How Distributed Acoustic Sensing works (IMAGE)
Caption
This schematic shows how the Distributed Acoustic Sensing, called DAS, works. A laser pulse is sent from the shore station through a fibre optic cable by an interrogator (a). The fibre has evenly spaced nodes on it, called defects (b). Underwater sounds cause the defects in the fibre to be slightly displaced, which delays the backscatter a signal back to the interrogator, which then interprets the time delay as a strain on the fibre. That in turn can be interpreted as acoustic data.
Credit
Graphic: Marte Finsmyr/Léa Bouffaut
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