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R. Schnitzer, M. Gröschl, E. Benes:
"A microprocessor controlled multi-channel measurement system for resonant piezoelectric BAW sensors";
in: "Proc. 1st Congress of Alps Adria Acoustics Association / 3rd Congress of Slovenian Acoustical Society", M. Cudina (Hrg.); Slovenian Acoustical Society, Portoroz/Slowenien, 2003, ISBN: 961-6238-73-6, S. 549 - 554.

A new microprocessor controlled multi-channel measurement system for resonant
piezoelectric bulk acoustic wave (BAW) sensors measuring different physical quantities,
like temperature, viscosity and humidity, is presented. The measurement principle for all
supported sensors is based on the determination of the sensor's electrical admittance as a
function of frequency in the vicinity of resonant frequencies. The physical measurand
quantity is calculated out of one or two resonant frequencies and in some cases the quality
factor of the sensor by using the appropriate sensor function for each type of sensor.
Special demands on the electronics for resonant sensors are described. Kernel
measurement electronics are used to transform the admittance values of the sensor to
voltage signals which can be acquired by the computer. Two different types of such kernel
electronics are compared with respect to their principal capabilities for resonant sensor
applications. The multi-channel measurement system is controlled by an industrial PC (NI
PXI). Basic features of the sensor family and the measurement electronics are discussed.

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