DEVICE FOR MONITORING VIBROACOUSTIC CHARACTERISTICS OF EXTENDED OBJECTS Russian patent published in 2024 - IPC G01B9/00 

FIELD: measuring.

SUBSTANCE: invention can be used for monitoring of vibroacoustic characteristics of extended objects. Essence of the invention consists in the fact that a device for monitoring the vibroacoustic characteristics of extended objects, comprising a functionally connected source of laser radiation, double-arm Mach-Zehnder interferometer with input and output splitters and the first and second fibre-optic sensitive elements built into the same arms, the third fibre-optic sensitive element connected to the output of the output splitter, photodetectors of transmitted and reflected optical signals and a processing and control unit, wherein the processing and control unit is equipped with a first and second subcarrier frequency generating unit with a subcarrier difference frequency generating unit, in each arm of the Mach-Zehnder interferometer there is a controlled optical modulator, the input of which is connected to the corresponding output of the input splitter, the output is connected to the input of the corresponding fibre-optic sensitive element, and the control input is connected to the corresponding output of the device for generating the first and second subcarrier frequency, transmitted and reflected optical signal photodetectors are equipped with in-series installed band-pass filters and synchronous detectors of transmitted and reflected optical signal, respectively, so that the input of the next one is connected to the output of the previous one, and outputs of synchronous detectors are connected to corresponding inputs of processing and control unit, wherein the output of the subcarrier frequency difference frequency generating unit is connected in parallel to the second input of the synchronous detector of the transmitted optical signal and to the synchronous detector of the reflected optical signal through a differential frequency doubler installed at its second input.

EFFECT: providing the possibility of increasing the quality of the probing signal.

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