Next Article in Journal
A Discriminant Distance Based Composite Vector Selection Method for Odor Classification
Previous Article in Journal
Novel Piezoelectric Effect and Surface Plasmon Resonance-Based Elements for MEMS Applications
Article Menu

Export Article

Open AccessArticle
Sensors 2014, 14(4), 6922-6937; doi:10.3390/s140406922

An Enhanced Sensing Application Based on a Flexible Projected Capacitive-Sensing Mattress

1
Department of Electrical Engineering, National Cheng-Kung University, Tainan 701, Taiwan
2
Department of Pulmonary Medicine, Taipei Medical University Shuang-Ho Hospital, Taipei 235, Taiwan
*
Author to whom correspondence should be addressed.
Received: 24 January 2014 / Revised: 11 April 2014 / Accepted: 14 April 2014 / Published: 17 April 2014
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [796 KB, uploaded 21 June 2014]   |  

Abstract

This paper presents a cost-effective sensor system for mattresses that can classify the sleeping posture of an individual and prevent pressure ulcers. This system applies projected capacitive sensing to the field of health care. The charge time (CT) method was used to sensitively and accurately measure the capacitance of the projected electrodes. The required characteristics of the projected capacitor were identified to develop large-area applications for sensory mattresses. The area of the electrodes, the use of shielding, and the increased length of the transmission line were calibrated to more accurately measure the capacitance of the electrodes in large-size applications. To offer the users comfort in the prone position, a flexible substrate was selected and covered with 16 × 20 electrodes. Compared with the static charge sensitive bed (SCSB), our proposed system-flexible projected capacitive-sensing mattress (FPCSM) comes with more electrodes to increase the resolution of posture identification. As for the body pressure system (BPS), the FPCSM has advantages such as lower cost, higher aging-resistance capability, and the ability to sense the capacitance of the covered regions without physical contact. The proposed guard ring design effectively absorbs the noise and interrupts leakage paths. The projected capacitive electrode is suitable for proximity-sensing applications and succeeds at quickly recognizing the sleeping pattern of the user. View Full-Text
Keywords: flexible projected capacitive-sensing technologies; charge time; guard ring; health care mattress flexible projected capacitive-sensing technologies; charge time; guard ring; health care mattress
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Chang, W.-Y.; Chen, C.-C.; Chang, C.-C.; Yang, C.-L. An Enhanced Sensing Application Based on a Flexible Projected Capacitive-Sensing Mattress. Sensors 2014, 14, 6922-6937.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top