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A Method for Improving the Sensitivity of Strain Measurement Using Thin-clad Optical Fiber in Optical Frequency Domain Reflectometry

An optical frequency domain reflection and strain measurement technology, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problem of low sensitivity of strain sensing, and achieve small strain values, optical fiber Rayleigh scattering spectral shifts and strains Ratio is the effect of strain sensing sensitivity improvement

Active Publication Date: 2018-07-10
TIANJIN UNIV
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Problems solved by technology

[0003] The invention provides a method for improving the sensitivity of strain measurement by using a thin-clad diameter optical fiber in optical frequency domain reflection. The cladding optical fiber, that is, the thin-diameter optical fiber, is used as the sensing optical fiber to achieve a smaller strain value under the same spatial resolution. See the description below for details:

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  • A Method for Improving the Sensitivity of Strain Measurement Using Thin-clad Optical Fiber in Optical Frequency Domain Reflectometry
  • A Method for Improving the Sensitivity of Strain Measurement Using Thin-clad Optical Fiber in Optical Frequency Domain Reflectometry
  • A Method for Improving the Sensitivity of Strain Measurement Using Thin-clad Optical Fiber in Optical Frequency Domain Reflectometry

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[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

[0034] A method for improving the sensitivity of strain measurement by using thin-clad optical fiber in optical frequency domain reflection, see figure 1 with figure 2 , the strain measurement sensitivity method specifically includes the following steps:

[0035] (1) In the main interferometer 25, the optical fiber of the smaller diameter cladding, i.e. the thin-diameter optical fiber 15, is scattered back to Rayleigh to form a beat frequency interference signal (the two-way signal sum of the polarization beam splitter), and this beat frequency interference The signals (optical frequency domain information) are respectively subjected to fast Fourier transform, and the optical frequency domain information is converted to the distance domain information corresponding to each pos...

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Abstract

The invention discloses a method of employing thin cladding fibers to improve strain measurement sensitivity in optical frequency domain refection, which performs distributed strain measurement based on single-mode fiber rayleigh diffusion light spectrum movement in optical frequency domain refection; when minor diameter cladding fibers, i.e., small diameter fibers are used as sensing fibers, the ratio between a fiber rayleigh diffusion light spectrum movement amount and a strain capability, i.e., strain sensing sensitivity is substantially improved. The method can measure a smaller strain capability under a same spatial resolution.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensing instruments, in particular to a method for improving strain measurement sensitivity by using optical fibers with different cladding diameters in optical frequency domain reflection. Background technique [0002] Distributed strain sensing with high precision and high spatial resolution is widely used in many fields such as people's livelihood, national defense and security, such as structural health monitoring of key parts such as aircraft, spacecraft, ships, national defense equipment, industrial equipment, bridges and culverts, etc. Spectral shifting of single-mode fiber Rayleigh scattering in optical frequency domain reflectance enables distributed strain sensing with high precision and high spatial resolution. This method adopts common single-mode communication optical fiber as sensing optical fiber, and its cladding diameter is 125 microns, and the coating layer diam...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
CPCG01B11/161
Inventor 刘琨丁振扬刘铁根江俊峰杨迪杜阳徐哲茜
Owner TIANJIN UNIV
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