Elsevier

Procedia Engineering

Volume 87, 2014, Pages 1581-1584
Procedia Engineering

Optimal Parameter Estimation Method for Different Types of Resonant Liquid Sensors

https://doi.org/10.1016/j.proeng.2014.11.536Get rights and content
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Abstract

The performance of a recently introduced method to estimate the resonance parameters from complex spectral data and the error propagation for viscosity and density parameters of liquids are examined. The method is known to produce excellent results when used for piezoelectric and Lorentz force actuated sensors for single port or two-port devices. The method is also suited for very low quality factors (< 10) which extends the usable measurement range of many sensor concepts, especially for fluid sensing applications. Generally valid expressions for the measurement accuracy are stated and compared to measurement results obtained with a piezoelectric tuning fork and a Lorentz force actuated and inductively read out platelet sensor.

Keywords

viscosity sensor
lumped element circuit
Cramer-Rao lower bound
accuracy
fluid loading

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Peer-review under responsibility of the scientific committee of Eurosensors 2014.