THZ HIGH RESOLUTION SPECTROMETER CONSTRUCTION AND EXPERIMENTAL VERIFICATION FOR MULTICOMPONENT GAS MIXTURES ANALYSIS
Tretyakov A.K.1, Kistenev Yu.V.1, Nikolaev V.V.1, Raspopin G.K.1;
1Tomsk State University, Tomsk, Russia
Abstract
The THz frequency band contains extremely large amount of strong absorption lines of biogenic and anthropogenic factor atmospheric molecules. The concentration of these molecules in atmosphere plays crucial role in the humanity life, especially in the fields of medicine, agriculture, public security and environmental monitoring. The advantage of the THz frequency band is that THz spectra represent so-called «molecular fingerprints» (rotational, torsional, phonon, intramolecular and intermolecular modes) or in another way a set of narrow spectral lines. The high resolution spectra of the mentioned molecules group make it possible to improve accuracy of multicomponent gas mixture qualitative and quantitative analysis, among other things, with the use of machine learning methods. The aim of this work is to design, construct, and experimentally verify THz high resolution spectrometer, including the set of gas cells with different geometry and optical path, in accordance with the main technical requirements: wide spectral range (7 kHz – 1.1 THz), sensitivity lower than 5∙10-7, and frequency resolution up to 10-3 Hz.
This research was carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation (Agreement No. 075-15-2024-557 dated 04/25/2024).
Speaker
Tretyakov Akim Konstantinovich
Tomsk State University
Russia
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