In this paper, we developed a quartz oscillator based liquid concentration sensor that analyzes ion species and concentration in a conductive aqueous solution using external magnetic field and frequency dependence. This sensor is composed of the sensing capacitor (SC) and quartz crystal resonator (QCR). The proposed sensor is a contactless capacitive sensor using out-of-plane electric field of a planer sensing capacitor. We succeeded in improving sensitivity using frequency dependence and estimating ion species in aqueous solution by applying an external magnetic field. Because this contactless capacitive sensor is low-priced, we can expect the use for the liquid management of various fields.
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