An Enhanced Sensing Application Based on a Flexible Projected Capacitive-Sensing MattressReport as inadecuate




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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





*

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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





Author: Wen-Ying Chang 1, Chi-Chun Chen 1, Chih-Cheng Chang 2 and Chin-Lung Yang 1,*

Source: http://mdpi.com/



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