In this paper, high speed demodulation of fiber Bragg grating (FBG) reflectivity spectrum is realized based on time-stretch dispersive Fourier transformation (TS-DFT). The demodulation system consists of mode-locked laser, optical circulator, dispersion compensating fiber, reference FBG, sensing FBG, and data collection and processing module. The time domain mapping spectra of sensing FBG under different temperature fields were obtained in experiments. By comparison with the measured spectra of the optical spectrum analyzer, the high-speed spectral demodulation ability of the system is verified, and the demodulation rate is 51.2 MHz. Combined with the spectral inversion algorithm, the temperature distribution along the axis of sensing FBG is obtained, and the spatial resolution is 200 mm. Therefore, temperature sensing with high speed and high spatial resolution is realized.
YANG Mei, CHEN Na, LIU Zhenmin, SHANG Yana, LIU Shupeng, CHEN Zhenyi, WANG Tingyun
. FBG Temperature Distribution Detection Based on TS-DFT High Speed Spectral Demodulation[J]. Journal of Applied Sciences, 2023
, 41(2)
: 252
-261
.
DOI: 10.3969/j.issn.0255-8297.2023.02.006
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