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

A realization method, a technology of detecting light, applied in measuring devices, measuring heat, adopting optical devices, etc., can solve problems such as inability to reconstruct the Brillouin scattering spectrum, achieve the goal of increasing speed, improving spatial resolution, and simplifying spectrum scanning equipment Effect

Active Publication Date: 2014-11-19
南京瑞蓝世光电传感技术研究院有限公司
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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 used, only one spectral component of the Brillouin scattering spectrum can be measured at a time, and cannot be reconstructed Complete Brillouin Scattering Spectrum

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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 implementation method based on comb spectrum continuous detection light, this system generates stimulated Brillouin scattering by using comb spectrum continuous detection light and narrow linewidth single-frequency pump pulse light, and comb spectrum continuous detection The light is amplified according to the stimulated Brillouin gain spectrum line, and the comb spectrum interval adopted is larger than the required frequency measurement accuracy, and then the difference in the comb spectrum after the stimulated Brillouin scattering is measured. The power of each frequency is used to obtain the power at each frequency, and finally the complete Brillouin scattering spectrum is obtained by combining the spectral line fitting algorithm, the peak value and area of ​​the spectrum are obtained, and the Brillouin frequency shift and Brillouin scattering signal power are obtained. The temperature and strain at the spatial position can be obtained by using the deep...

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Abstract

The invention relates to a BOTDA system 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 method for realizing a BOTDA system based on comb spectrum continuous detection of light. 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,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353G01K11/32G01B11/16G01K11/322
Inventor 万生鹏何兴道
Owner 南京瑞蓝世光电传感技术研究院有限公司
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