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Concentration of Sodium Chloride Solutions Sensing by Using a Near-Field Microwave Microprobe  

Kim, Song-Hui (Department of Physics and Interdisciplinary Program of Integrated Biotechnology, Sogang University)
Yoon, Young-Woon (Department of Physics and Interdisciplinary Program of Integrated Biotechnology, Sogang University)
Babajanyan, Arsen (Department of Physics and Interdisciplinary Program of Integrated Biotechnology, Sogang University)
Kim, Jong-Chul (Department of Physics and Interdisciplinary Program of Integrated Biotechnology, Sogang University)
Lee, Kie-Jin (Department of Physics and Interdisciplinary Program of Integrated Biotechnology, Sogang University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.27, no.1, 2007 , pp. 23-30 More about this Journal
Abstract
We observed the NaCl concentration of solutions using a near-field microwave microprobe(NFMM). Instead of the usual technique, we take advantage of the noncontact evaluation capabilities of a NFMM. A NFMM with a high Q dielectric resonator allows observation of small variations of the permittivity due to changes in the NaCl concentration. The changes of NaCl concentration due to a change of permittivity of the NaCl solution were investigated by measuring the microwave reflection coefficient $S_{11}$ of the resonator. The NaCl sensor consisted of a dielectric resonator coupled to a probe tip at an operating frequency of about f=4 GHz. The change of the NaCl concentration is directly related to the change of the reflection coefficient due to a near field electromagnetic interaction between the probe tip and the NaCl solution. In order to determine the probe selectivity, we measured a mixture solution of NaCl and glucose.
Keywords
Near-Field Microwave Microprobe (NFMM); Dielectric Resonator; Tuning Fork Feedback System; Signal to Noise (SNR); Reflection Coefficient ($S_{11}$);
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