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Screen Printed Large Area Sensors for Pressure Distribution Monitoring in Wheelchairs
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för elektronikkonstruktion. (SMART)ORCID-id: 0000-0001-7395-3687
2019 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Sundsvall: Mid Sweden University , 2019. , s. 38
Serie
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 159
HSV kategori
Identifikatorer
URN: urn:nbn:se:miun:diva-36139ISBN: 978-91-88947-05-5 (tryckt)OAI: oai:DiVA.org:miun-36139DiVA, id: diva2:1315861
Presentation
2019-06-04, M 108, Holmgatan 10, 85170, Sundsvall, 09:30 (engelsk)
Opponent
Veileder
Merknad

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).

Tilgjengelig fra: 2019-05-15 Laget: 2019-05-15 Sist oppdatert: 2019-05-15bibliografisk kontrollert
Delarbeid
1. Sitting Posture Recognition using Screen Printed Large Area Pressure Sensors
Åpne denne publikasjonen i ny fane eller vindu >>Sitting Posture Recognition using Screen Printed Large Area Pressure Sensors
2017 (engelsk)Inngår i: Proceedings of IEEE Sensors, IEEE, 2017, s. 232-234Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

In the biomedical sector, pressure sensors exhibit an important role towards monitoring and recognition of sitting posture for wheelchair users, which is helpful for pressure ulcer prevention and cure.  In this paper, a flexible and inexpensive screen printed large area pressure sensing system is presented. The large area sensor comprise three layers, is able to cancel-out false pressure detection, and achieves a sitting classification accuracy over 80 percent. The sensor matrix contains 16 sensors distributed over an area of 23.5 cm × 21.5 cm and the pressure points are monitored at a scanning rate of 77 Hz. The sensor system provides wireless communication and a Windows based GUI is developed that allows real-time presentation of pressure data by means of a pressure map. The presented sensor design targets smart wheelchairs but is suitable for any low cost and high throughput pressure distribution monitoring systems. 

sted, utgiver, år, opplag, sider
IEEE, 2017
Serie
IEEE Sensors, ISSN 1930-0395
Emneord
Wheelchair, pressure sensors, conductive inks, pressure mapping, sitting posture recognition
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-32324 (URN)10.1109/ICSENS.2017.8233944 (DOI)000427677500077 ()2-s2.0-85044326019 (Scopus ID)978-1-5090-1012-7 (ISBN)
Konferanse
16th IEEE SENSORS Conference, ICSENS 2017; Scottish Event Campus (SEC) Glasgow; United Kingdom; 30 October 2017 through 1 November 2017
Prosjekter
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Tilgjengelig fra: 2017-12-07 Laget: 2017-12-07 Sist oppdatert: 2019-09-09bibliografisk kontrollert
2. Screen Printed Piezoresistive Sensors for Monitoring Pressure Distribution in Wheelchair
Åpne denne publikasjonen i ny fane eller vindu >>Screen Printed Piezoresistive Sensors for Monitoring Pressure Distribution in Wheelchair
2019 (engelsk)Inngår i: IEEE Sensors Journal, ISSN 1530-437X, E-ISSN 1558-1748, Vol. 19, nr 6, s. 2055-2063Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
IEEE, 2019
Emneord
Pressure sensors, wheelchair, conductive inks, sitting posture recognition, pressure mapping, screen-printing
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-35133 (URN)10.1109/JSEN.2018.2885638 (DOI)000459513100009 ()
Prosjekter
SMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Tilgjengelig fra: 2018-12-10 Laget: 2018-12-10 Sist oppdatert: 2019-09-09bibliografisk kontrollert
3. An Analysis of Screen-Printed Stretchable Conductive Tracks on Thermoplastic Polyurethane
Åpne denne publikasjonen i ny fane eller vindu >>An Analysis of Screen-Printed Stretchable Conductive Tracks on Thermoplastic Polyurethane
2019 (engelsk)Konferansepaper, Publicerat paper (Annet vitenskapelig)
Identifikatorer
urn:nbn:se:miun:diva-36146 (URN)10.1109/FLEPS.2019.8792266 (DOI)2-s2.0-85071395576 (Scopus ID)
Konferanse
IEEE Fleps 2019, IEEE International Conference on Flexible and Printable Sensors and Systems, Glasgow, Scotland, July 7-9, 2019
Tilgjengelig fra: 2019-05-15 Laget: 2019-05-15 Sist oppdatert: 2019-09-06bibliografisk kontrollert

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