FIELD: metrology.
SUBSTANCE: invention relates to metrology, in particular to reflectometry. Fiber-optic device for detecting vibration effects comprises a series-connected high-stable narrow-band radiation source, an optical signal amplifier, driver-controlled acoustooptic modulator, circulator, controlled optical fiber line, splitter 1 × 2 back scattered signal. Outputs of splitter are equipped with receiving parts with identical compositions from in-series installed weak signal amplifiers, optical filters and radiation receivers; wherein the first receiving part is intended for control of the near-polled section of the monitored line, the second - for monitoring the distant interrogated section of the monitored line; with possibility to adjust signal levels in receiving parts for each monitored section so that all monitored line has signal/noise ratio sufficient for quality registration and control; outputs of receivers are connected to analogue-to-digital converter of computing device.
EFFECT: technical result is an increase in the signal/noise ratio, high dynamic range of the useful signal.
1 cl, 3 dwg
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