Abstract
The basic principles of high-resolution terahertz spectroscopy based on the effect of free damping polarization and a spectrometer in which this effect is realized in the mode of phase shift keying of radiation acting on a gas are considered. The presented approach is characterized by high selectivity and sensitivity, short measurement time, and safety. The possibility of using high-resolution terahertz spectroscopy in agricultural applications, such as component analysis of grain composition during its thermal decomposition based on the analysis of grain odor composition, is considered. Measurements of the subterahertz spectra of samples of oats and barley at their thermal decomposition were carried out, and the absorption lines of various organic substances were identified.
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