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Design, fabrication, and implementation of a low-cost piezoresistive force encoding sensor
(İstanbul Bilgi Üniversitesi, 2022) Akcan, Ömer Gökalp; Gökdel, Yiğit Dağhan; Baran, Eray A.
ABSTRACT: This thesis demonstrates design, implementation, and experimental results of a low-cost disposable ?exible sensor system capable of both impact localization and measurement. Proposed ?exible sensor structure utilizes a special series of Bristol paper as the main fabrication material, which is coated with electric paint graphite paste and silver paste. Implemented sensor system uses a planar absolute encoder-like sensing topology to locate the impact and has a low-cost and quick manufacturing process. The size of the structure is 210 mm × 18.56 mm with the thickness of approximately 340 µm. It has an electronic read-out consisting of three identical Wheatstone bridge circuits and instrumentation ampli?ers for each bit. It can detect the external forces in the range of 0.6N to 12N with a spatial resolution of 2.4 cm and 0.55 cm in horizontal and vertical axes, respectively. The proposed sensor structure is tested in a series of experiments using a robotic setup consisted of a pantograph mechanism and a direct drive linear motor. The experiments illustrate the results with measurement sensitivity as small as 1N and proper fatigue resilience against repetitive loads.