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A new high-frequency approach to monitoring component concentration in dielectric solutions is proposed. After appropriate calibration, the volume percentage of an n-component solution can be uniquely determined by measuring the real part of the solution permittivity at n-1 distinct frequencies. A flow-through microstrip bandpass filter sensor has been fabricated to demonstrate the accuracy of the technique when applied to a water-ethanol mixture. The sensor can discriminate 0.35% relative variations in ethanol volume concentration when solution temperature is independently monitored.
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McKee et al. (2000) studied this question.
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