FIELD: physics.
SUBSTANCE: apparatus includes a highly coherent laser, a pulse modulator, a circulator, a fibre-optic cable with current conductors, optical amplifiers, a sensor optical portion, a signal receiver, a received signal processing unit, two optical switches of N channels, an optical amplifier, an optical-electrical converter, an analogue-to-digital converter, a transmitting optical modem and a receiving optical modem.
EFFECT: longer length of monitoring an extended object, wider frequency band of detected acoustic vibrations.
6 cl, 1 dwg
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