Peak positioning method of overlapping fiber bragg grating (FBG) sensing signals

A technology for sensing signals and positioning methods, which is applied in the direction of converting sensor output, using optical devices to transmit sensing components, measuring devices, etc. and other problems, to achieve the effect of good adaptability and high accuracy

Inactive Publication Date: 2018-06-29
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0003] Commonly used peak location algorithms include direct comparison method, polynomial fitting method, and Gaussian curve fitting method. The direct comparison method is sensitive to background information, has low computational complexity, and poor anti-noise performance. It is only suitable for finding isolated peaks and is not suitable for complex signals. Peak-seeking; polynomial fitting method require...

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  • Peak positioning method of overlapping fiber bragg grating (FBG) sensing signals
  • Peak positioning method of overlapping fiber bragg grating (FBG) sensing signals
  • Peak positioning method of overlapping fiber bragg grating (FBG) sensing signals

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Embodiment

[0028] like figure 1 Shown, a kind of overlapping FBG sensing signal peak localization method comprises the following steps:

[0029] Step 1: Process the FBG reflection signal by continuous wavelet transform.

[0030] The continuous wavelet transform is used to process the original FBG reflection signal, which is beneficial to analyze the instantaneous time-varying part of the signal, and can adaptively extract feature information from the signal.

[0031] Step 2: Improve the wavelet ridge peak-finding algorithm by matrix singular value decomposition.

[0032] The matrix singular value decomposition method can extract the effective information corresponding to the peak part of the signal in the wavelet coefficient, and can effectively eliminate the pseudo local maximum point, and achieve the elimination of low-frequency noise in the signal, and the original wavelet ridge based on the maximum value The line peak-finding algorithm is improved.

[0033] Step 3: Combining with ...

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Abstract

The invention relates to a peak positioning method of overlapping FBG sensing signals, and belongs to the field of optical fiber sensing signal processing research of photoelectric detection. The method comprises the following steps: using continuous wavelet transform to process FBG reflected signals to eliminate the influence of signal noises on peak positioning accuracy; using a wavelet ridge peak finding algorithm to obtain peak initial positioning points of peak overlapping FBG signals with the continuity of extreme values at different scales; improving the wavelet ridge peak finding algorithm through matrix singular value decomposition, extracting wavelet ridges which can represent local characteristic information of the FBG reflected signals, and removing a pseudo maximum value affecting peak positioning; and combining peak energy with a signal-to-noise ratio to obtain accurate peak points of final overlapping peaks. By adopting the method, the peak overlapping problem of the FBGreflected signals can be effectively solved.

Description

technical field [0001] The invention relates to a method for processing optical fiber sensing signals, in particular to a method for locating the peak value of overlapping FBG sensing signals. Background technique [0002] Fiber Bragg Grating (FBG) sensors are widely used in electric power, construction, chemical and other fields due to their superior reliability in harsh environments, high precision and sensitivity, and immunity to electromagnetic interference. The demodulation principle is to realize the measurement of the environmental parameters to be measured by detecting the Bragg center wavelength shift caused by the change of the external environment. In practical engineering applications, the detection accuracy of the FBG sensor is mainly determined by the demodulation capability of the sensing system in addition to the characteristics of the sensor itself. For the FBG sensor demodulation system, its resolving power is the criterion for judging the quality of the s...

Claims

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Application Information

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IPC IPC(8): G01D5/353
CPCG01D5/35316
Inventor 李志斌黄启韬刘畅
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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