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Method for realizing all-fiber distributed multi-parameter sensing

A distributed, multi-parameter technology, applied in measuring devices, measuring heat, and thermometers with physical/chemical changes, can solve the problem that sensors cannot simultaneously realize vibration sensing, etc., and achieve the effect of simple structure and low cost

Inactive Publication Date: 2015-11-04
SUZHOU ZEN FIBER SENSING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this sensor cannot realize vibration sensing at the same time

Method used

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  • Method for realizing all-fiber distributed multi-parameter sensing
  • Method for realizing all-fiber distributed multi-parameter sensing
  • Method for realizing all-fiber distributed multi-parameter sensing

Examples

Experimental program
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Embodiment Construction

[0032] Such as figure 1 As shown, the device for realizing quasi-distributed vibration sensing includes a pulsed light source with an output of 1.5 micron waveband linearly polarized light 1, an optical circulator 2, a piece of ordinary single-mode fiber with a length of L (16km) 3, and a 4-port Wavelength division multiplexer 4, the first APD probe 5, the second APD probe 6, an optical coupler 7, the first PD probe 8, a polarization beam splitter 9, the second PD probe 10, one Computer 11 with data collection and processing functions.

[0033] The specific method for realizing quasi-distributed vibration sensing includes the following steps:

[0034] (1) Choose a pulsed light source that outputs linearly polarized light in the 1.5-micron waveband 1, an optical circulator 2, a piece of ordinary single-mode fiber with a length of L (16km), a 4-port wavelength division multiplexer 4, the first One APD probe 5, a second APD probe 6, an optical coupler 7, a first PD probe 8, a polari...

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Abstract

The invention discloses a method for realizing all-fiber distributed multi-parameter sensing. The method is mainly suitable for long-distance distributed temperature and vibration sensing. By utilizing sensitivity of Raman anti-Stokes light to the temperature and sensitivity of Rayleigh scattering light polarization state to vibration, light power of Raman Stokes light, the Raman anti-Stokes light and the Rayleigh scattering light as well as time difference of two signals arriving at probes are measured through two APP probes and two PD probes respectively so as to determine temperature and vibration signal magnitude and corresponding sensing places, and thus distributed temperature and vibration multi-parameter sensing is realized. The method does not need expensive narrow linewidth laser and has the advantages of simple structure and low cost and the like.

Description

Technical field [0001] The invention belongs to the technical field of optical fiber sensing, and particularly relates to a sensing method based on optical fiber Raman effect and polarization sensitivity to realize simultaneous distributed measurement of temperature and vibration. Background technique [0002] All-fiber sensing technology is a new generation technology in the field of sensing and has become an indispensable part of the development of the Internet of Things technology. Optical fiber can be used not only as a transmission medium for light waves, but also as a medium for light waves to perceive the external environment. When the light wave is transmitted in the optical fiber, its characteristic parameters such as amplitude, phase, polarization state, wavelength, etc. will directly or indirectly change due to external factors such as temperature, vibration, strain, magnetic field, electric field, displacement, etc., so the optical fiber can be used as The sensing el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01H9/00G01K11/324
Inventor 陈达如张徐亮
Owner SUZHOU ZEN FIBER SENSING TECH CO LTD