Dr. Gennadii E. Kotkovskii Profile

Dr. Gennadii E. Kotkovskii

Assistant Professor at National Research Nuclear Univ MEPhI

SPIE Involvement:

Author

Publications (36)

SPIE Journal Paper | 14 August 2024

Real-time detection of single microcrystals of nitro compounds by terahertz imaging

Andrei Plekhanov, Artem Akmalov, Gennadii Kotkovskii, Yury Kuzishchin, Igor Martynov, Evgenii Osipov, Alexander Chistyakov

OE, Vol. 63, Issue 08, 084104, (August 2024) https://doi.org/10.1117/12.10.1117/1.OE.63.8.084104

KEYWORDS: Terahertz radiation, Particles, Absorption, Video, Cameras, Reflection, Optical transmission, Optical engineering, Mie scattering, Principal component analysis

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SPIE Journal Paper | 23 March 2023

Study of terahertz reflection spectra of optically thin RDX samples by terahertz imaging with spectral resolution

Andrei Plekhanov, Artem Akmalov, Gennadii Kotkovskii, Konstantin Kozlovskii, Yury Kuzishchin, Igor Martynov, Evgenii Maksimov, Evgenii Osipov, Alexander Chistyakov

OE, Vol. 62, Issue 03, 034109, (March 2023) https://doi.org/10.1117/12.10.1117/1.OE.62.3.034109

KEYWORDS: Terahertz radiation, Reflection, Millimeter wave imaging, Video, Cameras, Spectral resolution, Absorption, Scattering, Particles, Laser radiation

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Proceedings Article | 28 October 2022 Paper

Use of dopants for detection of vapors of explosives by laser field asymmetric ion mobility spectrometer

Artem Akmalov, Alexander Chistyakov, Gennadii Kotkovskii, Vitaly Kostarev

Proceedings Volume 12275, 1227502 (2022) https://doi.org/10.1117/12.2635924

KEYWORDS: Ions, Ionization, Explosives, Spectroscopy, Pulsed laser operation, Signal to noise ratio, Laser energy, Sensors, Electrons, Molecules

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Proceedings Article | 28 October 2022 Presentation + Paper

Photostability of luminophores sensitive to vapors of nitroaromatic compounds in a porous silicon microcavity

T. Kharinoeva, I. Martynov, E. Osipov, G. Kotkovskii, A. Chistyakov

Proceedings Volume 12275, 1227504 (2022) https://doi.org/10.1117/12.2636334

KEYWORDS: Luminescence, Optical microcavities, Oxygen, Silicon, Sensors, Polymers, Mirrors, Etching, Diffusion

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Proceedings Article | 28 October 2022 Presentation + Paper

Stationary two-unit detector of explosives with a light detector module based on traditional ion mobility spectrometry

Alexander Chistyakov, Gennadii Kotkovskii

Proceedings Volume 12275, 1227503 (2022) https://doi.org/10.1117/12.2635927

KEYWORDS: Ions, Spectroscopy, Ultraviolet radiation, Explosives, Optical fibers, Molecules, Sensors, Pulsed laser operation, Ionization

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Proceedings Article | 28 October 2022 Poster + Paper

Detection of objects hidden behind various barriers using the THz radiovision method

A. Akmalov, G. Kotkovskii, K. Kozlovskii, E. Maksimov, I. Martynov, E. Osipov, A. Plekhanov, Yu. Kuzishchin, A. Chistyakov

Proceedings Volume 12275, 122750J (2022) https://doi.org/10.1117/12.2636168

KEYWORDS: Terahertz radiation, Explosives, Explosives detection, Antennas, Video, Packaging, Reflection, Imaging spectroscopy, Reflectivity

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Proceedings Article | 12 September 2021 Presentation + Paper

Detection of trace mm- and sub-mm particles of organic substances using THz imaging with spectral resolution

A. Akmalov, G. Kotkovskii, K. Kozlovskii, E. Maksimov, I. Martynov, E. Osipov, A. Plekhanov, Yu. Kuzishchin, A. Chistyakov

Proceedings Volume 11869, 1186907 (2021) https://doi.org/10.1117/12.2599920

KEYWORDS: Terahertz radiation, Spectral resolution, Bandpass filters, Imaging spectroscopy, Explosives, Scattering

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Proceedings Article | 12 September 2021 Presentation + Paper

Portable aerosol sampler with liquid phase for collection of biopathogens at subzero temperatures

Artem Akmalov, Sergei Belenok, Vitaly Kostarev, Gennadii Kotkovskii, Alexander Chistyakov

Proceedings Volume 11869, 118690B (2021) https://doi.org/10.1117/12.2597974

KEYWORDS: Liquids, Particles, Aerosols, Biological research, Atmospheric particles, Bioalcohols, Microorganisms

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Proceedings Article | 12 September 2021 Presentation

Improvement of explosive vapors recognition by variation of drift gas composition inside laser FAIMS

Gennadii Kotkovskii, Alexander Chistyakov, Artem Akmalov, Vitaly Kostarev

Proceedings Volume 11869, 1186909 (2021) https://doi.org/10.1117/12.2597976

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In this paper we study the influence of the carrier and drift gas composition on ionization processes taking place inside drift chamber of field asymmetric ion mobility spectrometer with laser ionization. Solid state nanosecond laser of YAG:Nd 3+ type with fourth harmonic unit (λ = 266 nm, τpulse = 6 ns, E pulse = 700 – 2500 μJ, ν = 10 – 20 Hz) was used for negative ion generation. In this study we experimentally discover the features of laser ionization of four nitro-compounds: cyclotrimethylenetrinitramine (RDX), cyclotetramethylenetetranitramine (HMX), pentaerythritol tetranitrate (PETN), trinitrotoluene (TNT) explosives. Drift and sample carrier gas were prepared by mixing purified air with different amounts of water vapor and organic dopants. Ion mobility increments were calculated after calibration of field asymmetric ion mobility spectrometer (FAIMS) based on published data for TNT and Iodine and measured alternating separation field waveform. The experimental setup also included drift time ion mobility spectrometer (IMS) which was used to verify linear ion mobility spectra to supplement ion mobility increment values, obtained by FAIMS. Previous studies of laser ionization with optimization of intensity and pulse repetition rates gave LOD values well below 10−15 g/cm3: 3 × 10−15 g/cm3 for RDX, 8 × 10−15 g/cm3 for PETN and less than 3 × 10−15 g/cm3 for HMX. Common ideas about ionization mechanisms of nitro-based explosives propose that indirect processes with ion-molecular reactions substantially contribute to negative ion formation as well as resonant enhanced multi photon ionization (REMPI) direct processes. Ionization process starts with electron generation by organic impurities in atmospheric air. These organic compounds have low ionization energy and require less than two photons to ionize. Current research involves doping air sample with such substances as: toluene acetone, naphthalene and chloroform at different UV irradiation modes. Such compounds can act as electron source for rising TNT and RDX ion signal levels above background. Such selectivity enhancement can be a step on the way to achieving even lower detection limits to sense trace explosive vapor concentrations in real conditions.

Proceedings Article | 12 September 2021 Presentation + Paper

Preconcentration of vapors of low-volatile explosives for ion mobility spectrometry

Artem Akmalov, Alexander Chistyakov, Gennadii Kotkovskii, Vitaly Kostarev, Kirill Lavrinenko

Proceedings Volume 11869, 1186905 (2021) https://doi.org/10.1117/12.2597962

KEYWORDS: Ions, Explosives, Spectrometers, Molecules, Chemical analysis

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Proceedings Article | 12 September 2021 Presentation + Paper

Photon counting mode for advanced real-time detection of bioaerosols

Artem Akmalov, Alexander Chistyakov, Gennadii Kotkovskii, Yury Kuzishchin, Igor Martynov, Evgenii Osipov, Alexandra Pashkevich, Artem Tkachuk, Bakhtiyar Verdiev, Artem Alatyrev

Proceedings Volume 11869, 1186906 (2021) https://doi.org/10.1117/12.2600476

KEYWORDS: Atmospheric particles, Photodetectors, Aerosols, Luminescence, Light emitting diodes, Curium, Photon counting, Particles, Analog electronics, Signal detection

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Proceedings Article | 20 September 2020 Presentation + Paper

Portable aerosol collector with liquid circulation mounted on a drone

Artem Akmalov, Sergei Belenok, Anastasia Kadyrova, Veronika Kirillova, Vitaly Kostarev, Gennadii Kotkovskii, Alexander Chistyakov

Proceedings Volume 11542, 115420J (2020) https://doi.org/10.1117/12.2572653

KEYWORDS: Aerosols, Liquids, Statistical analysis, Atmospheric particles, Microorganisms, Biological research, Pathogens, Solar concentrators, Atmospheric monitoring, Particles

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Proceedings Article | 20 September 2020 Presentation + Paper

About impurities in cyclotrhylmethylentrinitramine and the possibility of detecting its vapor

Artem Akmalov, Alexander Chistyakov, Gennadii Kotkovskii, Vitaly Kostarev, Alexander Kulintsov, Kirill Lavrinenko

Proceedings Volume 11542, 115420K (2020) https://doi.org/10.1117/12.2572772

KEYWORDS: Chemical analysis, Statistical analysis, Spectroscopy, Explosives, Biological research, Ionization, Ions, Molecules, Oxygen, Nitrogen dioxide

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Proceedings Article | 17 September 2020 Presentation

Ion mobility spectra of explosives in field asymmetric ion mobility spectrometry method with separating field variation under laser ionization

Gennadii Kotkovskii, Vitaly Kostarev, Artem Akmalov, Alexander Chistyakov

Proceedings Volume 11542, 115420G (2020) https://doi.org/10.1117/12.2573956

KEYWORDS: Ions, Explosives, Ionization, Spectroscopy, Humidity, Nickel, Ion lasers, Laser sources, Molecules, Ultraviolet radiation

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The distinctive features of laser ionization source in field asymmetric ion mobility spectrometry method are studied in this paper. A YAG:Nd 3+ nanosecond laser (λ = 266 nm, τpulse = 6 ns) with variable pulse energy E pulse = 700 – 2500 μJ and frequency ν = 10 – 20 Hz was used as a source of laser radiation. Pentaerythritol tetranitrate (PETN), trinitrotoluene (TNT) cyclotrimethylenetrinitramine (RDX), 1,3,5,7-tetranitro-1,3,5,7-tetrazoctane (HMX), explosives were investigated with use of field asymmetric ion mobility spectrometry (FAIMS) method. Ion spectra were recorded by with separating fields 8 – 12 kV/cm. Nickel radioactive isotope 63Ni was used as reference ionization source for explosive molecules. Non-linear ion mobility spectra of each substance ionized with UV laser radiation and radioactive 63Ni were compared and reasons for similarities and distinctive features are discussed. For peaks of explosives and reactant-ion peaks the dependences of their positions along compensating voltage axis on the magnitude of separating voltage (separating electric field) were measured for all the ion sources and substances. All the experiments were carried out under controlled ambient temperature and relative humidity (t=25℃, RH 30%). Humidity was supported the same inside and outside the gas system to minimize the influence of water cluster formation on the results obtained. Explosives vapors generators were made with 10mg samples of chemically pure explosives. RDX, HMX and PETN were heated (RDX 50℃, HMX 50℃, PETN 45℃) to increase the concentration of ions. It was shown that the behavior of the peaks of the explosives at laser excitation is different from the behavior at radioactive source for each of the substances. This indicates the presence of an additional ionization mechanism under laser radiation along with the traditional one. Spectra of reactant ion peaks under radioactive ionization also show difference in ion formation for each substance. Behavior of reactant-ion peaks of each of the substances with laser ion source shows nearly perfect coincidence. This fact can demonstrate well controlled experimental conditions and further confirms the difference in ionization mechanisms for laser and nickel radioactive ion source.

Proceedings Article | 17 September 2020 Poster + Presentation + Paper

THz imaging with spectral resolution for identification of traces of explosives

A. Akmalov, G. Kotkovskii, K. Kozlovskii, E. Maksimov, A. Plekhanov, A. Chistyakov

Proceedings Volume 11542, 115420O (2020) https://doi.org/10.1117/12.2573795

KEYWORDS: Terahertz radiation, Information visualization, Antennas, Spectral resolution, Visualization, Video, Explosives, Cameras, Terahertz spectroscopy, Terahertz technology, Terahertz detection, Imaging systems, Security technologies

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