Optical fiber grating-based monitoring system

A fiber grating and monitoring system technology, which is applied in the fields of optical fiber sensing technology, civil engineering, and rail transit, can solve the problems of a large number of fiber gratings, a complex structure, and an expensive demodulation system, and achieves low price, easy implementation, and simple production. Effect

Inactive Publication Date: 2011-09-14
BEIJING JIAOTONG UNIV
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Problems solved by technology

In a general distributed fiber grating monitoring system, the number of sensing fiber grating arrays and matching fiber grating arrays are the same, and the wavelengths are completely matched. The number of fiber gratings required is large, the structure is relatively complex, and the demodulation system is expensive

Method used

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  • Optical fiber grating-based monitoring system
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Embodiment Construction

[0011] A fiber grating-based monitoring system, such as figure 1 . The output of its broadband light source 1 is connected to the first port 21 of the four-port circulator 2, and the second port 22 of the circulator is connected in series with the first to nth narrowband fiber Bragg gratings 31, 32..., 3n, and the first port of the circulator The three ports 23 are connected to one end of the broadband fiber grating 30 , the other end of the broadband fiber grating 30 is connected to the first photodetector 41 , and the fourth port 24 of the circulator is connected to the second photodetector 42 .

[0012] The wavelengths of the first to the nth narrowband fiber Bragg gratings are the same, but the reflectivity is different, where n≥2.

[0013] The wavelengths of the first to the nth narrowband fiber Bragg gratings adopt the existing range of 1500nm-1600nm, and the present invention uses any wavelength within this range, and the wavelengths are the same.

[0014] The reflect...

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Abstract

The invention discloses an optical fiber grating-based monitoring system, relates to the optical fiber raster-based monitoring system and is suitable for the fields, such as optical fiber sensing technology, civil engineering, rail traffic and the like. A wideband light source (1) of the monitoring system is connected with the first end (21) of a four-port circulator; the second end (22) of the circulator is connected with the first to the nth narrow band Fiber Bragg Gratings (31, 32,..., and 3n) in series; the third end (23) of the circulator is connected with one end of the wide band optical raster (30); the other end of the wide band optical raster (30) is connected with a first photoelectric detector (41); and the fourth end of the circulator is connected with a second photoelectric detector (42). The first to nth narrow band Prague optical rasters have the same wavelength and different reflectivity, wherein n is more than or equal to 2. The system has the advantages of system easy manufacture, simple structure and high performance ratio.

Description

technical field [0001] The invention relates to a monitoring system based on an optical fiber grating, which is suitable for the fields of optical fiber sensing technology, civil engineering, rail transportation and the like. Background technique [0002] Optical fiber has dual functions of sensing and transmission, and has the advantages of flexibility, light weight, anti-electromagnetic interference, high temperature resistance, corrosion resistance, wide transmission frequency band, and embedability. In addition to many advantages of fiber optic sensors, fiber grating sensors also have some obvious advantages over other fiber optic sensors. As a device for spectral separation and optical wavelength selection, the signal is not affected by factors such as bending loss, connection loss, light source fluctuation, and detector aging; it avoids problems such as ambiguity in phase measurement of interferometric fiber optic sensors. Multiple fiber gratings are connected in seri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08C23/06G01J1/42
Inventor 周倩宁提纲裴丽李晶胡旭东温晓东
Owner BEIJING JIAOTONG UNIV
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