Chang Wen-Ying, Huang Chien-Chun, Chen Chi-Chun, Chang Chih-Cheng, Yang Chin-Lung
Department of Electrical Engineering, National Cheng-Kung University, Tainan 701, Taiwan.
Biomedical Electronics Translational Research Center, National Chiao Tung University, Hsinchu 300, Taiwan.
Sensors (Basel). 2014 Nov 20;14(11):22021-38. doi: 10.3390/s141122021.
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.
本文提出了一种使用专为个人健康评估设计的柔性投影电容式传感床垫（FPCSM）来提取呼吸信号的算法。与传统的多导睡眠图（PSG）测量系统及其他当代替代系统的接口不同，所提出的FPCSM利用的是不穿戴在身体上或附着于身体的投影电容式传感能力。FPCSM由多电极传感器阵列组成，该阵列不仅可以观察手势和运动行为，还能通过所提出的方法使FPCSM在睡眠期间用作呼吸监测器。为了在可能存在身体运动的情况下改善长期监测，FPCSM能够从传感阵列中选择数据，并且FPCSM方法在应用将电容式传感信号中的反转次数作为质量指标的通道缩减算法之后，选择具有最佳信号的电极。该简单算法在时域中实现。FPCSM系统用于实验测试，并同时与商用PSG系统进行比较以进行验证。从身体接触的不同位置进行多次同步测量，并收集并行数据集。实验比较得出FPCSM与PSG之间的相关系数为0.88，证明了系统设计的可行性。
