Bozhi Zhang, Ke Liu, Kun Liu, Junfeng Jiang, Man Zhang, Tiegen Liu. Research on dynamic variance threshold algorithm based on distributed fiber vibration sensor system[J]. Opto-Electronic Engineering, 2023, 50(2): 220205
- Opto-Electronic Engineering
- Vol. 50, Issue 2, 220205 (2023)
Fig. 1. Algorithm flow chart
Fig. 2. Structural diagram
Fig. 3. Signal characteristics of two quiet positions and their corresponding positions in the spectrum (abscissa is position/m, ordinate is frequency/Hz)
Fig. 4. The data of 1000 frames at the disturbance location and the corresponding position of its spectrum (abscissa is position/m, ordinate is frequency/Hz)
Fig. 5. Gaussian blur. (a) Before blurring; (b) Average blurring with a width of 20; (c) Gaussian fuzzy. The standard deviation sigma of Gaussian fuzzy is equal to 3, and the width is 21 points
Fig. 6. Test site
Fig. 7. Raw data
Fig. 8. Variance treatment
Fig. 9. Disturbance prescription difference curve
Fig. 10. Peak seeking algorithm
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