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Method for filtering pulse jamming in optical fiber demodulation system based on adaptive threshold

An adaptive threshold and demodulation system technology, which is applied in the direction of transmitting sensing components, converting sensor output, and measuring devices by using optical devices, can solve problems affecting waveform sensitivity and influence, and achieve accurate filtering of pulse interference. Simple, high-resolution effects

Active Publication Date: 2018-02-02
BEIHANG UNIV
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Problems solved by technology

However, it cannot effectively filter out the interference of the pulse signal in the digital signal, and it will affect the sensitivity of the waveform.
On the other hand, in digital filtering, the anti-pulse interference average filtering method is often used for pulse interference, but this method will have a certain impact on the fiber grating reflection spectrum signal when it is used for filtering of fiber grating demodulation digital signals

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  • Method for filtering pulse jamming in optical fiber demodulation system based on adaptive threshold
  • Method for filtering pulse jamming in optical fiber demodulation system based on adaptive threshold
  • Method for filtering pulse jamming in optical fiber demodulation system based on adaptive threshold

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[0030] The present invention is a method for filtering out pulse interference in a fiber demodulation system based on an adaptive threshold, see figure 1 As shown, the specific steps are as follows:

[0031] Step 1: Build a fiber grating sensor demodulation system based on the fiber Fabry-Perot tunable filter demodulation method, and perform the analog-to-digital conversion (Analog to digital conversion or ADC) of the central wavelength reflection spectrum signal after photoelectric conversion

[0032] Choose the optical fiber sensor model EDF-MP980, use the optical fiber Fabry-Perot tunable filter demodulation method, pass the light of the broadband light source through the FP cavity, after passing through the optical coupler, divide into two light, the first light Enter the fiber grating sensor, and the other light enters the optical comb filter. The reflected signal of the first light passes through the output of the optical coupler. By measuring the transmitted light of the op...

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Abstract

The invention provides a method for filtering pulse jamming in an optical fiber demodulation system based on adaptive threshold. The method comprises the following steps: 1) constructing a fiber grating sensor demodulation system based on an optical fiber Fabry-Perot tunable filter demodulation method, and carrying out analog-to-digital conversion on central wavelength reflection spectrum signalsobtained after photovoltaic conversion; 2) carrying out first-order lag filtering and smoothing on the collected digital signals to enable signal waveform to be more smooth; 3) carrying out amplitude-limited filtering based on adaptive threshold to filter the pulse jamming, thereby improving demodulation precision; and 4) demodulating a fiber grating sensor through the result obtained after filtering, and comparing and verifying the filtering effects. Through the steps above, the method for filtering pulse jamming in the optical fiber demodulation system based on adaptive threshold can filterthe pulse jamming in the optical fiber demodulation system efficiently and accurately, solves the problem of low precision of the optical fiber demodulation system in the actual use process and is suitable for application in practical engineering.

Description

Technical field [0001] The present invention provides a method named "a method for filtering impulse interference in a fiber demodulation system based on an adaptive threshold", that is, "a method for filtering pulse interference in a fiber demodulation system based on an adaptive threshold". The double threshold of data change can efficiently and accurately filter out the pulse interference in the optical fiber demodulation system. Its purpose is to improve the accuracy of the optical fiber demodulation system to meet the needs of structural health monitoring in practical applications. In addition, the method of the present invention is beneficial to the popularization and application of the optical fiber sensor in the field of actual engineering, and belongs to the technical field of structural health monitoring. Background technique [0002] The optical fiber sensor can monitor the stress and strain in the local area of ​​the patch in real time, and has the advantages of anti-...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35312
Inventor 张卫方李英武任飞飞谢宇宽蓝煜东黄元星靳晓帅张萌
Owner BEIHANG UNIV
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