FIBER-OPTICAL DISTRIBUTION VIBROACOUSTIC SENSOR BASED ON PHASE-SENSITIVE REFLECTOMETER AND METHOD OF IMPROVING ITS CHARACTERISTICS OF SENSITIVITY Russian patent published in 2018 - IPC G01D5/00 

FIELD: measurement.

SUBSTANCE: invention relates to distributed vibro-acoustic fiber-optic sensor systems. A fiber-optic distributed vibro-acoustic sensor based on phase-sensitive reflectometer contains narrow-band radiation source, fiber-optic amplifier that amplifies source radiation, acoustic-optical modulator operating in pulsed mode and introducing frequency shift into optical radiation, fiber optic splitter on M channels in case of M>1, each channel consisting of optical fiber, circulator and fiber optic erbium amplifier in receiving part of channel, amplifier of narrowband optical filter and further photodetector module with output to channel of multichannel ADC with input quantity of not less than number of channels involved. Thus, outputs of all channels are connected to their inputs of multichannel ADC. At output of ADC, digital processor for generation of control pulses, controls, processing and transmission of data, board of frequency-pulse shaper and AOM driver; all fibers of M-channels are laid along each other side by side.

EFFECT: technical result consists in increasing sensitivity to weak vibroacoustic influences on sensor element and in increasing length of sensor sensitive element.

4 cl, 3 dwg