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A kind of spectral demodulation method and demodulation device based on vernier effect

A technology of vernier effect and demodulation method, which is applied in the field of spectral demodulation method and demodulation device based on vernier effect, which can solve the problems of low precision of cascaded spectral envelopes, and achieve the effect of high sensitivity and precision

Active Publication Date: 2019-08-13
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at the defects of the prior art, the object of the present invention is to provide a spectral demodulation method and its demodulation device based on the vernier effect, aiming at solving the problem of obtaining the cascaded spectral package of the cascaded optical fiber interferometer using the existing spectral fitting technology. The technical problem of low network accuracy

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  • A kind of spectral demodulation method and demodulation device based on vernier effect
  • A kind of spectral demodulation method and demodulation device based on vernier effect
  • A kind of spectral demodulation method and demodulation device based on vernier effect

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[0038] 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.

[0039]Aiming at the defects and requirements of the existing demodulation technology, the present invention proposes a spectral demodulation method based on the vernier effect. This method can be applied to most optical fiber In-line MZI sensors, and improves the accuracy of obtaining the cascaded spectral envelope. At the same time The amplification of spectral drift is realized, which overcomes the disadvantages of the traditional vernier benefit spectral fitting method, and the extraction of the envelope is very precise, which can amplify the spectral drift by an order of magnitude. This method ...

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Abstract

The invention discloses a spectrum demodulation method and demodulation device based on a vernier effect. The demodulation method includes the steps of measuring a vernier effect spectrum of a cascadestructure, performing fast Fourier transform on the spectrum, an obtained frequency spectrum having three clusters of frequency components, selecting a spatial frequency component with a minimum frequency value, extracting the spatial frequency through a Gaussian filter, and performing fast Fourier transform inversion on the extracted spatial frequency to obtain an envelope of a cascade vernier spectrum. A vernier effect is formed through cascade reference of In-line MZI and the envelope of the vernier spectrum is extracted, and under the same condition, the drift amount of the cascade vernier spectrum envelope is about FSR(R) / (FSR<S>-FSR<R>) times of that of a sensing In-line MZI spectrum, thereby realizing amplification of sensitivity.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, and in particular relates to a vernier effect-based spectrum demodulation method and a demodulation device thereof. Background technique [0002] Compared with traditional electrical sensing technology, optical fiber sensing technology has the advantages of small size, light weight, high sensitivity, anti-electromagnetic interference, suitable for working in harsh environments, and easy multiplexing networking. Optical fiber sensing technology has been widely used In all areas of people's production and life. Among various types of fiber optic sensors, the fiber optic online Mach-Zehnder Interferometer (In-line Mach-Zehnder Interferometer, In-line MZI) sensor is a focus of research. Compared with the traditional Mach-Zehnder interferometer, the In-line MZI is an all-fiber structure with a more compact structure and has the advantages of high sensitivity, good stability, and low cost. [000...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/26G01B9/02
CPCG01B9/02044G01B9/02083G01D5/266G01D5/268
Inventor 鲁平廖浩刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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