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Phase-shift FBG (Fiber Brag Grating) demodulation system

A phase-shifting fiber grating and optical fiber technology, which is applied in the direction of using optical devices to transmit sensing components, can solve the problems of large measurement range and inability to perform multi-point simultaneous sensing, etc., and achieves the effect of large measurement range and high demodulation accuracy.

Pending Publication Date: 2018-06-26
CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to provide a phase-shift fiber grating demodulation system to solve the problem that the existing phase-shift fiber grating sensing system cannot perform multi-point simultaneous sensing, and to realize High demodulation accuracy, can multiplex multiple phase-shifted fiber gratings, and has a large measurement range

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  • Phase-shift FBG (Fiber Brag Grating) demodulation system

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Embodiment Construction

[0029] In order to solve the problems in the prior art, the present invention provides a phase-shifting fiber grating demodulation system based on frequency sweeping method. The nonlinear jitter noise of the frequency-sweeping light source used in the phase-shifted fiber grating demodulation system proposed by the present invention and the narrow-band transmission peak bandwidth of the phase-shifted fiber grating are both on the order of 10pm. If the traditional nonlinear calibration scheme is adopted, the introduced error Larger, so high-precision nonlinear calibration is required. For this reason, the combined absolute wavelength reference based on the fiber optic FP interferometer and the gas absorption chamber is used to calibrate the nonlinearity in the wavelength scanning, and the nonlinear calibration accuracy is improved to the order of pm, and multiple Phase-shifting optical fiber is multiplexed on one optical fiber for multi-point high-precision and large-range sensi...

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Abstract

The invention discloses a phase-shift FBG demodulation system, and aims at solving the problem that a present phase-shift FBG sensing system cannot realize sensing in multiple points simultaneously. The system comprise a sweep-frequency laser, a coupler, first and second circulators, a phase-shift FBG array, a gas absorption room, a fiber FP interferometer, a photoelectric detector group, a data collector and a demodulation module. According to the system, the demodulation precision is high, multiple phase-shift FBGs can be multiplied, and the measuring range is wide.

Description

technical field [0001] The invention relates to the field of optical fiber sensors, in particular to a phase-shifting optical fiber grating demodulation system. Background technique [0002] As a new type of sensor, Fiber Bragg Grating has attracted more and more attention because of its unique advantages, and its application fields are becoming more and more extensive. Compared with traditional electrical and optical sensors, the sensing signal of fiber Bragg grating is wavelength coded without electromagnetic interference, and has high sensitivity and easy multiplexing. When it is affected by physical quantities such as ambient temperature and pressure, its central wavelength will change, so sensors based on fiber gratings can be used to measure changes in external physical quantities. Fiber Bragg grating sensing system has the advantages of corrosion resistance, stable chemical performance, small size, light weight, etc., and can be widely used in measuring physical quan...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35312G01D5/35387G01D5/3539G01D5/35396
Inventor 蔺博梅佳伟
Owner CHINA ACADEMY OF ELECTRONICS & INFORMATION TECH OF CETC