0423275 - ÚFP 2014 RIV UA eng C - Konferenční příspěvek (zahraniční konf.)
Ermak, G.P. - Varavin, A.V. - Vasilev, A.S. - Stumbra, M. - Fateev, A.S. - Žáček, František - Zajac, Jaromír - Varavin, Mykyta - Shevchenko, V.
Two-wavelength millimeter wave “unambiguous” heterodyne interferometer.
Proceedings - 2013 International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves, MSMW 2013. Kharkov: IEEE, 2013, s. 528-530. ISBN 978-1-4799-1066-3.
[International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves, MSMW 2013. Kharkov (UA), 23.06.2013-28.06.2013]
Institucionální podpora: RVO:61389021
Klíčová slova: Detectors * Frequency measurement * Phase measurement * Plasma density * Plasma measurements * Tokamaks
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
http://dx.doi.org/10.1109/MSMW.2013.6622129

The paper presents the results of upgrading and description a two wavelength 'unambiguous' microwave interferometer for line integrated electron density measurements at the 'COMPASS' tokamak.The probing signals in the frequency range of 131 and 133 GHz are generated by IMPATT diode oscillators.Double conversion heterodyne receivers are used for detection.Use of each oscillator is twofold:as a source for the probing signals and as a local oscillator for heterodyne detection.The plasma is probed with two separate waves of different wavelengths traveling along identical paths to meet each other.Each probing beam experiences a different phase shift φ1 and φ2 and the 'unambiguous' interferometer determines the difference φ1-φ2.The phase measurement is realized by using the 3 pieces of phase detectors based on pairs of phase/gain evaluation boards (AD8302). Application of the phase detectors provides information on the average plasma concentration in real time and restore the values of
Trvalý link: http://hdl.handle.net/11104/0229342