English proficiency:
Research projects:
- 2003−2018 a series of scientific research projects (for Technology Company Schlumberger) «Research of physical processes and analysis of signals in multi-frequency fiber OTDR systems».
- 2020−2022 — Project State assignment for universities FSEG- 2020−0024 «Precision spectroscopy of quantum systems and nanoobjects in a wide range of energies».
- 2019−2021 — Grant from Russian Foundation for Basic Research 19−32−90 262 — «Physico-mathematical model of intermodal fiber-optic interferometer signals with simultaneous effects of various types during spectral interferometric interrogation».
- 2018−2025 a series of scientific research projects (for State Research Center of the Russian Federation — Concern CSRI Elektropribor), «Development and implementation of measurement methods for fiber-optic interferometric sensors».
Research topics:
- Demodulation of interference signals in fiber-optic phase sensors.
- Suppression of polarization fading in fiber-optic interferometric systems.
- Complex multiplexing schemes of sensitive elements in fiber- optic interferometric sensors.
- Models of interferometric signals in complex fiber-optic phase sensors.
Field of study:
Research interests:
- Fiber-optic measuring systems and interferometric devices. Development of complex fiber-optic interference schemes, including schemes with multiplexing of sensitive elements, circuits with FBG, schemes with an external fiber Fabry-Perot interferometer, polarization interferometry circuits, etc.
- Distributed fiber-optic measuring systems based on OTDR and OFDR technologies.
- Construction of analytical signal models for complex fiber-optic circuits.
- Development of interference signal demodulation methods for fiber-optic interferometric systems.
- Polarization effects in fiber-optic systems and devices.
Research highlights:
- Patent WO2013066654 A1, 2013; Hartog A.H., Liokumovich L.B. «Phase-sensitive coherent OTDR with multi-frequency interrogation».
Main publications:
«Abrupt λ/2 Demodulation Errors in Spectral Interferometry: Origins and Suppression» / Ushakov N.A., Liokumovich L.B. // IEEE Photonics Technology Letters, 32 (18), 2020, art. no. 9 163 172, pp. 1159 — 1162
«Pulse Wave Velocity Measurement with Multiplexed Fiber Optic Fabry-Perot Interferometric Sensors» / Ushakov N.A., Markvart A.A., Liokumovich L.B. // IEEE Sensors Journal, 20 (19), 2020, art. no. 9 099 477, pp. 11 302 — 11 312,
«Smartphone-Based Interrogation of a Chirped FBG Strain Sensor Inscribed in a Multimode Fiber» / Markvart A.A., Liokumovich L.B., Medvedev I.O., Ushakov N.A. // Journal of Lightwave Technology, 39 (1), 2021, art. no. 9 200 642, pp. 282 — 289.
«Signal detection algorithms for interferometric sensors with harmonic phase modulation: Evaluation of additive noise effects» / Liokumovich L., Muravyov K., Sochava A., Skliarov P., Ushakov N. // Applied Optics, 60 (20), 2021, pp. 5959
«Singlemode-Multimode-Singlemode Fiber-Optic Interferometer Signal Demodulation Using MUSIC Algorithm and Machine Learning» / Ushakov N., Markvart A., Liokumovich L.// Photonics. 2022. Т. 9. No 11. С. 879.