University Department and/or Lab
Laboratory for Surface Science and Technology
Develop a theoretical describing the behavior of an LFE sensor in response to
mechanical (viscosity), and electrical (conductivity, permittivity) property
changes of a solution
The proposed focus of study is to develop a model for the LFE sensor for gas-
and liquid-phase sensing applications. Specifically, a general equivalent circuit
model will be developed so that the behavior of the LFE sensor to mechanical
and electrical property changes of the analyte can be predicted. This model will
start with the transmission line model developed by Ballato, et al. for LFE filters.
The general equivalent circuit will be modified for liquid-phase sensing applications.
The modified equivalent circuit will be developed for both Maxwellian and Newtonian
fluids. The equivalent circuit models will be developed using MATLAB. The analysis
software will be developed so that it may be applied to a chosen orientation
of a given piezoelectric material with known elastic, piezoelectric, and permittivity
The model will be verified by exposing LFE sensors to a variety of fluids with
known mechanical and electrical properties. The results of the experiments will
be compared to those predicted by the model and any necessary modifications to
the model will be made.
Example of how my research
is integrated into my GK-12 experience
One activity that I used in High School Physics classes was to build a falling-ball
viscometer using a metal sphere and 1 liter graduated cylinder and measure the
viscosity of water, vegetable oil, and motor oil. The students measured the mass
and diameter of the sphere, and the time it took for the sphere to fall through
the liquid between two predetermined points. It was assumed that the sphere between
the two points was at terminal velocity. This relates to my research in that
I verify the viscosity of liquids that I use in LFE experiments with a Brookfield
capillary viscometer. The students were surprised that such a basic setup yielded
a viscosity for water that was within 5% of 1 cP, the approximate value at standard
temperature and pressure.
Profile date: March 2007