Title :
Compact RF Impedance-Spectrum-Analyzer For Lateral Field Excited Liquid Acoustic Wave Sensors
Author :
Schneider, T. ; Hempel, Ulrike ; Doerner, S. ; Hauptmann, P.R. ; McCann, D. ; Vetelino, J.F.
Author_Institution :
Univ. of Magdeburg, Magdeburg
Abstract :
A compact RF impedance-spectrum-analyzer (RF-ISA) has been developed and applied to a Lateral Field Excited (LFE) liquid acoustic wave sensor, which is sensitive to both, the mechanical and the electrical liquid property changes. The developed RF-ISA was used to determine the impedance spectrum of a LFE sensor exposed to various liquids with varying electrical and mechanical properties and to calculate the series resonance frequency and resistance at the sensor´s conductance maximum. The combination of the LFE sensor and the RF-ISA electronics results in a compact and portable liquid sensing unit, which not only has many sensing applications but also can provide insight into the piezoelectric excitation and transduction mechanisms.
Keywords :
acoustic waves; flow sensors; piezoelectric transducers; spectral analysers; LFE sensor; RF impedance-spectrum-analyzer; electrical liquid property; lateral field excited liquid acoustic wave sensors; liquid sensing unit; mechanical liquid property; piezoelectric excitation; series resonance frequency; transduction mechanisms; Acoustic sensors; Acoustic waves; Electric resistance; Impedance; Liquids; Mechanical factors; Mechanical sensors; Radio frequency; Resonance; Resonant frequency;
Conference_Titel :
Sensors, 2007 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-1261-7
Electronic_ISBN :
1930-0395
DOI :
10.1109/ICSENS.2007.4388391
