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Radio Physics and Radio Astronomy

ISSN Print: 2152-274X
ISSN Online: 2152-2758

Archives: Volume 1, 2010 to Volume 3, 2012

Radio Physics and Radio Astronomy

DOI: 10.1615/RadioPhysicsRadioAstronomy.v3.i1.100
pages 75-88

MILLIMETER- AND SUBMILLIMETER-WAVE SPECTROMETERS ON THE BASIS OF DIRECT DIGITAL FREQUENCY SYNTHESIZERS

E. A. Alekseev
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 4, Chervonopraporna St., Kharkiv, 61002, Ukraine
R. A. Motiyenko
Laboratoire de Physique des Lasers, Atomes et Molecules, UMR CNRS 8523, Universite de Lille 1, F-59655 Villeneuve d'Ascq, France
L. Margules
Laboratoire de Physique des Lasers, Atomes et Molecules, UMR CNRS 8523, Universite de Lille 1, F-59655 Villeneuve d'Ascq, France

ABSTRACT

Two new spectrometers based on the direct digital frequency synthesizers are presented. The instruments are characterized by a high rate (up to 100 GHz/hr) of molecular spectrum recording with a high accuracy of measuring transition frequencies (the measurement error for isolated spectral lines lies within ±0.002 MHz provided that the signal-to-noise ratio is 50 or greater). Frequency modulation of the radiation source is provided by direct digital frequency synthesizers that guarantees high stability and determinancy of frequency-modulated signal parameters and makes it possible to minimize the spectral lineshape distortions.