Fig 1.
Relative vibration sensitivity of transformer on delay fiber.
Fig 2.
Relationship between FOCT relative error and linear birefringence.
Fig 3.
Experimental system for optical cable impact.
Fig 4.
Measurement results of DC current with multiple impacts at position 1: (a) 1st measurement; (b) 2nd measurement; (c) 3rd measurement; (d) 4th measurement.
Fig 5.
Measurement results of DC current with multiple impacts at position 2: (a) 1st measurement; (b) 2nd measurement; (c) 3rd measurement; (d) 4th measurement.
Fig 6.
Measurement results of DC current with multiple impacts at position 3: (a) 1st measurement; (b) 2nd measurement; (c) 3rd measurement; (d) 4th measurement.
Fig 7.
Schematic diagram of fiber sensing ring vibration experiment.
Fig 8.
Physical diagram of fiber sensing ring vibration experiment.
Fig 9.
Physical diagram of sensing fiber ring installation.
Fig 10.
Target and measured current signal under different accelerations and frequencies of sinusoidal vibration: (a) 0.5 g-10 Hz; (b) 0.5 g-150 Hz; (c) 0.5 g-2000 Hz; (d) 2 g-10 Hz; (e) 2 g-2000Hz.
Fig 11.
Dividing current signal under different accelerations and frequencies of sinusoidal vibration: (a) 0.5 g-10 Hz; (b) 0.5 g-150 Hz; (c) 0.5 g-2000 Hz; (d) 2 g-10 Hz; (e) 2 g-2000Hz.
Fig 12.
Target and measured current signal under different accelerations and durations of semi-sinusoidal vibration: (a) 5 g-6 ms; (b) 5 g-30 ms; (c) 10 g-6 ms; (d) 10 g-16 ms.
Fig 13.
Dividing current signal under different accelerations and durations of semi-sinusoidal vibration: (a) 5 g-6 ms; (b) 5 g-30 ms; (c) 10 g-6 ms; (d) 10 g-16 ms.
Table 1.
RMS comparison before and after compensation through ANN-based filtering.
Fig 14.
Current measurement compensation results at position 1 under impact vibration: (a) original signal; (b) compensated signal through ANN-based filtering.
Fig 15.
Current measurement compensation results at position 2 under impact vibration: (a) original signal; (b) compensated signal through ANN-based filtering.
Fig 16.
Current measurement compensation results at position 3 under impact vibration: (a) original signal; (b) compensated signal through ANN-based filtering.
Table 2.
RMS comparison before and after compensation based on FIR filtering.
Fig 17.
Error compensation results under semi-sinusoidal and sinusoidal vibration based on the proposed FIR filter: (a) measured current signal after compensation (semi-sinusoidal); (b) measurement error after compensation (semi-sinusoidal); (c) measured current signal after compensation (sinusoidal); (d) measurement error after compensation (sinusoidal).