A nail tip sensor that can provide long‐term vital data acquisition without uncomfortable wearing feel is described and discussed. Through 24 h continuous measurement under daily life environment, the proposed nail tip photoplethysmographic (PPG) sensor circuit works effectively and shows no deterioration in the quality of PPG waveform due to aging, peeling, flooding, or vibration. The waveform of measured pulse obtained from the nail tip PPG sensor is consistent with that from electrocardiograph (ECG), excluding the time when saturation or undershoot due to body motion artifact is dominant. Heart rates calculated from PPG and ECG pulse waves with simple algorithm are correlated with each other, and show circadian variation and respiratory variation. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

中文翻译：

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指甲尖传感器：进行可靠的全天心率监测

描述并讨论了可以提供长期生命数据采集而又不会带来不舒适佩戴感的指甲尖传感器。通过在日常生活环境下进行24小时连续测量，所提出的指甲尖端光电容积描记（PPG）传感器电路可以有效工作，并且不会由于老化，剥落，浸水或振动而导致PPG波形质量下降。从指甲尖端PPG传感器获得的测量脉冲波形与从心电图仪（ECG）获得的脉冲波形一致，但不包括由于人体运动伪影导致的饱和或下冲占主导的时间。使用简单算法从PPG和ECG脉波计算出的心率相互关联，并显示昼夜节律变化和呼吸变化。©2020日本电气工程师学会。由John Wiley＆Sons，Inc.发布