Optimization of all-textile capacitive sensor array for smart chair
Gleskova, Helena and Ishaku, Amayikai A. and Bednár, Tadeáš and Hudec, Róbert (2022) Optimization of all-textile capacitive sensor array for smart chair. IEEE Access, 10. pp. 48615-48621. ISSN 2169-3536 (https://doi.org/10.1109/ACCESS.2022.3171231)
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Abstract
All-textile capacitive sensor arrays made of a polyurethane foam, fabric and electrically-conducting yarn were fabricated for a 'smart chair'. Polyurethane foam slab that functioned as a dielectric medium was encased between two pieces of commercially available fabric. The electrically-conducting yarn was used to embroider the capacitor electrodes on both fabric pieces. The completed sensor arrays were investigated under normal compressive load with the targeted pressure range of 2 to 30 kPa for the chair seat and 2 to 8 kPa for the backrest. The sensor capacitance versus normal compressive load exhibited a load/unload hysteresis for all sensor arrays. The hysteresis was modelled with sigmoid function and much narrower hysteresis was observed when all sensors were loaded simultaneously, as opposed to their individual loading, allowing development of a phenomenological model for the former. Among the studied sensor arrays, the array with dimensions of 30 cm 30 cm made of a 10-mm-thick polyurethane foam with density of 18.6 kg/m3 was the most suitable for the following reasons: (a) unloaded sensor capacitance was ~2.7 pF, (b) the sensor location did not affect its response, (c) ~10 kg load applied across individual sensor raised its capacitance by ~12 pF, and (d) 60 kg load applied uniformly across the whole sensor array increased the capacitance by ~5 pF. During the compression of the individual sensors the top fabric affected the sensor's electro-mechanical response and elastic fabric would be favored for applications with non-uniform pressure distribution.
ORCID iDs
Gleskova, Helena ORCID: https://orcid.org/0000-0001-7195-9639, Ishaku, Amayikai A., Bednár, Tadeáš and Hudec, Róbert;-
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Item type: Article ID code: 80563 Dates: DateEvent29 April 2022Published29 April 2022Published Online13 April 2022Accepted14 February 2022SubmittedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering
Fine Arts > Drawing Design IllustrationDepartment: Faculty of Engineering > Electronic and Electrical Engineering Depositing user: Pure Administrator Date deposited: 05 May 2022 11:05 Last modified: 04 Oct 2024 00:38 URI: https://strathprints.strath.ac.uk/id/eprint/80563