Improvement of the performance of a capacitive relative pressure sensor: case of large deflections
2020
Abstract. Capacitive pressure sensors are widely used in a variety of
applications and are built using a variety of processes, including 3D
printing technology. The use of this technology could lead us to a situation
of large deflections, depending on the mechanical properties of the
materials and the resolution of the machines used. This aspect is rarely reported
in previous research works that focus on improving the performance in
terms of linearity and sensitivity of these sensors. This paper describes
the realization of relative pressure sensors designed as two different
structures; the first one is the classical design composed of a single
capacitor, while the second one is composed of two capacitors, designed in
such a way that they both vary according to the applied pressure but in
opposite senses to each other. The purpose is to study in particular the
performance of the second structure in the case of large deflections for
the context of educational use. Polylactic acid (PLA) is used as the manufacturing material to print the
sensors by means of a printer based on fused deposing modeling, while
conductive materials are used to provide the electrical conductivity
required for the printed sensors. The manufactured sensors were tested under
pressure in the range of [0; 9] KPa. Compared to the performance obtained
with the first structure, simulation and experimental results show that the
second structure improves linearity and allows the sensitivity to be increased from a minimum of 9.98 × 10 - 2 pF/hPa to a minimum of 3.4 × 10 - 1 pF/hPa.
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