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

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

研究成果: 雜誌貢獻文章同行評審

23 引文 斯高帕斯(Scopus)


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.
頁(從 - 到)6922-6937
期刊Sensors (Switzerland)
出版狀態已發佈 - 4月 17 2014

ASJC Scopus subject areas

  • 分析化學
  • 原子與分子物理與光學
  • 生物化學
  • 儀器
  • 電氣與電子工程


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