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Optical fiber wavelength demodulating light spectrum peak value positioning method

A wavelength demodulation and positioning method technology, which is applied in the optical fiber wavelength demodulation spectral peak positioning, and the optical fiber wavelength demodulation spectral peak positioning field based on the LM algorithm, can solve the problems of inaccurate wavelength demodulation and difficult application, and achieve easy realization. , the effect of improving accuracy and simplifying the data processing process

Active Publication Date: 2012-10-03
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the wavelength demodulation in the above-mentioned conventional method is not accurate enough and difficult to be applied in practice, and propose a method for locating the peak of the optical fiber wavelength demodulation spectrum based on the LM algorithm

Method used

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  • Optical fiber wavelength demodulating light spectrum peak value positioning method
  • Optical fiber wavelength demodulating light spectrum peak value positioning method
  • Optical fiber wavelength demodulating light spectrum peak value positioning method

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Embodiment

[0071] by figure 2 The multi-peak spectrum 202 with 81 pixel points is used as the spectrum to be demodulated in this embodiment, figure 2 Among them, the abscissa is the pixel index value N[i], i=0, 1...80, and the vertical axis is the light energy array P of the corresponding position of each pixel actually measured 0 [i], i=0, 1...80, the dotted line curve 201 is the actual spectral energy curve, the solid line curve 202 is the measured spectral energy curve, the peak point 203 is one of the actual spectral peaks, and the peak point 204 is the measured spectral energy curve one of the spectral peaks;

[0072] The implementation of the spectral peak location algorithm is: figure 2 The measured spectral curve 202 is fitted using the LM algorithm to obtain the actual spectral energy curve 201 , and then the spectral peak is precisely positioned to obtain the actual spectral peak 203 .

[0073] by figure 2 Taking the spectral energy curve 202 obtained in the measurement...

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Abstract

The invention relates to an optical fiber wavelength demodulating light spectrum peak value positioning method, belonging to the technical field of optical fiber sensing. The method comprises the following steps: firstly, carrying out maximum value detection on obtained diffraction light spectrum energy data; determining a suitable threshold value according to a maximum value and utilizing the threshold value to carry out peak searching treatment; constructing a fitting array by the processed data; and utilizing an LM peak value positioning algorithm to carry out accurate peak value positioning on the spectrum. Compared with the existing power weighted algorithm and Gaussian-polynomial fitting algorithm, the algorithm has the advantages of high-precision positioned light spectrum peak value; and the method is easy to realize on a digital television through a simplified data processing process.

Description

technical field [0001] The invention relates to a method for locating a peak value of an optical fiber wavelength demodulation spectrum, in particular to a method for locating a peak value of an optical fiber wavelength demodulation spectrum based on an LM algorithm, and belongs to the technical field of optical fiber sensing. Background technique [0002] As a sensitive element, fiber grating (FBG) has been widely used in the field of optical fiber sensing technology. The sensor using FBG as a sensitive element, its sensing principle is based on the relationship between the central wavelength of the FBG reflection spectrum and the strain or temperature change it is subjected to, so accurate reading of the central wavelength value of the FBG reflection spectrum is crucial to improving the performance of the FBG sensor important. [0003] Conventional optical fiber wavelength demodulation spectrum peak location methods mostly use power weighting algorithm, Gaussian-polynomia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/26
Inventor 申雅峰胡春艳何彦璋
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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