11 February 2015

Distributed Acoustic Sensing (DAS) is a relatively novel technology, which uses a fibre-optic cable as sensor. Advantages are that the cable is passive, it does not have separate detectors and the channel spacing can be set by the instrument. DAS has already found applications in monitoring of hydraulic fracturing and VSPs. A downside is that a straight fibre has no broadside sensitivity and can therefore not be used for reflection seismic with horizontal cables. A helically wound cable (HWC) solves that problem; the video describes a field trial, which confirms the theoretically expected isotropic sensitivity of the HWC for P-waves.

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