A fiber Bragg grating demodulation method and device based on chaotic light source

Abstract

The invention discloses a method and device for demodulating a fiber Bragg grating based on a chaotic light source, and belongs to the technical field of optical fiber demodulation. The assistance ofa thermostatic bath and a thermostatic control circuit are added, chaotic light is generated through the chaotic light source, and demodulation is performed on the fiber Bragg grating. The whole device is composed of a semiconductor laser, a polarization controller, an optical fiber circulator, an adjustable optical attenuator, a plurality of optical fiber couplers, an optical isolator, an F-P etalon, a reference grating, a plurality of fiber Bragg gratings, a thermostatic control circuit, an F-P filter, a photoelectric detector, an amplifying circuit, an A / D converter, an FPGA acquisition system, a D / A converter, sawtooth voltage, a display and a thermostatic bath. The device improves the performance of the existing fiber Bragg grating demodulation device, has the advantages of large measurement range, high signal-to-noise ratio and high resolution, and is applicable to occasions in which the temperature difference is great and ultra-long distance transmission is required to be performed.

Description

technical field [0001] The present invention relates to fiber grating demodulation technology, in particular to a fiber Bragg grating demodulation method and device based on a chaotic light source. Background technique [0002] In recent years, the rapid development of Fiber Bragg Gratings has provided a platform for the application of Fiber Bragg Grating sensing technology. Compared with ordinary fiber optic sensors, Fiber Bragg Gratings have the advantages of simple structure, small size, and high sensitivity. Therefore, in structural health monitoring, It has been applied in many fields such as aerospace. Among them, the fiber Bragg grating demodulator based on the tunable filtering method has the advantages of large measurement range, high measurement accuracy, and fast demodulation speed, and is suitable for long-distance detection. However, the fiber Bragg grating uses the wavelength of the grating as the sensing medium, and senses the change of the external physical ...

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