Abstract
In this study, we propose a multi-walled carbon nanotube epoxy composite sensor for force and pressure sensing in the range of 50 N–2 kN. A manufacturing procedure, including material preparation and deposition techniques, is proposed. The electrode dimensions and the layer thickness were optimized by the finite element method. Temperature compensation is realized by four nanocomposites elements, where only two elements are exposed to the measurand. In order to investigate the influence of the filler contents, samples with different compositions were prepared and investigated. Additionally, the specimens are characterized by cyclical and stepped force/pressure loads or at defined temperatures. The results show that the choice of the filler content should meet a compromise between sensitivity, temperature influence and noise behavior. At constant temperature, a force of at least 50 N can be resolved. The measurement error due to the temperature influence is 150 N in a temperature range of −20°C−50°C.
Highlights
The measurement of mechanical quantities, such as force, torque or pressure, is a challenging task in science and engineering
The viscosity of the multi-walled carbon nanotubes (MWCNTs)-epoxy composite is measured
In order to investigate the influence of the filler content, the sensitivity and the signal-to-noise ratio from different MWCNT
Summary
The measurement of mechanical quantities, such as force, torque or pressure, is a challenging task in science and engineering. The applicable pressure is low (0–0.2 MPa) [24] for elastomer This measurement range is interesting, for example, on the human periphery [25]. Mohiuddin et al dispersed multi-walled carbon nanotubes (MWCNTs) in polyether ether ketone In this investigation, the temperature dependence from 20 ◦ C up to 140 ◦ C and the pressure dependence up to 40 MPa were studied [28]. Thereby, the high sensitivity is important, the sensitivity to temperature influence and the signal-to-noise ratio are further important criteria For these reasons, another focus of this work is the comparison between the pressure sensitivity, the temperature influence and the signal noise of the MWCNT-epoxy composite by varied filler contents. We investigate the efficiency of the temperature compensation with a Wheatstone bridge
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