Optical fiber sensing dynamic signal demodulation method based on spectral fitting and difference algorithm

A dynamic signal, optical fiber sensing technology, which is applied in the direction of using optical devices to transmit sensing components, convert sensor outputs, and reduce undesired effects. It can solve problems such as inaccurate demodulation signals, simplify complexity, eliminate The influence of environmental factors, the effect of eliminating the interference of environmental factors

Active Publication Date: 2017-05-31
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the above defects and improvement needs of the prior art, the present invention provides a dynamic signal demodulation method of optical fiber sensing based on spectrum fitting and

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  • Optical fiber sensing dynamic signal demodulation method based on spectral fitting and difference algorithm
  • Optical fiber sensing dynamic signal demodulation method based on spectral fitting and difference algorithm
  • Optical fiber sensing dynamic signal demodulation method based on spectral fitting and difference algorithm

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[0034] In order to make the object, technical solution and advantages of the present invention clearer, 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 here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0035] figure 1 The flow chart of the optical fiber sensing dynamic signal demodulation method based on spectrum fitting and differential algorithm provided by the present invention, the steps include:

[0036] (1) Scan the optical signal output by the fiber optic sensor from the start wavelength to the stop wavelength to obtain the spectral ripple. The start wavelength and stop wavelength, sc...

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Abstract

The invention discloses an optical fiber sensing dynamic signal demodulation method based on spectral fitting and a difference algorithm. The method comprises the following steps: performing scanning to obtain spectral ripples; fitting the spectral ripples to obtain a static spectrum; performing difference processing on the spectral ripples and the static spectrum to obtain difference signals; fitting extreme points of the spectral ripples to obtain upper and lower edge envelope curves; performing difference processing on the upper and lower edge envelope curves to obtain a spectral change function, performing normalization processing on the difference signals and the spectral change function to obtain envelope-removed difference signals, converting wavelength into time according to scanning speed and initial wavelength to obtain envelope-removed time-domain dynamic signals. According to the method, the dynamic signals are obtained by performing difference processing on the spectral ripples and a fitting curve of the spectral ripples, environmental interference such as temperature, humidity and the like can be eliminated, and the recovered dynamic signals hardly have dc component; meanwhile, broadband light is taken as input of an optical fiber sensor, and the complexity of an optical fiber sensing device is reduced.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a method for demodulating dynamic signals of optical fiber sensing based on spectrum fitting and differential algorithms. Background technique [0002] In recent years, due to the continuous occurrence of natural disasters and safety accidents such as earthquakes, mine accidents, and oil pipeline leakage, acoustic wave and vibration signal sensing has attracted more and more attention. Compared with traditional electrical or mechanical sensors, dynamic signal sensors based on optical fiber technology have the advantages of small size, light weight, anti-electromagnetic interference, corrosion resistance, and easy networking and multiplexing. In order to realize the accurate measurement of the dynamic signal, the demodulation method of the optical fiber sensing dynamic signal has also been extensively studied by scholars at home and abroad. Accurate meas...

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Application Information

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IPC IPC(8): G01D5/26G01D3/028G01H9/00
CPCG01D3/028G01D5/268G01H9/004
Inventor 鲁平傅鑫刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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