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Optical frequency domain reflection-distributed vibration frequency sensing and locating device and demodulation method

A technology of optical frequency domain reflection and vibration frequency, which can be used in measurement devices, using wave/particle radiation, instruments, etc., to solve problems such as test length limitations

Active Publication Date: 2012-12-26
TIANJIN UNIV
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Problems solved by technology

It can be seen that the test length of this method is still very limited

Method used

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  • Optical frequency domain reflection-distributed vibration frequency sensing and locating device and demodulation method
  • Optical frequency domain reflection-distributed vibration frequency sensing and locating device and demodulation method
  • Optical frequency domain reflection-distributed vibration frequency sensing and locating device and demodulation method

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Embodiment Construction

[0038] The present invention will be further described in detail below in combination with specific embodiments.

[0039] Such as figure 1 As shown, an optical frequency domain reflection distributed vibration frequency sensing and positioning device provided by the present invention includes: a tunable laser 1, a 1:99 optical beam splitter 4, a tuning signal control module 22, and an auxiliary interferometer-based Clock trigger system 21 , master interferometer 20 and computer 11 .

[0040] Tunable laser 1: used to provide light source for the optical frequency domain reflection system, the light source adopts ultra-narrow line width linearly tuned whispering gallery mode self-injection mode-locked laser light source, its optical frequency can be linearly scanned, the light source is controlled by the tuning signal control module 22 , the tuning signal control module 22 generates a triangle wave or a sawtooth wave to drive the tunable laser 1 according to requirements.

[0...

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Abstract

The invention discloses an optical frequency domain reflection-distributed vibration frequency sensing and locating device and a demodulation method. A technical method of optical frequency domain reflection beat frequency interference of a self-injective mode locking laser of a linear turning ultra-narrow linewidth whispering gallery mode is adopted in the optical frequency domain reflection-distributed vibration frequency sensing and locating device. The optical frequency domain reflection-distributed vibration frequency sensing and locating device comprises a main interferometer which is used to obtain a sensing signal and an auxiliary interferometer of a clock trigger signal. The demodulation method comprises that wavelength domain information is obtained by the main interferometer, fast Fourier transform is used to transform the wavelength domain information, and then distance domain information is obtained. A group of static reference signals and a group of vibration signals are collected. The distance domain information, namely local distance domain information, is selected in sequence by moving windows. Complex number cross correlation is used on the static signals and the vibration signals of the local distance domain information on each position. According to a noise coefficient of the complex number cross correlation, a position of a vibration point is obtained. A subsidiary summit position of the complex number cross correlation of the local distance domain information on the position of the vibration is picked up, and the subsidiary summit position is vibration frequency information.

Description

technical field [0001] The invention belongs to the technical field of distributed optical fiber sensing instruments, and in particular relates to a distributed vibration frequency sensing and positioning device and a demodulation method based on an optical frequency domain reflection method. Background technique [0002] With the continuous development of society, the health and safety monitoring of large building structures such as bridges, culverts, tunnels, and dams is particularly important. Among them, the structural vibration frequency information is an important parameter for structural health and safety monitoring, because the eigenfrequency is an important indicator for evaluating the structural health and judging the early damage of the building. [0003] The distributed optical fiber vibration sensing system can realize vibration frequency detection and positioning of vibration points, and has the characteristics of long-distance monitoring, high-precision positi...

Claims

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Application Information

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IPC IPC(8): G01H9/00
Inventor 刘铁根刘琨丁振扬江俊峰杜阳李定杰
Owner TIANJIN UNIV
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