2023, Chistyakov, A. A., Akmalov, A. E., Kotkovskii, G. E., Kozlovskii, K. I., Maksimov, E. M., Martynov, I. L., Osipov, E. V., Kuzishchin, Yu. A., Plekhanov, A. A., Осипов, Евгений Валерьевич, Козловский, Константин Иванович, Котковский, Геннадий Евгеньевич, Мартынов, Игорь Леонидович, Максимов, Евгений Михайлович, Чистяков, Александр Александрович, Акмалов, Артём Эдуардович

An analysis of the current state of research and development in the fi eld of radiovision for the terahertz range of electromagnetic radiation was carried out in the work. Various sources of terahertz radiation are considered: photoconductive antennas, IMPATT diodes, Schottky diodes, and others, as well as modern video cameras for this range and their main characteristics for recording and studying THz images in various spectral regions. The results of studies of the intensity distribution in THz radiation beams at diff erent wavelengths for photoconductive antennas using THz radiovision, as well as the possibilities of studying scattering processes during refl ection and transmission of THz radiation for various materials, are presented.

2022, Akmalov, A. E., Kotkovskii, G. E., Kozlovskii, K. I., Maximov, E. V., Martynov, I. L., Osipov, E. V., Plekhanov, A. A., Kuzishchin, Yu. A., Chistyakov, A. A., Акмалов, Артём Эдуардович, Котковский, Геннадий Евгеньевич, Козловский, Константин Иванович, Максимов, Евгений Михайлович, Мартынов, Игорь Леонидович, Осипов, Евгений Валерьевич, Плеханов, Андрей Александрович, Кузищин, Юрий Александрович, Чистяков, Александр Александрович

2019, Akmalov, A. E., Aksenov, E. A., Kotkovskii, G. E., Kozlovskii, K. I., Maksimov, E. M., Plekhanov, A. A., Chistyakov, A. A., Акмалов, Артём Эдуардович, Котковский, Геннадий Евгеньевич, Козловский, Константин Иванович, Максимов, Евгений Михайлович, Плеханов, Андрей Александрович, Чистяков, Александр Александрович

© 2019 SPIE.The work is devoted to the influence of scattering of terahertz (THz) radiation by hexogen particles (RDX) in powdery samples on their transmission and reflection spectra. A terahertz radio-vision installation with spectral resolution was used to determine experimentally THz spectra of RDX. For samples with small RDX particles (the typical particle size is 100 μm), characteristic peaks at 0.8 THz and 1.06 THz are observed in absorption spectra despite scattering, that can be used to identify this substance. For large hexogen particles (a typical particle size is 450 μm), experiments and numerical simulation showed that even the most intense peak at 0.8 THz is not observed in absorption spectra, and the spectra are mainly due to the scattering effect and its depending on the wavelength of radiation. The reflection spectra of RDX layers (particle size is about 100 μm) qualitatively differ from the reflection spectra of RDX crystals and are formed as a result of absorption during propagation of THz radiation in the particle layer. Thus, the substance can be identified by absorption spectra in a reflection scheme.

2024, Plekhanov, A. A., Akmalov, A. E., Kotkovskii, G. E., Kuzishchin, Y. A., Martynov, I. L., Osipov, E. V., Chistyakov, A. A., Плеханов, Андрей Александрович, Акмалов, Артём Эдуардович, Котковский, Геннадий Евгеньевич, Кузищин, Юрий Александрович, Мартынов, Игорь Леонидович, Осипов, Евгений Валерьевич, Чистяков, Александр Александрович

2021, Tkachuk, A. P., Verdiev, B. I., Alatirev, A. G., Akmalov, A. E., Chistyakov, A. A., Kotkovskii, G. E., Kuzishchin, Y. A., Martynov, I. L., Osipov, E. V., Pashkevich, A. A., Акмалов, Артём Эдуардович, Чистяков, Александр Александрович, Котковский, Геннадий Евгеньевич, Кузищин, Юрий Александрович, Мартынов, Игорь Леонидович, Осипов, Евгений Валерьевич, Пашкевич, Александра Андреевна

© 2021 SPIECurrently, one of the most important application of flow cytometry is the real-time analysis of aerosols, in particular, to ensure biosafety. In most cases, such analysis is aimed at detecting fluorescent signals from aerosol particles corresponding to the light emission of tryptophan and nicotinamide adenine dinucleotide (NADH). Further development of the method is largely related to the improvement of the light detecting systems for recording and processing of fluorescence and scattered light signals. In this work, a comparative analysis of flow cytometers for bioaerosols detection based on photo-multiplier tubes (PMT) and avalanche photodiodes (APD) operating in analog and photon-counting modes was carried out. The limit of detection (LOD) of bioaerosols, response time and ability to detect particles with low scattering and fluorescence cross section were calculated and examined. The calculations were carried out for the well-known optical scheme of fluorescence detection based on discrete photodetectors and dichroic mirrors combined with an air flow chamber equipped with elliptical and spherical mirrors. An ultraviolet light emission diode (LED) was used as a model source of exciting radiation. To estimate the optical properties of aerosol particles, experimental results obtained for a model bovine serum albumin bioaerosol and published data on various other bioaerosols were used. The calculation of the total number of fluorescent photons, emitted by particles of various sizes while passing the flow chamber was carried out. The obtained data were compared with parameters of photodetectors operating in analog and photon-counting modes. The critical particle size was determined for the effective registration in a photon-counting mode. Considering the size distribution of aerosol particles, it was concluded that application of the photon-counting mode will reduce the LOD of bioaerosols by more than an order of magnitude.

2021, Котковский, Г. Е., Чистяков, А. А., Мартынов, И. Л., Кузищин, Ю. А., Акмалов, А. Э., Осипов, Е. В., Акмалов, Артём Эдуардович, Кузищин, Юрий Александрович, Чистяков, Александр Александрович, Котковский, Геннадий Евгеньевич, Мартынов, Игорь Леонидович, Осипов, Евгений Валерьевич

Изобретение относится к области измерительной техники и касается оптической системы для определения составов аэрозолей на основе люминесцентного анализа аэрозольных частиц. Оптическая система содержит по крайней мере один источник возбуждающего излучения с фокусирующим средством, подсистему передачи оптических сигналов от потока аэрозольных частиц, подсистему спектрального разделения и приемники рассеянного и люминесцентного излучения. В качестве источников возбуждающего излучения используют светодиоды. Фокусирующее средство состоит из собирающей линзы, направляющего зеркала и асферической линзы. Подсистема передачи оптических сигналов содержит эллиптическое и сферическое зеркала, оптический возвратный элемент, диафрагму и коллимирующую линзу. Подсистема спектрального разделения содержит светоделительные зеркала, отсекающий светофильтр, установленный после первого светоделительного зеркала, и нейтральный светофильтр, установленный перед приемником рассеянного излучения. Технический результат заключается в повышении эффективности сбора излучения и информативности оптического сигнала, упрощении конструкции оптической системы и требований по ее обслуживанию. 11 з.п. ф-лы, 3 ил.

2020, Akmalov, A. E., Chistyakov, A. A., Kotkovskii, G. E., Kostarev, V. A., Kulintsov, A. V., Lavrinenko, K. N., Акмалов, Артём Эдуардович, Чистяков, Александр Александрович, Котковский, Геннадий Евгеньевич, Костарев, Виталий Алексеевич, Лавриненко, Кирилл Николаевич

© 2020 SPIECyclotrhylmethylentrinitramine (RDX) is one of the most dangerous explosive substances. The presence of impurities in this explosive may be important for its determination as residual traces at the scene of incidents, as well as in the quick analysis of passengers and luggage by ion mobility spectrometers. In the work industrially manufactured RDX samples, that were not undergone any purification, were investigated by gas chromatography-mass spectrometry method. The attention was paid to search precursors and possible technological admixtures. On the basis of received chromatograms and mass spectra it was established the presence in the analyzed RDX samples of urotropin, acetic anhydride, acetic acid, triazine and octogen. The mass content of the substances was estimated. Special attention was paid to the products of RDX biodegradation, which can occur both in aerobic and anaerobic environments during its storage. The quantitative content of RDX biodegradation products in samples under study was estimated. Sorption of chemically pure and industrially manufactured RDX vapors on a concentrator from metal meshes were carried out. By the method of thermodesorption mass spectrometry the composition and differences of the concentrated samples were analyzed. Recommendations for taking into account the results obtained when working with vapors and traces of RDX by ion mobility spectrometers were given.

2022, Akmalov, A. E., Chistyakov, A. A., Kotkovskii, G. E., Kostarev, V. A., Акмалов, Артём Эдуардович, Чистяков, Александр Александрович, Котковский, Геннадий Евгеньевич, Костарев, Виталий Алексеевич

2021, Akmalov, A. E., Belenok, S. K., Kostarev, V. A., Kotkovskii, G. E., Chistyakov, A. A., Акмалов, Артём Эдуардович, Беленок, Сергей Константинович, Костарев, Виталий Алексеевич, Котковский, Геннадий Евгеньевич, Чистяков, Александр Александрович

© 2021 SPIEAerosol samplers with a recirculating liquid film are promising devices for remote biological monitoring. The presence of the liquid film provides a high survival rate for biological objects. The relatively simpler design allows portability to the sampler, which will make it possible to conduct tests outside the laboratory. In this study an analytical expression, describing the capturing efficiency of aerosol particles in the water film, taking into account the friction forces arising from interaction of water and air in a cyclone-based aerosol collector, was obtained. A new element, took over from the theory of centrifugal sprayers - a vortex chamber, was added to the theory and design of the collector. It allows increasing the initial angular moment of the elements of air volume entering the collector, which leads in appropriately an increase of maximal height of rising liquid film and particle capturing efficiency. To analyze the obtained expressions, graphs of particle capturing efficiency on basic parameters of modified cyclone collector and volumetric air flow were calculated. The graphs made it possible to determine the optimal geometric parameters for the portable cyclone-based collector. The introduced dependence on viscosity made it possible to estimate more accurately the efficiency of the device at various temperatures (including negative temperatures). For the selected parameters, graphs particle capturing efficiency were plotted. Water-alcohol solution and Novec 1230 fluid were used as fluids capable of operating at subzero temperatures. To check the operability of the sampler, tests were carried out to collect samples of sprayed inactivated adenovirus in a microbiological safety box at the Gamaleya Institute. The results of tests are discussed.

2023, Plekhanov, A. A., Akmalov, A. E., Kotkovskii, G. E., Kozlovskii, K. I., Kuzishchin, Y. A., Martynov, I. L., Maximov, E. M., Osipov, E. V., Chistyakov, A. A., Плеханов, Андрей Александрович, Акмалов, Артём Эдуардович, Котковский, Геннадий Евгеньевич, Козловский, Константин Иванович, Кузищин, Юрий Александрович, Мартынов, Игорь Леонидович, Максимов, Евгений Михайлович, Осипов, Евгений Валерьевич, Чистяков, Александр Александрович