A Fiber Bragg Grating Sensor Demodulation Device Based on Dual Arrayed Waveguide Gratings

Abstract

The invention discloses a fiber grating sensor demodulation device based on dual arrayed waveguide gratings, which comprises a light source, an optical circulator, an optical splitter, a first arrayed waveguide grating, a second arrayed waveguide grating, first optical signal detectors, second optical signal detectors and a signal acquisition and processing unit, wherein the first arrayed waveguide grating comprises n channels, each channel is connected with the corresponding first optical signal detector, and the n first optical signal detectors are connected with the signal acquisition and processing unit; and the second arrayed waveguide grating comprises n channels, each channel is connected with the corresponding second optical signal detector, and the n second optical signal detectors are connected with the signal acquisition and processing unit. Thus, high-dynamic range continuous wavelength demodulation can be realized.

Description

technical field [0001] The invention relates to the technical field of sensor demodulation, in particular to a fiber grating sensor demodulation device based on double arrayed waveguide gratings. Background technique [0002] FBG sensing system has been widely used in real-time detection of building health status, composite material working status, remote sensing test of cables and pipelines, electromagnetic measurement in power system and many other fields. Among them, the FBG demodulator is the core equipment in the FBG sensing system, and its performance directly affects the measurement accuracy, measurement range, and sampling frequency of the FBG sensing system. The FBG demodulation equipment based on the arrayed waveguide grating (AWG) can obtain the corresponding FBG center wavelength through the output optical signal intensity ratio of the adjacent channels of the AWG chip, which can realize the FBG center wavelength demodulation with high precision and high speed, a...

AI Technical Summary

Problems solved by technology

However, this AWG demodulation device cannot realize continuous wavelength demodulation with a high dynamic range: when the central wavelength of the FBG is close to the central wavelength of the AWG channel, the optical signal can only be measured at the output end of one channel of the AWG chip, and the wavelength demodulation cannot be realized; There are multiple dead zones in the demodulation range formed by multiple AWG channels, which limits the dynamic demodulation range of AWG demodulation equipment

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