Design And Fabrication Of Flexible Strain Sensor For Food Packaging
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Date
2022-07-24
Authors
Abdul Aziz, Siti Nuha Majiddah
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The work in this thesis was focused in developing a flexible strain sensor
capable of detecting strain within the low working range for the use in food packaging.
For this cause, capacitive pressure sensors was designed, fabricated and characterised,
utilising conductive and non-conductive polymeric elements to sense loads. An
interdigital capacitive strain sensor was developed, which successfully provided a high
reading. The sensor employ polydimethylsiloxane (PDMS) layers which act as the
substrate and dielectric layer that sandwich the electrode layer. To fabricate these
PDMS layers, a drop casting process was done involving a 3D printed mould in order
to create a rectangular shaped PDMS. The electrode was also drop casted on the pattern
that was on top of the substrate and subsequently dielectric layer was added. The
fabricated flexible strain sensor shows initial capacitance as high as 4.98 pF. The
presented capacitive strain sensor offers a reasonable capacitance; therefore; it can be
utilised in the food packaging as well as other application that also need a measurement
of strain. This design of strain sensor is chosen as its ease of design.