DISTRIBUTED SENSOR OF ACOUSTIC AND VIBRATION ACTIONS Russian patent published in 2014 - IPC G01D5/353 G01H9/00 

FIELD: measurement equipment.

SUBSTANCE: invention relates to distributed measurements, and namely to distributed sensors of acoustic and vibration actions. In a distributed sensor of acoustic and vibration actions, which includes a sensitive element in the form of a fibre-optic cable and a coherent phase-sensitive optic reflectometer optically connected to it through an optic interface and containing a source of periodic sequence of optic pulses and a receiver of scattered radiation with a photodetector, which are optically connected to the interface, which is intended to convert scattered optic radiation to an electric signal supplied to a processing unit, with that, a source of periodic sequence of optic pulses and the processing unit are electrically connected to a control and synchronisation unit, and the source of periodic sequence of optic pulses and/or the receiver of scattered radiation is of a multichannel type and has the number of channels of at least two and is provided with a possibility of recording reflectograms formed in each of the channels, the receiver of scattered radiation includes a Mach-Zehnder or Michelson nonequiarm interferometer with faraday mirrors; with that, the interferometer has at least two output channels, each of which is connected to the photodetector, and the control and synchronisation unit has the possibility of providing separation and independent processing of signals from each of the output channels of the interferometer.

EFFECT: increasing guaranteed sensitivity and range of action of a distributed sensor of acoustic and vibration actions.

5 cl, 7 dwg