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ISSN 2415-3400 (Online)
ISSN 1028-821X (Print)

THE MEASUREMENT CELL BASED ON THE QUARTZ QUAZIOPTICAL RESONATOR FOR RESEARCH ON DIELECTRIC LIQUIDS IN THE SUB-THZ RANGE

heading: 
MICROWAVE AND TERAHERTZ TECHNOLOGY
Barannik, AA, Vitusevich, SA, Gubin, АI, Protsenko, IA, Cherpak, NT
Organization: 

O. Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine
12, Proskura st., Kharkov, 61085, Ukraine
E-mail: i.o.protsenko@gmail.com

Peter Grünberg Institute Forschungszentrum Jülich, Germany
https://doi.org/10.15407/rej2016.02.074
Language: Russian
Abstract: 

Using WGM resonators allow achieving high accuracy in determining the substances permittivities due to the high Q-factor. The resonator with a microfluidic channel is promising for the study of small-volume liquids, which is especially important for bioliquids. In a Ka-band a sapphire resonator with microfluidic channel has been proposed as a measurement cell, but in the sub-THz range a quartz resonator has more suitable characteristics due to its high Q-factor. In the paper we propose a measurement cell for the determination of complex permittivity of liquids in sub-THz range on the basis of quasi-optical quartz resonator with a layer of plastic comprising a microfluidic channel. Experimental studies of the resonator structure are carried out and a model for numerical research in the software COMSOL Multiphysics is proposed. By means of c omparing the resonator frequencies and Q-factors values with the corresponding values obtained with the numerical model the correction of the model has been carried out for the water-filled microfluidic channel. It is shown that the model for numerical studies correctly describes the resonator structure. The values of the resonator frequency and Q-factor obtained experimentally and numerically, for the microfluidic channel filled with the substances with well-known complex permittivity (methanol, propanol, ethanol, acetone), are in good agreement, which indicates the possibility of using the resonator as a measurement cell allowing the research on small-liquid permittivity using the special calibration procedure.
Keywords: quartz quasioptical resonator; microfluidic channel; permittivity; bioliquids

Manuscript submitted 27.04.2016
PACS 77.22.Ch; 87.85.Fk
Radiofiz. elektron. 2016, 21(2): 74-78
Full text (PDF)

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