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Spectral demodulation method and system of identical wavelength fiber grating

A technology of fiber grating demodulation and fiber grating, applied in the direction of transmitting sensing components, instruments, measuring devices, etc. by using optical devices, to achieve the effect of increasing coverage

Active Publication Date: 2018-11-23
WUHAN WUTOS
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Problems solved by technology

[0004] Aiming at the difficulty of demodulating the wavelength of identical fiber gratings, the present invention proposes a spectral difference method, realizes the monitoring of slight changes in the wavelength of identical fiber gratings, and solves the problem of wavelength analysis of identical fiber gratings

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  • Spectral demodulation method and system of identical wavelength fiber grating
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  • Spectral demodulation method and system of identical wavelength fiber grating

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Embodiment Construction

[0029] 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.

[0030] The wavelength-identical fiber grating spectrum demodulation method of the embodiment of the present invention, such as Figure 4 shown, including the following steps:

[0031] Sampling the spectrum of the identical FBG in the standard state, recording and saving it as the standard spectrum S 0 ;Standard state: the same state that the fiber grating is placed at room temperature.

[0032] Sample the spectrum of the identical fiber grating in the current state, record and save it as the current spectrum S 1 ;

[0033] Current Spectrum S 1 Subtract the standard spectrum S 0 , get the diff...

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Abstract

The invention discloses a wavelength-all-same fiber grating spectrum demodulation method and a fiber grating demodulation system, wherein the method comprises the steps of sampling a spectrum of a wavelength-all-same fiber grating in a standard state, performing recording and storing the sampled spectrum as a standard spectrum S0; sampling the spectrum of the wavelength-all-same fiber grating in a current state, performing recording and storing the sampled spectrum as a current spectrum S1; subtracting the standard spectrum S0 from the current spectrum S1, and obtaining a differential spectrum Sdifferential, wherein Sdifferential=S1-S0; calculating the peak position of the standard spectrum S0 and the differential spectrum Sdifferential; and calculating the wavelength lambda0 of the wavelength-all-same fiber grating in the standard state and the wavelength lambda1 in the current state according to the peak positions of the standard spectrum S0 and the differential spectrum Sdifferential. The method and the system can realize monitoring to small wavelength changes of the wavelength-all-same fiber grating and settle a problem of wavelength resolution of the wavelength-all-same fiber grating.

Description

technical field [0001] The invention relates to the field of optical fiber gratings, in particular to a wavelength-identical optical fiber grating spectrum demodulation method and system. Background technique [0002] Fiber Bragg grating sensors have been widely used in monitoring fields such as fire and structural health. Compared with traditional sensing technology, FBG can be monitored in an array by means of wavelength division multiplexing, that is, FBG sensors with different wavelengths are connected in series to form a wider coverage. However, the way of wavelength division multiplexing is still limited by the wavelength range of the fiber grating demodulation instrument. For example, if the wavelength range of the demodulation instrument is 40nm, and a 2nm area is reserved for each sensor, it can only carry up to 20 fiber grating sensors with different wavelengths. In practical applications, large-scale fire monitoring systems such as storage tanks and tunnels usua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
CPCG01D5/35387
Inventor 钱磊董雷于本化罗显庭覃玮玮杨智龙印新达
Owner WUHAN WUTOS
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