The paper presents simulating and experimental results of flowmeter operation with induction heating, where fiber Bragg gratings were used as sensitive elements of temperature sensors. The operating principle of flowmeter based on cross-correlation method. During the experiment, it was detected time response of heat pulse from 0.2 s to 0.5 s that corresponds to a flow velocity range 0.1-0.5 m/s.

Theoretical calculations and experimental study of the acoustic sensitivity suppression level of optical fiber inside the cables of a special design in the frequency range 20-20000 Hz were carried out. A high degree of reduction in acoustic sensitivity has been achieved. It was more than 29 dB suppression relatively to the standard single-mode SMF - 28 fiber in a polymer shell. This result can significantly increase the sensitivity of measuring systems based on fiber-optic interferometers.