Fig. 6
From: Marine reef soundscape monitoring with fiber-optic distributed acoustic sensing
Diver detection and tracking using fiber-optic DAS. (a) Diver’s trajectory along the 50-m fiber section, including hydrophone location. (b) Hydrophone spectrogram showing acoustic activity at Points 1, 3, and 5. (c) 40-60 Hz bandpass-filtered spatiotemporal graph from DAS recordings, depicting the diver’s movement pattern.
