Персона: Кондрашов, Андрей Андреевич
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Experimental 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
The 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.
Application of adaptive filters to improve online detection sensitivity of (CO2)-C-13 in a mixture with (CO2)-C-12 in expiratory air
The 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).
The H2S online detection in gaseous media using diode laser absorption spectroscopy in the range of 4860-4880 cm(-1)
This 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.
Application of TDLAS for measuring absorption coefficients of H2S rotational absorption lines near the wavelength of 2 µm
Improving 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
This 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%.
Application 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 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.
Implementation 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
This 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.
Application 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
It 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.
Real-time methods of hydrogen sulfide detection
© 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.