基于锁模激光器的FBG电流传感器高速解调系统

doi:10.3969/j.issn.0255-8297.2024.06.001

Abstract

Abstract: The development goals of reliable, safe, economical, and efficient smart grid place higher demands on the detection rate of current parameters. This paper presents an experimental investigation of high-speed demodulation of fiber Bragg grating (FBG) current sensor, based on magnetostrictive effect and mode-locked laser multiplexing. For the first time, time-stretch dispersive Fourier transformation (TS-DFT) is combined with fiber current sensing techniques. FBG, fixed on the magnetostrictive material, detects the material strain caused by the magnetic field generated by the energized solenoid, enabling current sensing. TS-DFT maps the wavelength shift of FBG caused by stress to the time-domain delay shift in the reflected pulse, facilitating high-speed demodulation. The wavelength multiplexing of the two sensing FBGs is monitored in the current range of 0 to 4.5 A, achieving a demodulation rate of up to 69.6 MHz. This method has broad application prospects in the field of current or magnetic field sensing.

Key words: mode-locked laser, time-stretch dispersive Fourier transformation, magnetostrictive effect, fiber Bragg grating (FBG), fiber current sensor

CLC Number:

P751.1

WANG Hua, HE Qun, TAN Ruchao, WU Dong, FANG Yinuo, MA Yuehui, YAN Kaiquan, MOU Chengbo. High Speed Demodulation System for FBG Current Sensor Based on Mode-Locked Laser[J]. Journal of Applied Sciences, 2024, 42(6): 903-911.

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High Speed Demodulation System for FBG Current Sensor Based on Mode-Locked Laser

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