ИСТИНА

There is a separate direction in developing Distributed Acoustic Sensing (DAS) by constructing its own seismic cable line, in which the optic fibres have a defined orientation and location, as well as computated connection with the ground. Special cables are being developed which have a better signal-to-noise ratio and good transmission of the impact on the fibre with reliable mechanical protection of the fibre. As DAS sensors are sensitive to the temperature and strain, fibers are being developed that have widely differing frequency response factors. It is possible to develop dual-purpose communication cables which include DAS. The main thing here is the presence in the cable of the following items: local polling units, optic repeaters and amplifiers that serve to DAS. Special fibers have a significantly higher cost. In this paper we analyze metrological characteristics of special DAS lines.