Distributed Acoustic Sensing (DAS) seismic technology has the capacity, in principle, to provide continuous sensing of elastic vector or tensor wave field quantities, if significant variability in fibre curvature is introduced. Quantitative design and appraisal of candidate fibre shapes, in the presence of gauge-length, dominant seismic wavelength, noise, and other constraints, requires a well-characterized geometrical model. A model of this kind, in which a helix is wound about an arbitrarily curved input cable axis, is discussed in this paper in the context of tensor strain estimation. The special case of a fibre wound into a set of nested helices, referred to as an , is considered in particular. The interplay between gauge-length, reconstruction interval, and the character of both P- and S-wave motion in tensor strain reconstruction is analyzed for standard HWC shapes and their extensions.
Presentation Date: Thursday, September 28, 2017
Start Time: 8:30 AM
Location: 362D
Presentation Type: ORAL
