A measurement system has been designed with
a micro-vibrating electrode at ultrasonic
frequency to measure local impedance of
biological gel in vitro. The designed system
consists of two electrodes, where one of the
electrodes vibrates with a piezoelectric actuator.
The component of variation at impedance
between two electrodes with vibration of one
electrode is analyzed at the corresponding
spectrum. The manufactured system was
applied to measure impedance of a
physiological saline solution, a potassium
chloride solution, a dextran aqueous solution,
and an egg. The experimental results show that
the designed system is effective to measure
local mechatronic property of biological gel.