A Modularized Ultra-Weak Fiber Bragg Grating Demodulation System

Abstract

In order to satisfy the needs of field monitoring and system deep integration, a modularized ultra-weak fiber Bragg grating (UW-FBG) demodulation system is first proposed. The working principle of the system is analyzed, and the relationship between the spatial resolution, reflectivity and the number of gratings at the same wavelength is discussed. The embedded hardware circuit is used to collect and cache the high-speed A/D data of 250 MSPS, cooperate with the C# host computer software to complete the positioning, wavelength analysis and processing of the grating array, and realize the real-time demodulation of the 4-channel sensor array.

System Specifications

• Sampling Rate: 250 MSPS
• Power Consumption: <13 W
• Sensing Distance: >10 km per channel
• Channels: 4
• Waveform Acquisition: >50 Hz
• Dimensions: 230×170×40 mm

Authors

Y.-L. Xiong, L. Chen, Z.-H. Luo, et al. — Hubei Engineering Research Center of Weak Magnetic-field Detection & College of Science, China Three Gorges University

Keywords

Ultra-weak fiber Bragg grating; Wavelength demodulation; Sensor; FPGA; Modularization

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