Bragg grating high-speed demodulating system based on cascade-connection long period fiber grating

A technology of long period grating and fiber grating is applied in the field of high-speed demodulation system of Bragg grating, which can solve the problems of small wavelength range and low demodulation accuracy, and achieve the effects of simple production, cost saving and long period.

Inactive Publication Date: 2010-02-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

This scheme is suitable for dynamic and static measurement, and has the advantages of low cost and conven

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  • Bragg grating high-speed demodulating system based on cascade-connection long period fiber grating
  • Bragg grating high-speed demodulating system based on cascade-connection long period fiber grating
  • Bragg grating high-speed demodulating system based on cascade-connection long period fiber grating

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Embodiment Construction

[0027] by figure 1 It can be seen that the specific composition of a Bragg grating high-speed demodulation system based on cascaded long-period fiber gratings of the present invention is that the light emitted by a broadband light source 1 (a broadband light source with a usable wavelength range of 1520nm-1570nm) passes through a single-mode fiber 2 The Y-type coupler 3 is incident on the fiber Bragg grating sensor 4, and the reflected light is coupled into the cascaded long-period grating 6 through the single-mode fiber 5 through the Y-type coupler 3 and enters the high-speed photodetector 7. So far, the optical signal is converted into a voltage signal, and the signal is amplified and filtered by the conditioning circuit 8 and then transmitted to the computer 10 by the data acquisition card 9 for display.

[0028] The cascaded long-period grating is composed of at least two long-period gratings connected in series, and each long-period grating has the same center wavelength. The...

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Abstract

The invention discloses a Bragg grating (FBG) high-speed demodulating system based on cascade-connection long period fiber grating (LPFG), belonging to the optical-fiber intelligent structural healthmonitoring field. The system comprises a broadband light source (1) which is connected with the output end of a Y-shaped fiber optic coupler (3) by monomode optical fiber (2), the input end of the Y-shaped fiber optic coupler (3) is connected with a Bragg grating (4), the other output end thereof is connected with a cascade-connection long period fiber grating (6), the other end of the cascade-connection long period fiber grating is connected with a high-speed photoelectric detector (7), the output end of the high-speed photoelectric detector is connected with a conditioning circuit (8) whichis connected to a computer (10) which his connected with a data acquisition card (9). A demodulating method effectively combines the characteristics of the cascade-connection long period fiber gratingand the monitoring technology of central wavelength of a fiber bragg grating sensor together, has the advantages of high sensitivity, high demodulating speed and low cost, and can be used for shocking and vibrating monitoring of aerospace flight vehicles, bridges, large dams, underwater construction and the like.

Description

Technical field [0001] The invention relates to a Bragg grating high-speed demodulation system based on cascaded long-period fiber gratings, which belongs to the field of optical fiber intelligent material structure health monitoring. Background technique [0002] The application of fiber grating sensors is an ascendant field with very broad prospects for development. At present, the most important obstacle to the large number of practical applications of fiber grating sensors is the demodulation of the sensing signal. Demodulation uses the characteristics of wavelength encoding of fiber gratings, and the change state of the sensor signal can be obtained through wavelength demodulation. Research and development of demodulation systems suitable for practical engineering applications and reducing costs are crucial issues for the promotion of fiber grating sensors in practical engineering applications. [0003] At present, the practical demodulation system of fiber grating sensing si...

Claims

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Application Information

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IPC IPC(8): G02F2/00
Inventor 曾捷梁大开芦吉云胡兴柳陆观张小丽
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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