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Spectrum demodulation method and demodulation device based on vernier effect

A technology of demodulation device and demodulation method, which is applied in the direction of using optical devices, using optical devices to transmit sensing components, measuring devices, etc., can solve the problems of low accuracy of cascaded spectral envelopes, and achieve high sensitivity and high precision Effect

Active Publication Date: 2018-03-30
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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[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but 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 cascaded spectral envelopes. The amplification of spectral drift is realized, which overcomes the drawbacks of the traditional vernier-benefit spectral fitting method, and the extraction of the envelope is very accurate, which can amplify the spectral drift by an order of magnitude. The method can be applied ...

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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 spectral demodulation method and a demodulation device based on a vernier effect. 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, easy to multiplex networking, etc. 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 In-line Mach-Zehnder Interferometer (In-line MZI) sensor is a focus of research. Compared with traditional Mach-Zehnder interferometers, In-line MZI is an all-fiber structure with more compact structure, high sensitivity, good stability and low cost. [0003] The interference spectrum of In-line MZI is usually generated by the mutual inter...

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Application Information

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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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