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Distributed type optical fiber vibration and temperature double-physical-quantity sensing and positioning system

A distributed optical fiber, sensing and positioning technology, applied in the field of sensing and detection, can solve the problems of immature and unengineerable practical applications, and achieve the effect of reducing occupancy

Active Publication Date: 2017-05-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few and immature methods to realize the monitoring of the two at the same time, such as OFDR, which cannot realize the practical application of engineering

Method used

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  • Distributed type optical fiber vibration and temperature double-physical-quantity sensing and positioning system
  • Distributed type optical fiber vibration and temperature double-physical-quantity sensing and positioning system
  • Distributed type optical fiber vibration and temperature double-physical-quantity sensing and positioning system

Examples

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Embodiment

[0020] Example: The present invention is used for polarization control in a distributed optical fiber disturbance positioning system, such as figure 2 shown, the system includes the following components:

[0021] Light source: Two light sources are used, one is a pulsed laser with laser 1 as the center wavelength around 1550nm, and the other is a narrow-bandwidth distributed feedback laser (DFB) with laser 2 as the center wavelength around 1310nm, which is used to realize fiber vibration sensing.

[0022] Optical isolator 3: It is used to ensure the single pass of light, and isolate the light of 1310nm from entering the laser 1, so as to ensure that the laser is not damaged;

[0023] Optical circulators 4 and 5: used to transmit the light emitted by the light source to the object to be detected, collect the reflected signal light, and isolate the opposite light from entering the laser;

[0024] Fiber couplers 4, 7, 8, and 9: including three fiber couplers 4, 7, and 8 with a...

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PUM

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Abstract

The invention discloses a distributed type optical fiber vibration and temperature double-physical-quantity sensing and positioning system based on double Mach-Zehnder interference and Raman back scattering. The system comprises a light source, an optical circulator, a wavelength division multiplexer (WDM), a photoelectric detector, an optical fiber coupler, a sensing optical cable, a data acquisition card, an optical isolator and a computer, wherein the light source adopts two laser devices with different wavelengths and adopts a wavelength division multiplexing technology; temperature sensing is realized on one sensing arm in a Mach-Zehnder interferometer; meanwhile, the temperature sensing and an optical signal for vibration sensing do not influence each other; and finally, sensing and positioning of two physical quantities including vibration and temperature are realized in at least two sensing optical fibers. The method can be used for effectively reducing occupation on the sensing optical fibers in an optical fiber chain. Compared with a manner of detecting a vibration signal and a temperature signal by utilizing two technologies, the method has the effects of effectively saving optical fiber resources and realizing continuous real-time sensing.

Description

technical field [0001] The invention belongs to the technical field of sensing and detection, in particular to a distributed optical fiber vibration and temperature dual physical quantity sensing and positioning system based on interference and Raman scattering. Background technique [0002] With the continuous development of society, the safety inspection of important places and facilities such as oil depots, power plants, and oil pipelines is particularly important. Among them, distributed optical fiber sensing has many characteristics such as no charge, high voltage resistance, corrosion resistance, and electromagnetic interference resistance, and has increasingly become an important means and method in the field of security detection. Among them, the monitoring of the two physical quantities of vibration perception and temperature change is particularly important. For example, vibration detection can be used for intrusion detection, and temperature perception can be used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G01K11/32G01K11/324
CPCG01H9/004G01K11/32G01K11/324
Inventor 刘琨刘铁根潘亮江俊峰马春宇田苗
Owner TIANJIN UNIV
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