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Method for improving spectral resolution in optical frequency domain reflected optical fiber distributed sensing

A technology of optical frequency domain reflection and optical fiber distribution, which is applied in the direction of using optical devices to transmit sensing components, converting sensor output, and using optical devices, etc., which can solve the problem of the decrease in calculation accuracy of spectral translation, and the inability to meet high positioning accuracy at the same time Distributed sensing applications and other issues to achieve the effect of improving sensing positioning accuracy, high sensing resolution, and high positioning accuracy

Inactive Publication Date: 2017-11-17
XIAN FLIGHT SELF CONTROL INST OF AVIC
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Problems solved by technology

Although this method is relatively simple in implementation, when calculating the spectral translation, the spectral resolution is limited by the size of the sensing unit, so that while obtaining a higher positioning accuracy, the reduction of the spectral resolution leads to a decrease in the calculation accuracy of the spectral translation. Meet distributed sensing applications with high positioning accuracy and high sensing resolution

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  • Method for improving spectral resolution in optical frequency domain reflected optical fiber distributed sensing
  • Method for improving spectral resolution in optical frequency domain reflected optical fiber distributed sensing
  • Method for improving spectral resolution in optical frequency domain reflected optical fiber distributed sensing

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[0025] A method for improving spectral resolution in optical frequency domain reflection optical fiber distributed sensing, the method is applied to optical frequency domain reflection distributed sensors, and the method includes the following steps:

[0026] 1) The frequency-sweeping laser scans twice within a certain wavelength range. The first scan of the frequency-sweeping laser is carried out under the conditions of no strain or no temperature change in the sensing fiber, that is, the reference condition. The frequency domain responses are respectively subjected to fast Fourier transform and vector addition to obtain the time domain distribution of the sensing fiber, and the time domain distribution signal is used as a reference signal; Under the condition of temperature change, that is, under the condition of sensing, the time domain distribution signal of the sensing fiber is obtained by fast Fourier transform and vector addition of the obtained two optical frequency dom...

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Abstract

The invention discloses a method for improving spectral resolution in optical frequency domain reflected optical fiber distributed sensing and belongs to the field of optical fiber distributed sensing technology. The invention aims at limitation factors of a spectral cross-correlation method in reducing the spectral resolution when achieving the high positioning accuracy in the prior art and proposes a frequency domain interpolation method to improve the spectral resolution of the spectral cross-correlation method. The method can ensure that the spectral resolution will not decline while obtaining high positioning accuracy, so as to meet the high positioning accuracy and high sensing resolution distributed sensing applications, such as the high-precision distributed sensing of an aircraft and other small and medium-sized structures.

Description

technical field [0001] The invention discloses a method for improving spectral resolution in optical frequency domain reflective optical fiber distributed sensing, which belongs to the technical field of optical fiber distributed sensing. Background technique [0002] With the help of the excellent physical properties of optical fibers, optical fiber distributed sensing technology has the advantages of small size, light weight, easy arrangement, and anti-electromagnetic interference. It is widely used in structural health monitoring fields such as buildings, bridges, oil wells, ships, and aircraft. Optical frequency domain reflection distributed sensing calculates the distribution of temperature and strain by measuring the translation of Rayleigh scattering spectrum at various places in the sensing fiber, which is a continuous distributed sensing technology. Compared with other optical fiber distributed sensing technologies, this technology has the characteristics of low cos...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01B11/16G01K11/32
CPCG01B11/18G01D5/35361G01K11/32
Inventor 张超包艳郑普超张兵杨楠
Owner XIAN FLIGHT SELF CONTROL INST OF AVIC
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