Open AccessSelective scheme of gas concentration measurement based on acousto-optic spectral filters with multi-frequency control signal
Author(s) -
Yu. V. Pisarevsky,
С. А. Колесников,
V. A. Lomonov,
А. В. Виноградов
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1421/1/012069
Subject(s) - absorption (acoustics) , materials science , anisotropy , dispersion (optics) , optics , absorption spectroscopy , signal (programming language) , filter (signal processing) , spectral resolution , ultrasound , acoustics , analytical chemistry (journal) , chemistry , spectral line , computer science , physics , astronomy , computer vision , programming language , chromatography
A scheme for measuring the concentration of components of gas mixtures improving the selectivity of conventional optical absorption spectroscopy is proposed. The scheme is based on the use of acousto-optic spectral filter as a dispersion element which is fed simultaneously several control signals with frequencies corresponding to the maxima and minima of absorption in the optical spectrum of the measured gas. The scheme is implemented on the basis of the acousto-optic filter based on paratellurite TeO 2 crystal, providing the high resolution achieved by reducing the absorption of ultrasound due to the special technology of the growth of high quality crystals and the use of absorption anisotropy of ultrasound in paratellurite. Experimental verification of this approach with measuring the concentration of nitrogen dioxide has confirmed the effectiveness of the proposed scheme.