Персона: Кондрашов, Андрей Андреевич
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Структурные подразделения НИЯУ МИФИ, не включенные в состав институтов и факультетов.
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Андрей Андреевич
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- ПубликацияТолько метаданныеExperimental observation of the vibration-rotation radiation curves of (CO2)-C-12-O-16 and (CO2)-C-13-O-16 absorption constants ranging from 4860 to 4880 sm(-1) by the tunable diode laser absorption spectroscopy method(2020) Kireev, S. V.; Kondrashov, A. A.; Dolin, A. A.; Shnyrev, S. L.; Киреев, Сергей Васильевич; Кондрашов, Андрей АндреевичWe report the experimental observation of the absorption constant values of (CO2)-C-12-O-16 and (CO2)-C-13-O-16 using the tunable diode laser absorption spectroscopy method ranging from 4860 to 4880 sm(-1) within the pressure limits of 8-240 mbar for the absorption curves (lines) R(18), R(20), R(22), R(24), R(26), R(28), R(30), R(32), R(34) and R(36) of the 20013-00001 molecule (CO2)-C-12-O-16 vibration band, and within the pressure limits of 0.06-1.7 mbar for the absorption curves P(10), P(12), P(14), P(16), P(18), P(20) and P(22) of the 20012-00001 molecule (CO2)-C-13-O-16 vibration band. In the work, as a mixture under analysis, a mixture of the isotopes (CO2)-C-13-O-16 and (CO2)-C-12-O-16 at the ratio of 1:140 was used. The results have been compared with the data of the HITRAN spectroscopic database.
- ПубликацияТолько метаданныеExperimental measurement of collision broadening of vibrational-rotational spectral lines(12)C(16)O(2)and(13)C(16)O(2)in the 4860-4880 cm(-1)region by diode laser absorption spectroscopy(2020) Kireev, S. V.; Kondrashov, A. A.; Rybakov, M. A.; Shnyrev, S. L.; Киреев, Сергей Васильевич; Кондрашов, Андрей АндреевичThe experimental measurement of the R(18), R(20), R(22), R(24), R(26), R(28), R(30), R(34), R(36) absorption lines collision broadening for the(12)C(16)O(2)molecule vibrational band 20013-00001 and P(10), P(12), P(14), P(16), P(18), P(20), P(22) absorption lines for the(13)C(16)O(2)molecule 20012-00001 vibrational band have been reported in this paper. The research has been first carried out by the diode laser absorption spectroscopy method using a single-frequency diode laser emitting in the 4860-4880 cm(-1)region. The dependences of the absorption constants and cross-sections of these lines on the(13)C(16)O(2)and(12)C(16)O(2)molecules mixture concentrations in the ratio of 1:140 have been studied. The obtained results have been compared with the HITRAN spectroscopic database data.
- ПубликацияТолько метаданныеImproving the (CO2)-C-13 content measurement accuracy in exhaled air using the Kalman technique for filtering the experimental signal obtained by the tunable diode laser absorption spectroscopy method with the frequency modulation of the diode laser pump current(2019) Kireev, S. V.; Kondrashov, A. A.; Shnyrev, S. L.; Киреев, Сергей Васильевич; Кондрашов, Андрей АндреевичThis paper reports on the application of the Kalman method for processing the signal obtained by the tunable diode laser absorption spectroscopy method in an experimental circuit, which includes the frequency modulation of a diode laser pump current in combination with the synchronous detection technique. It has established that the implementing of this approach makes it possible to improve the measurement accuracy of the (CO2)-C-13 content, as well as the measurement accuracy of the (CO2)-C-13 and (CO2)-C-12 concentrations ratio in exhaled air to a level not exceeding 0.1%.
- ПубликацияТолько метаданныеApplication of the Wiener filtering algorithm for processing the signal obtained by the TDLAS method using the synchronous detection technique for the measurement problem of (CO2)-C-13 concentration in exhaled air(2019) Kireev, S. V.; Kondrashov, A. A.; Shnyrev, S. L.; Киреев, Сергей Васильевич; Кондрашов, Андрей АндреевичIt has been shown clearly that using the synchronous detection technique with the pump current frequency modulation of a tunable diode laser emitting near 2 mu m wavelength, combined with the application of the Wiener filtering algorithm for the experimental signal, ensures a two-times improvement in the measurement accuracy for the (CO2)-C-13 content in exhaled air, and, for the (CO2)-C-13 and (CO2)-C-12 concentrations ratio, more than seven times.
- ПубликацияТолько метаданныеApplication of adaptive filters to improve online detection sensitivity of (CO2)-C-13 in a mixture with (CO2)-C-12 in expiratory air(2019) Kireev, S. V.; Kondrashov, A. A.; Shnyrev, S. L.; Киреев, Сергей Васильевич; Кондрашов, Андрей АндреевичThe use of adaptive Kalman and Wiener filters and the empirical mode decomposition algorithm for processing the experimental signal obtained by the tunable diode laser absorption spectroscopy method has been reported to improve the sensitivity of the measurement of (CO2)-C-13 content in human expiratory air. A laser diode, tunable in the range 4860-4880 cm(-1) near the wavelength of 2 mu m, is used as a source. It has shown that the application of these filters ensures a detection sensitivity of (CO2)-C-13 at the level of 10(15) cm(-3), while the minimum detectable fraction of (CO2)-C-13 in a mixture with the (CO2)-C-12 is 3.8.10(-5).
- ПубликацияТолько метаданныеApplication of the least square method for processing the signal obtained by the tuneable diode laser absorption spectroscopy method in the range 4860-4880 cm-1 for the problem of measuring 13CO2 content in exhaled air(2019) Kireev, S. V.; Kondrashov, A. A.; Shnyrev, S. L.; Киреев, Сергей Васильевич; Кондрашов, Андрей Андреевич© 2019 Astro Ltd.The 1st, 2nd and 3rd order least square method (LSM-1, LSM-2 and LSM-3) is applied to smooth the experimental absorption signal of 13CO2 and 12CO2 obtained by the tuneable diode laser absorption spectroscopy method in the 4860-4880 cm-1 frequency range of a tuneable diode laser. It has been shown clearly that using LSM-2 with a filter window N ∼ 100 allows the 13CO2 content in exhaled air to be measured at an error level of 0.28%, which meets breathing tests requirements.
- ПубликацияТолько метаданныеReal-time methods of hydrogen sulfide detection(2022) Kireev, S. V.; Kondrashov, A. A.; Rybakov, M. A.; Shnyrev, S. L.; Sultangulova, A. I.; Киреев, Сергей Васильевич; Кондрашов, Андрей Андреевич© 2022 Astro Ltd.A comparative analytical review of existing methods and means of measuring hydrogen sulfide content in gasses was performed. The method of infrared laser absorption spectroscopy, which uses semiconductor diode lasers tunable in the mid-infrared range as emission sources, is proving to be one of the most promising methods for solving these problems.
- ПубликацияТолько метаданныеThe H2S online detection in gaseous media using diode laser absorption spectroscopy in the range of 4860-4880 cm(-1)(2022) Kireev, S. V.; Kondrashov, A. A.; Rybakov, M. A.; Shnyrev, S. L.; Sultangulova, A. I.; Киреев, Сергей Васильевич; Кондрашов, Андрей АндреевичThis paper reports on experimental measurement of H2S absorption in the spectral range of 4860-4880 cm(-1) by means of diode laser absorption spectroscopy, and determines the H2S spectral absorption line in the generation area of the laser used, most promising in terms of H2S detection using this method.
- ПубликацияТолько метаданныеImplementation of the adaptive Wiener filtering algorithm in the problem of measuring the (CO2)-C-13 content in expiratory air using the tunable diode laser absorption spectroscopy technique(2019) Kireev, S. V.; Kondrashov, A. A.; Shnyrev, S. L.; Киреев, Сергей Васильевич; Кондрашов, Андрей АндреевичThis paper reports on implementing the adaptive Wiener filtering algorithm for the processing of an experimental signal obtained by the tunable diode laser absorption spectroscopy technique near the wavelength of 2 mu m using a tunable diode laser. It has been shown that applying this filter may improve the (CO2)-C-13 content measuring accuracy in a mixture with( 12)CO(2) expiratory air.
- ПубликацияТолько метаданныеApplication of TDLAS for measuring absorption coefficients of H2S rotational absorption lines near the wavelength of 2 µm(2023) Kireev, S. V.; Kondrashov, A. A.; Kusmankulov, B. R.; Shnyrev, S. L.; Suganeev, S. V.; Sultangulova, A. I.; Киреев, Сергей Васильевич; Кондрашов, Андрей Андреевич