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Chemical Sensing with a Magnetically-Excitied Flexural Plate Wave Resonator

Schubert, William K.; Adkins, Douglas R.; Butler, Michael A.; Martin, S.J.; Mitchell, Mary-Anne M.; Kottenstette, Richard K.; Wessendorf, Kurt O.

Chemical sensing with a magnetically excited flexural plate wave (mag- FPW) resonator has been demonstrated for the first time. One surface of the resonator was coated with ethyl cellulose to impart sensitivity to volatile solvents such as chloroform, tetrachloroethylene, trichloroethylene, and toluene. The absorbed mass of the analyte causes a shift in the membrane resonance frequency of the two-port mag-FPW resonator. An oscillator circuit is used to track the resonance frequency, providing a convenient means of monitoring analyte concentration levels. Analyte concentrations of 10 ppm were easily detected.