Simulation Of Flexible Capacitive Strain Sensor For Food Packaging Applications
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Date
2022-07-25
Authors
Muhammad Safwan, Salleh
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Due to the variety of uses for strain sensors, there is a growing demand for flexible,
affordable, and low-power devices for strain. This paper presents the simulation of the
flexible Interdigitated Capacitive (IDC) strain sensor for food packaging applications.
In the food packaging application, the development of chemical and biosensors
overshadow the capability of the strain sensor in detecting damages in the food
packaging application. Thus, a simple and common flexible capacitive strain sensor is
designed to fulfill this specific requirement. To ascertain its competency in the said
application, the performance of the flexible IDC strain sensor is accessed by using
Ansys Workbench, specifically Ansys Static Structural and Ansys Electric.In the Ansys
Static Structural, the flexible IDC strain sensor performance is simulated for large and
small strain variations from 0GPa to 200GPa to determine its sensitivity. The changing
deformation of the flexible IDC strain sensor is tranferred to Ansys Electric analysis in
order to obtain the nominal capacitance and the changing capacitance of the sensor
model due to the strain experienced of the sensor model. In the Electric analysis, only
a modest voltage of 0.02V is provided to the interdigitated electrodes in the simulation
so that the capacitor can function accordingly. The simulation findings are further
contrasted with actual observations using a developed flexible IDC capacitive strain
sensor that uses Polydimethylsiloxane (PDMS) as the dielectric and substrate and Silver
Nano-Particles (AgNPs) as interdigitated electrodes which has been developed for the
same purpose of this study. The sensor model exhibits a linearity (R2 = 0.9957) which
is a common trend of a common flexible IDC strain sensor. The simulated and
experimental nominal capacitance achieved by the sensor model using Ansys was
0.997pF and 4.37pF respectively. This results in percentage difference between
experimental nominal capacitance and simulated nominal capacitance of 368.78%.
When using the capacitance value from calculation, the nominal capacitance obtained
is 1.010 pF in which results in percentage difference of -3.73%.