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Article Dans Une Revue IEEE Transactions on Terahertz Science and Technology Année : 2022

Broadband super-resolution Terahertz Time domain spectroscopy applied to Gas analysis

Résumé

Commercially available Terahertz (THz) Time domain spectroscopy (THz-TDS) apparatus are used in multiple application fields from material science to biology, and even in industry to measure the thickness of a paint layers. Its broad spectral coverage is of interest for air quality monitoring and atmospheric composition analysis. However, gas spectroscopy needs high resolution that the usual approach in THz-TDS is unable to provide. In this letter, we introduce the concept of constraint reconstruction for super-resolution spectroscopy based on the modeling of the spectroscopic rotational lines in a sparse spectrum. It is demonstrated for low-molecular weight molecules in gas phase that typically have spectra containing a small number of narrow lines over a broad spectrum. This alternative approach directly reconstructing the spectra achieved a resolution improvement factor of 10 compared to the best available resolution by the standard THz-TDS data treatment.
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Dates et versions

hal-03143451 , version 1 (16-02-2021)
hal-03143451 , version 2 (08-03-2021)
hal-03143451 , version 3 (11-10-2021)

Identifiants

Citer

Sophie Eliet, Arnaud Cuisset, Francis Hindle, Jean-Francois Lampin, Romain Peretti. Broadband super-resolution Terahertz Time domain spectroscopy applied to Gas analysis. IEEE Transactions on Terahertz Science and Technology, 2022, 12 (1), pp.75-80. ⟨10.1109/TTHZ.2021.3120029⟩. ⟨hal-03143451v3⟩
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