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Hybrid demodulation method of pgc and inversion stripping for suppressing signal crosstalk

A demodulation method and signal crosstalk technology, which is applied in the field of mixed demodulation of phase modulated carrier and reverse stripping layer, can solve the problems that the crosstalk interference item cannot be completely stripped, the system noise increases, etc., to suppress signal crosstalk and reduce the background noise effect

Active Publication Date: 2017-03-15
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

At present, the reverse peeling method at home and abroad cannot be directly used in the time division multiplexing array demodulated by PGC, especially after the differential cross multiplication (DCM) algorithm in PGC, the existing reverse peeling method The crosstalk interference term cannot be completely stripped, but it will cause the system noise to increase

Method used

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  • Hybrid demodulation method of pgc and inversion stripping for suppressing signal crosstalk
  • Hybrid demodulation method of pgc and inversion stripping for suppressing signal crosstalk
  • Hybrid demodulation method of pgc and inversion stripping for suppressing signal crosstalk

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with accompanying drawing.

[0035]The principle of concrete realization of the present invention can be expressed as follows: for figure 1 For the time division multiplexing FP cavity sensing system shown, for the sake of simplicity, a double time division multiplexing FP cavity array composed of three FBGs is taken as an example (N=3), and the amplitude reflectances of the three FBGs are ρ 0 , ρ 1 , ρ 2 , the amplitudes of the two incident light pulses are written as E(0) and E(1), and the specific implementation steps are as follows:

[0036] S1. Sampling the first three returned pulses, the obtained sampling results are:

[0037]

[0038]

[0039] () ﹡ Indicates conjugate calculation;

[0040] It can be seen that I 0 reflects the reflectivity of the first grating; I 1 The underlined part indicates the exchange item, which only contains That is, the round-trip phase difference of the ...

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Abstract

The invention relates to the technical field of optical fiber sensing and discloses a PGC (phase generated carrier) and inverse scattering combined demodulation method used for inhibiting signal crosstalk in a time division multiplexing FP (Fabry-Perot) cavity sensor array to reduce system noise. The method mainly includes the critical steps: processing an interference pulse sampling result of the array by a PGC method to acquire key parameters of impact response by calculation; for each FP cavity in the array, removing interference signals resulted from multiple reflections by means of inverse scattering, acquiring phase information of each FP cavity by means of the PGC demodulation method, reconstructing grating amplitude reflectivity according to PGC demodulation parameters, and acquiring key parameters for next-step iteration. The PGC and inverse scattering combined demodulation method has the advantages that pass parameters are acquired during signal demodulation, operation of a signal processing method is accelerated greatly, and accordingly system practicality is improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, and relates to time-division multiplexed Fabry-Perot cavity (FP cavity) optical fiber sensing array, signal crosstalk, signal demodulation and other technical contents, specifically a phase modulation carrier (PGC) Combined with Inverse Scattering (Inverse Scattering) demodulation method, it is used to suppress signal crosstalk of time-division multiplexed FP cavity fiber sensor array. Background technique [0002] The time-division multiplexing optical fiber sensor array based on the FP cavity structure has the advantages of simple structure, high sensitivity, small size, and light weight, and has important applications in the fields of underwater acoustic signal detection and seismic wave detection. A pair of fiber Bragg gratings (FBG) with the same central wavelength can be used to form a fiber grating FP cavity (FBG-FP) sensor, and with the continuous improvement of fiber gratin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
Inventor 马丽娜蒋鹏胡正良胡永明李海涛熊水东林惠祖
Owner NAT UNIV OF DEFENSE TECH
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