An enhanced sensing application based on a flexible projected capacitive-sensing mattress

Wen Ying Chang, Chi Chun Chen, Chih Cheng Chang, Chin Lung Yang

Research output: Contribution to journalArticle

13 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)6922-6937
Number of pages16
JournalSensors (Switzerland)
Volume14
Issue number4
DOIs
Publication statusPublished - Apr 17 2014

Fingerprint

Electrodes
electrodes
posture
Capacitance
capacitance
Posture
prone position
ulcers
Costs and Cost Analysis
Prone Position
comfort
Pressure Ulcer
Static Electricity
Health care
Shielding
transmission lines
health
shielding
Noise
proximity

Keywords

  • Charge time
  • Flexible projected capacitive-sensing technologies
  • Guard ring
  • Health care mattress

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

An enhanced sensing application based on a flexible projected capacitive-sensing mattress. / Chang, Wen Ying; Chen, Chi Chun; Chang, Chih Cheng; Yang, Chin Lung.

In: Sensors (Switzerland), Vol. 14, No. 4, 17.04.2014, p. 6922-6937.

Research output: Contribution to journalArticle

Chang, Wen Ying ; Chen, Chi Chun ; Chang, Chih Cheng ; Yang, Chin Lung. / An enhanced sensing application based on a flexible projected capacitive-sensing mattress. In: Sensors (Switzerland). 2014 ; Vol. 14, No. 4. pp. 6922-6937.
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