Journal
REVISTA FACULTAD DE INGENIERIA-UNIVERSIDAD DE ANTIOQUIA
Volume -, Issue 82, Pages 47-52Publisher
IMPRENTA UNIV ANTIOQUIA
DOI: 10.17533/udea.redin.n82a06
Keywords
Piezoresistive effect; contact pressure measurements; repeatability; sensor hysteresis; time drift test
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Funding
- Sistema General de Regalias, Republic of Colombia through the project Fortalecimiento de la plataforma tecnologica para la formacion especializada en el area de la salud y el desarrollo de tecnologia biomedica [RutaN-139C]
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The use of contact pressure sensors has become popular in various engineering disciplines in recent years. They are used in characterization of vehicle tires, bearings, wind tunnels, prosthesis design, ergonomic analysis among other areas. These sensors are fabricated with materials that have certain properties such as piezoelectricity, piezoresistance and variable capacitance; however, the most used characteristic is the piezoresistive effect. This paper describes the fabrication of three different sensors using piezoresistive materials. Furthermore, a comparative technical study including a commercial sensor as a benchmark is done with the aim of selecting a suitable material when measuring contact pressure. The repeatability and hysteresis of each sensor were evaluated in a response to load test realized several times. A time drift test with a dead load was also performed for evaluating stability. Materials such as piezoresistive fabric or ink show to be suitable for applications where deformation and flexible sensors are required, Velostat is the least accurate but suitable for basic applications and in which a high resolution is not needed. Finally, some recommendations are given regarding the type of material to be used in pressure sensors for engineering applications, particularly in the biomedical field.
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