comb-shaped spectrum with a larger interval than the required frequency measurement accuracy is used, and then the comb-shaped spectrum of different frequencies after the stimulated Brillouin scattering is measured. Power to obtain the power at each frequency, and finally combine the spectral line fitting algorithm to obtain the complete Brillouin scattering spectrum, obtain the peak value and area of ​​the spectrum, and obtain the Brillouin frequency shift and the power of the Brillouin scattering signal. Shift and Brillouin scattering signal power to obtain the temperature and strain at the spatial position, and change the measurement time to obtain the temperature and strain ...

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Abstract

The invention relates to a BOTDA system implement method based on a comb frequency spectrum continuous probe beam, which is characterized in that in the system, stimulated Brillouin scattering is generated by the comb frequency spectrum continuous probe beam as well as single frequency pumping pulse light with a wide narrow line; the comb frequency spectrum continuous probe beam is amplified by a stimulated Brillouin gain spectral line; an interval of an adopted comb frequency spectrum is larger than that of a required comb frequency spectrum with large frequency measurement precision; powers at the respective frequency positions are obtained through measurement via the powers of different frequencies in the comb frequency spectrum subjected to the stimulated Brillouin scattering; and finally, a complete Brillouin scattering spectrum is obtained in combination with a spectral line fitting algorithm to obtain temperature and strain at the space position. The BOTDA system has the beneficial effects that the dynamic property of the BOTDA system is improved, the spatial resolution is improved, the frequency spectrum scanning equipment of the system is simplified, the spectral line fitting speed is improved, the detect of restriction between a comb frequency spectrum interval and a pulse width is overcome, and the speed problem of a continuous frequency sweeping system is also solved.

Description

technical field [0001] The invention relates to a BOTDA system for continuously detecting light based on comb spectrum. Background technique [0002] The present invention is proposed aiming at the problems existing in BOTDA in structural health monitoring. [0003] In distributed Brillouin optical fiber sensing, there are two types: BOTDR (Brillouin Optical Time Domain Reflectometer) and BOTDA (Brillouin Optical Time Domain Analysis Technology). For distributed temperature and strain sensing systems using conventional single-mode fiber as the sensing medium, both BOTDR and BOTDA need to analyze the Brillouin scattering spectrum, that is, measure the Brillouin frequency shift (the central frequency of the pump light pulse and the Brillouin Scattering signal center frequency difference) and Brillouin scattering signal power changes to obtain temperature and strain information. Compared with BOTDR, BOTDA has higher sensitivity and dynamic range. However, for BOTDR, the back...

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Application Information

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IPC IPC(8): G01D5/353G01K11/32G01B11/16G01K11/322
Inventor 万生鹏何兴道
Owner NANCHANG HANGKONG UNIVERSITY
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