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Screen Printed Piezoresistive Sensors for Monitoring Pressure Distribution in Wheelchair
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.ORCID iD: 0000-0001-7395-3687
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.ORCID iD: 0000-0003-2965-0288
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
2019 (English)In: IEEE Sensors Journal, ISSN 1530-437X, E-ISSN 1558-1748, Vol. 19, no 6, p. 2055-2063Article in journal (Refereed) Published
Abstract [en]

Prolonged sitting inadequacies cause pressure ulcer to many individuals, especially to disadvantaged with reduced mobility. The measurement of distributed pressure and detection of irregular sitting postures is essential for preventing the risk of developing pressure ulcer. In this paper, a pressure sensing system capable of recognizing sitting postures by means of measuring interface pressure through printed pressure sensors is presented. A thin and flexible large area sensor is screen-printed using silver flake and carbon particle inks and comprises 16 sensing elements. For the evaluation of practical usability, the sensor characterization is carried out by conducting stability, repeatability, drift and bending tests. The performance of the sensor is checked under varying environmental conditions. Sitting posture detection accuracy above 80 % is achieved using a classification algorithm for four different sitting postures. Pressure distribution is monitored at a scanning rate of 10 Hz. A low power and small form factor of read-out electronics enables a compact packaging inside the seat cushion. The presented sensor design targets smart wheelchairs, but it is extendable to much larger areas, for example to be used in beds. The proposed sensing system would be of a great assistance for caregivers and health professionals.

Place, publisher, year, edition, pages
IEEE, 2019. Vol. 19, no 6, p. 2055-2063
Keywords [en]
Pressure sensors, wheelchair, conductive inks, sitting posture recognition, pressure mapping, screen-printing
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-35133DOI: 10.1109/JSEN.2018.2885638ISI: 000459513100009Scopus ID: 2-s2.0-85058158693OAI: oai:DiVA.org:miun-35133DiVA, id: diva2:1269289
Projects
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2019-10-16Bibliographically approved
In thesis
1. Screen Printed Large Area Sensors for Pressure Distribution Monitoring in Wheelchairs
Open this publication in new window or tab >>Screen Printed Large Area Sensors for Pressure Distribution Monitoring in Wheelchairs
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

A sedentary lifestyle can induce health related problems including pressure ulcers. Pro­longed sitting inadequacies constitute a risk for pressure ulcer to many individuals, in particular people with disabilities and re­duced mobility. The measurement of distributed pressure and detection of irregular sitting postures are essential in prevention of the risk of developing pres­sure ulcers.

In this thesis, a screen-printed pressure sensor for a large area is presented, with the objective of measuring the distributed pressure of a seated per­son in a wheelchair. The conductors and interdigital patterns are printed with silver-based ink. A blend of a non-conductive and a low resis­tive ink is used for customized resistance for an optimal sensing range of the pressure sensor. The effect of moisture and temper­ature are realized in an environment chamber. For characterization, other key performance tests such as repeatability, drift and flexibility are carried out. The surface morphology is carried out for structural analysis of printed samples. The sensor data is acquired and processed using an 8-bit ATmega-2560 micro­controller and wirelessly transmitted to a PC for post-processing, storage and analysis. For real-time data presentation of dis­tributed pressure points, a GUI has been developed to display the values ob­tained from the large area sensor. The detection of four sit­ting pos­tures; forward leaning, backward leaning, left leaning and right leaning along with a normal sitting posture is attained. An analysis for stretchable printed tracks has been conducted to investigate the changes in electrical resistance using elon­ga­tion tests, surface morphology and EDS. The optimal curing time and tem­per­ature were investigated to manufacture stretchable conductive tracks.

In summary, the contributions in this thesis provides an effective approach regarding pressure distribution measurement and recognizing irregular sitting postures for wheelchair users.

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2019. p. 38
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 159
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-36139 (URN)978-91-88947-05-5 (ISBN)
Presentation
2019-06-04, M 108, Holmgatan 10, 85170, Sundsvall, 09:30 (English)
Opponent
Supervisors
Note

Vid tidpunkten för framläggningen av avhandlingen var följande delarbete opublicerat: delarbete 3 (accepterat).

At the time of the defence the following paper was unpublished: paper 3 (accepted).

Available from: 2019-05-15 Created: 2019-05-15 Last updated: 2019-05-15Bibliographically approved

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Ahmad, JawadAndersson, HenrikSidén, Johan

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