Figure 10.Signal while walking.Figure 11

Electronics 2021, 10, 3094 11 of 20
Table 3.
Observation of amplitude for signal.
S. No.
Condition
Observation
Entry 1
Walking
Amplitude increase up to Entry 2
Running
Amplitude increase up to Entry 3
Stamping
Gradual increase in amplitude at an regular interval
Figures
13
–
15
shows the signal for the motion of several people over a buried fiber cable. The observation of the magnitude increase for walking, running, tapping performed across the cables is illustrated in Table
4
Figure 13.
Signal while walking.
Figure 14.
Signal while running.

Electronics 2021, 10, 3094 12 of 20
Figure 15.
Signal while tapping.
Table 4.
Observation of amplitude for signal.
S. No.
Condition
Observation
Entry 1
Walking
Amplitude increase up to Entry 2
Running
Amplitude increase up to Entry 3
Stamping
Gradual increase in amplitude at an regular interval
Figures
16
and
17
shows the signal path and the spectrogram of a one-person walk. It can be seen in the graph that there is a peak when the person places their feet on the cable.
Figure 16.
Plot of signal for the walk of a single person.

Electronics 2021, 10, 3094 13 of 20
Figure 17.
Spectogram of signal for the walk of a single person.
Figures
18
and
19
shows the signal pattern and the single-person performance spec- trogram. The graph shows a peak when the person reaches the nearby cable and crosses the sensor cable.

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