Electrical and Computer Engineering
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Browsing Electrical and Computer Engineering by Subject "Additive manufacturing"
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Item Open Access Manufacturing Strain Sensor Via Printed Electronics Onto 3D Printed Substrates(2023-12-08) Badrian, Babak; Grau, GerdInkjet printing is a promising technology with advantages such as digital customization, reduced cost and fabrication time, and non-contact printing. These features enable inkjet printing to fabricate on novel, diverse substrates such as 3D printed substrates. 3D printing technology builds 3D structures with freedom of design, mass customization, low cost, and ability to fabricate complex geometries. In this thesis, we aim to integrate inkjet printing with 3D printing technology and fabricate a strain gauge sensor. We use various additive manufacturing (AM) techniques including 3D fused filament fabrication (FFF) printing, extrusion printing, and inkjet printing. We used silver nanoparticle ink and studied different conditions to maximize electrical conductivity of the ink. This optimization includes ultraviolet (UV) time exposure, drop spacing, heating conditions, intense pulsed light parameters, and length shrinkage. A low-cost strain gauge sensor is fabricated onto 3D printed PLA material. The related mechanical/electrical tests are performed for the sensor characterization.Item Open Access Printed Tattoo Electrodes for Electrophysiological Signal Acquisition(2023-12-08) El-Hajj, Yoland Jamal; Grau, GerdThe enhancement of medical tattoo electrodes over the past few decades have enabled them to serve as an alternative to conventional Ag/AgCl electrodes. Additive manufacturing methods can enable efficient and flexible fabrication of the tattoo electrodes, in contrast to the traditional fabrication methods demonstrated thus far. The objective of this project is to optimize printing methods to fabricate medical tattoo electrodes, as well as analyze and compare their performance both in vitro and in vivo to Ag/AgCl electrodes. Inkjet and extrusion printing methods were optimized to print various electrode patterns on a tattoo paper substrate and a simple contact platform was developed to allow for external connections to rigid components. Initial testing and analysis of the electrical and mechanical performance of the electrodes outside the human body was subsequently performed. The electrodes were ultimately tested on human subjects to acquire ECG and EMG signals, which were analyzed in terms of signal quality.