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Optical frequency domain reflection system for simultaneously measuring temperature and strain

A technology of optical frequency domain reflection and temperature measurement, which is applied to measurement devices, uses optical devices to transmit sensing components, and converts sensor output, etc. Improve measurement accuracy and improve the effect of signal-to-noise ratio

Active Publication Date: 2021-11-16
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] However, distributed fiber optic sensors are sensitive to both strain and temperature, often making temperature changes indistinguishable from strain changes, introducing errors when monitoring strain or temperature

Method used

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  • Optical frequency domain reflection system for simultaneously measuring temperature and strain
  • Optical frequency domain reflection system for simultaneously measuring temperature and strain

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Embodiment Construction

[0013] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described are only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative efforts shall fall within the protection scope of the present invention.

[0014] refer to figure 1 , the present invention provides an optical frequency domain reflection system for simultaneously measuring temperature and strain, comprising:

[0015] Tunable laser 1, first fiber coupler 2, second fiber coupler 3, third fiber coupler 4, fiber circulator 5, wavelength division multiplexer 6, optical fiber to be tested 7, fourth fiber coupler 9, Polarizing beam splitter...

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Abstract

The invention discloses an optical frequency domain reflection system for simultaneously measuring temperature and strain, and particularly belongs to the technical field of distributed optical fiber sensing. The system is characterized in that sweep-frequency light emitted by a tunable laser device enters a circulator, detection light enters a to-be-measured optical fiber from an outlet at one end of a circulator through a wavelength division multiplexer, Raman scattering light and backward Rayleigh scattering light are generated, and temperature and strain measurement is completed; and a Rayleigh scattering signal, a Stokes signal and an anti-Stokes signal are respectively demultiplexed by the wavelength division multiplexer and are respectively demodulated, a backward Rayleigh scattering spectrum offset is calculated by adopting a related algorithm to realize temperature and strain detection, and a Raman double-path analysis pulse response method is adopted to carry out temperature compensation, so that the problem of cross sensitivity between the temperature and the strain is solved, and simultaneous measurement of the temperature and the strain is realized.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensing, and more specifically relates to an optical frequency domain reflection system for simultaneously measuring temperature and strain. Background technique [0002] In recent years, fiber optic sensors have attracted extensive research interest worldwide. Fiber optic sensing technology is widely used in the safety monitoring of large structures such as pipelines and bridges in geological subsidence disaster areas due to its long measurement distance, anti-electromagnetic interference, and corrosion resistance. . Due to their distributed capability, they show higher advantages than conventional sensors. In terms of methods, optical time domain reflectometer (OTDR) and optical frequency domain reflectometer (OFDR) have found methods to meet various practical needs. OFDR uses continuous frequency-sweeping optical detection, which has the characteristics of high spatial resol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35361G01D5/35364
Inventor 刘香莲徐淑婉白清梁昌硕方正高妍张红娟王宇刘昕靳宝全
Owner TAIYUAN UNIV OF TECH
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