Title :
Real-time chemical sensing of aqueous ethanol glucose mixtures
Author :
McKee, James M. ; Johnson, Bruce P.
Author_Institution :
Broadcast Technol., Verdi, NV, USA
fDate :
2/1/2000 12:00:00 AM
Abstract :
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
Keywords :
chemical sensors; chemical variables measurement; dielectric liquids; liquid mixtures; microstrip filters; microwave measurement; organic compounds; permittivity measurement; aqueous ethanol glucose mixtures; component concentration monitoring; dielectric solutions; flow-through microstrip bandpass filter sensor; glucose discriminator; high-frequency approach; multiple frequencies; permittivity measurement; real-time chemical sensing; volume percentage; water-ethanol mixture; Calibration; Chemicals; Dielectric measurements; Ethanol; Frequency measurement; Monitoring; Permittivity measurement; Sugar; Temperature sensors; Volume measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
