title: Design of a novel flexible capacitive sensing mattress for monitoring sleeping respiratory.
abstract: In this paper, an algorithm to extract respiration signals using a flexible projected capacitive sensing mattress (FPCSM) designed for personal health assessment is proposed. Unlike the interfaces of conventional measurement systems for poly-somnography (PSG) and other alternative contemporary systems, the proposed FPCSM uses projected capacitive sensing capability that is not worn or attached to the body. The FPCSM is composed of a multi-electrode sensor array that can not only observe gestures and motion behaviors, but also enables the FPCSM to function as a respiration monitor during sleep using the proposed approach. To improve long-term monitoring when body movement is possible, the FPCSM enables the selection of data from the sensing array, and the FPCSM methodology selects the electrodes with the optimal signals after the application of a channel reduction algorithm that counts the reversals in the capacitive sensing signals as a quality indicator. The simple algorithm is implemented in the time domain. The FPCSM system is used in experimental tests and is simultaneously compared with a commercial PSG system for verification. Multiple synchronous measurements are performed from different locations of body contact, and parallel data sets are collected. The experimental comparison yields a correlation coefficient of 0.88 between FPCSM and PSG, demonstrating the feasibility of the system design.
authors.affiliation: Department of Electrical Engineering, National Cheng-Kung University, Tainan 701, Taiwan. ee78350526@gmail.com.
authors.forename: Wen-Ying
authors.initials: WY
authors.lastname: Chang
authors.affiliation: Biomedical Electronics Translational Research Center, National Chiao Tung University, Hsinchu 300, Taiwan. chienchun@gmail.com.
authors.forename: Chien-Chun
authors.initials: CC
authors.lastname: Huang
authors.affiliation: Department of Electrical Engineering, National Cheng-Kung University, Tainan 701, Taiwan. chichun19771007@gmail.com.
authors.forename: Chi-Chun
authors.initials: CC
authors.lastname: Chen
authors.affiliation: Division of Pulmonary Medicine, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, Taipei 235, Taiwan. 09005@s.tmu.edu.tw.
authors.forename: Chih-Cheng
authors.initials: CC
authors.lastname: Chang
authors.affiliation: Department of Electrical Engineering, National Cheng-Kung University, Tainan 701, Taiwan. cyang@mail.ncku.edu.tw.
authors.forename: Chin-Lung
authors.initials: CL
authors.lastname: Yang
mesh_terms: D001513:Beds; D003217:Conductometry / Q000295:instrumentation*; D055119:Elastic Modulus; D025802:Electric Capacitance; D004582:Electronics, Medical / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D017286:Polysomnography / Q000295:instrumentation*; D015203:Reproducibility of Results; D012129:Respiratory Function Tests / Q000295:instrumentation*; D015656:Respiratory Mechanics / Q000502:physiology*; D012680:Sensitivity and Specificity; D014159:Transducers