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Distributed type optical fiber sensing device and method for simultaneously measuring temperature, strain and vibration

A distributed optical fiber and sensing device technology, which is applied in the transmission of sensing components, measuring devices, instruments, etc. using optical devices, can solve problems such as inability to measure strain, and achieve the goal of avoiding strain demodulation distortion, reducing costs, and avoiding differences. Effect

Active Publication Date: 2014-04-16
ZHEJIANG ZHONGXIN POWER MEASUREMENT & CONTROL TECH
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AI Technical Summary

Problems solved by technology

Combining Rayleigh scattering technology and Raman scattering technology (CN102589620A) can perform vibration and temperature sensing, but cannot measure strain

Method used

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  • Distributed type optical fiber sensing device and method for simultaneously measuring temperature, strain and vibration
  • Distributed type optical fiber sensing device and method for simultaneously measuring temperature, strain and vibration
  • Distributed type optical fiber sensing device and method for simultaneously measuring temperature, strain and vibration

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Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] As shown in the figure, a distributed optical fiber sensing device includes: a frequency stabilized laser 1, a single sideband modulator 2, an optical pulse generator 3, an optical amplification unit 4, a polarization scrambling unit 5, an optical circulator or an optical coupling device 6, sensing optical fiber 7, spectroscopic unit 8, first photodetector 91, second photodetector 92, third photodetector 93, high-speed data acquisition unit 9 and system control and data processing unit 10, system control and The data processing unit 10 is electrically connected to the frequency-stabilized laser 1 and the optical pulse generator 3 respectively, the system control and data processing unit 10 is electrically connected to the SSB modulator 2 through the microwave generator 21, and the frequency-stabilized laser 1 emits a laser with a stable ...

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Abstract

The invention discloses a distributed type optical fiber sensing device which comprises a frequency stabilized laser, a single side band modulator, an optical pulse generator, an optical amplification unit, a scrambling unit, an optical circulator or optical coupler, a sensing optical fiber, a light splitting unit, a first optical detector, a second optical detector, a third optical detector, a high-speed data collecting unit and a system control and data processing unit. The system control and data processing unit is respectively and electrically connected with the frequency stabilized laser and the optical pulse generator, and the system control and data processing unit is electrically connected with the single side band modulator through a microwave generator. The distributed type optical fiber sensing device has the advantages that a high-stability laser light source is adopted to be combined with microwave frequency modulation, and temperature, strain and vibration can be simultaneously measured through the unique control and data processing process.

Description

technical field [0001] The invention relates to an optical fiber sensing device, in particular to a distributed optical fiber sensing device and a method for simultaneously measuring temperature, strain and vibration. Background technique [0002] Petroleum, chemical industry, metallurgy, electric power and other industries are the foundation of national economic development and are closely related to social and economic life. Once accidents such as fire, leakage, and power failure occur in these industrial sites, it will bring huge property losses and even threaten people's lives. The safety monitoring of these basic industrial facilities is an important guarantee for the orderly and efficient operation of society and economy. This requires obtaining as much operating information as possible of basic industrial facilities, such as temperature, strain, vibration, etc. [0003] Optical fiber sensing technology is one of the effective sensing methods applied to infrastructur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01D21/02
Inventor 刘航杰涂勤昌魏乃科孙梦翔
Owner ZHEJIANG ZHONGXIN POWER MEASUREMENT & CONTROL TECH
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