Fibre-optic sensor cable for underground installation in permafrost ground, modular design (optical tube made of polymer material PBT, inside which optical fibres are located in the medium of hydrophobic filler) with the number of fibres from 2 to 38, with outer sheath made of polyethylene, non-burning, with a double armour twist made of galvanised steel wire, with an intermediate sheath made of polyethylene, with a central power element made of polymer material (PBT), inside which optical fibres with zero excess length in the medium of hydrophobic filler are located, with a limiting attenuation of 0.22 dB/km.
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