Title :
Accurate double transmission measurement concepts for the permittivity determination in pneumatic conveying tubes with microwaves
Author :
Baer, Christoph ; Gerding, Michael ; Pohl, Nils ; Vogt, Mirko ; Musch, Thomas
Author_Institution :
Inst. for Electron. Circuits, Ruhr-Univ. Bochum, Bochum, Germany
Abstract :
In this contribution, two measurement concepts for the determination of volume fractions in multi phase flows are presented. Essential requirements for the proper functionality of double transmission measurement concepts, such as the feed side reflection suppression, are presented. The first measuring method uses a two state modulator which allows a high accurate feed side reflection suppression. The second measuring method makes use of a transpolarizing reflector which improves measuring speed and decreases setup complexity. In order to verify the introduced measuring methods, various electromagnetic field simulations and measurements on a borosilicate glass tube are presented and discussed in detail.
Keywords :
conveyors; microwave measurement; multiphase flow; permittivity measurement; pipes; pneumatic systems; borosilicate glass tube; double transmission measurement concepts; electromagnetic field simulations; feed side reflection suppression; microwave measurement; modulator; multiphase flow; permittivity determination; pneumatic conveying tubes; transpolarizing reflectors; volume fractions; Electron tubes; Feeds; Microwave measurements; Microwave theory and techniques; Modulation; Permittivity; Permittivity measurement; Double transmission measurement; FMCW RADAR; permittivity composition;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2011 Asia-Pacific
Conference_Location :
Melbourne, VIC
Print_ISBN :
978-1-4577-2034-5
