IDEA #8A0FRV Innovative Millimeter Wavelenth Dielectrometer For Determination Of Wine And Fruit Juice Autheticity

APPLIED RESEARCH • SENSORSINNOVATIVE MILLIMETER WAVELENTH DIELECTROMETER FOR DETERMINATION OOFF WINES AND FRUIT JUICES AUTHETICITY Description The wine trade is a multi(cid:2)million(cid:2)income industry seriously suf(cid:2) fering from fraud. The development of methods for counterfeit wine identification is pressing problem. We propose to devel(cid:2) op an automated testing system for examination of vines and fruit juices authenticity. The essence of the idea lies in an indi(cid:2) rect determination of viscosity of wines and fruit juices via measurement of liquids’ complex permittivity (CP) using auto(cid:2) mated millimeter wavelengths dielectrometer. The CP of wines and fruit juices depends on the properties of their main com(cid:2) ponent (cid:2) water. The base of our dielectrometer is a semi(cid:2)ball resonator with a monitoring liquid outside placed into a cop(cid:2) per cavity. The cavity with the resonator is placed into a ther(cid:2) mostat to keep stable temperature. Low error of frequency measurement (?10(cid:2)8) provides by a Ка –synthesizer with pre(cid:2) cision quartz frequency standard (Fig.2). The frequency step is ? 1 kHz. The frequency tuning is provided by frequency code from a controller. After measurement loop termination the data (resonant frequency and quality factor of resonator oscil(cid:2) lations) are transferred to computer for further processing using specialized software and CP determination. The total CP measurement accuracy is approximately 1 (cid:2) 2%. This system is under development in collaboration with National Institute of Vine and Wines “Magarach” (Ukraine). The proposed dielec(cid:2) trometer can be easily incorporated into technological process stream of wine production. Innovative Aspect and Main Advantages We suggest using the CP as an integral quantity to solve the task of fast monitoring of drinks composition and authenticity testing. The classical analytical methods are generally time(cid:2) consuming and/or expensive and not suitable for continuous monitoring. The indirect determination of viscosity of wine and fruit juices via CP measurement is most suitable at millimeter wavelengths where frequency dispersion of water is most strong. The main feature of our measurement cell is a high symmetry resonator where a monitoring liquid does not break its symmetry but induces changes in resonant frequency and quality factor. The high symmetry of the resonator filled with the monitored liquid allows getting the rigorous solution of the complex characteristic equations for the eigenfrequencies in the resonator. Earlier we developed the theory of this tech(cid:2) nique and confirmed it experimentally (Fig. 1). A measurement cell with a quasi(cid:2)optical resonator of high space symmetry is used as a main measuring element (Fig.1a). We obtain the real and imaginary parts of CP (Fig.1b) using the measured reso(cid:2) nance frequency and quality factor of the oscillations in the resonator. Areas ooff Application The CP measurement can be used by testing laboratories of Ukraine and other countries for quality assessment of the wines and juices as an express inspection certification low – cost system. For example, the dielectrometer designed during the project fulfillment will be delivered to National Institute of Vine and Wines “Magarach” for testing under practice condi(cid:2) tions. 54 a) b) Fig.1. (а). The measurement cell (cid:2) the layered semi(cid:2)ball dielec(cid:2) tric resonator with the outer monitored liquid. 1 is the moni(cid:2) tored high loss liquid; 2, 3 are input and output waveguides; 4, 5 are exiting and receiving dipole antennas; 9 is the dielectric layer; 10 is the sapphire hemi(cid:2)ball. (b) The dependence of real (the red line) and imaginary (the black line) parts of the CP of water(cid:2)alcohol solution on its concentration that was obtained by our measurement cell. (Z.E.Eremenko, E.M.Ganapolskii at al // Measurement Science and Technology (UK), V. 16 (2005) 1619(cid:2)1627). Fig.2 The dielectrometer block diagram. Stage ooff Development The CP measurement of high loss liquids at millimeter wave band and dielectrometers which can be used to the authentic(cid:2) ity of grape wines and juices now have conceptual stage and partially development phase – laboratory tested. Contact Details Contact person: Zoya Eremenko Institute for Radiophysics and Electronics named after A. Usikov, National Academy of Sciences of Ukraine 12 Akademika Proskura Str. 61085, Kharkov, Ukraine. Tel: (380(cid:2)57)(cid:2)7203(cid:2)553; Fax: (380(cid:2)57)(cid:2)3152(cid:2)105 Mob.: 38(097) 527(cid:2)60(cid:2)10 E(cid:2)mail: zoya@ic.kharkov.ua Web(cid:2)site: http://www.ire.kharkov.ua/