Present wearable sensors are able to measure the frequency of vital signs such as respiration rate and heartbeat rate, but unable to measure those quantitatively, e.g. respiratory volume and heartbeat strength. Meanwhile, airflow at mouth contains both the respiration and the heartbeat quantitative signals. In this study, we propose a calibration method for a wearable vital sensor attached on the chest using the airflow at the mouth for quantitative respiration monitoring. An artificial ventilator and an experimental animal were introduced as test benches prior to human clinical experiment. As a proof of concept, a micro-electro mechanical systems (MEMS) airflow sensor and a wearable accelerometer were implemented to both the test benches. The velocity output of the piston motion measured by the wearable sensor conformed with the airflow rate output, and the obtained results indicated that the wearable sensor can monitor not only the frequency of vital signs but also quantitative magnitudes such as the respiratory volume. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

中文翻译：

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使用口腔气流对可穿戴传感器进行定量呼吸监测的校准方法的研究

目前的可穿戴传感器能够测量呼吸频率和心跳频率等生命体征的频率，但无法定量测量呼吸量和心跳强度等生命体征。同时，口腔气流中同时包含呼吸和心跳定量信号。在这项研究中，我们提出了一种安装在胸部的可穿戴生命传感器的校准方法，利用口腔气流进行定量呼吸监测。在人体临床实验之前，引入人工呼吸机和实验动物作为试验台。作为概念验证，两个测试台均配备了微机电系统 (MEMS) 气流传感器和可穿戴加速度计。可穿戴式传感器测量的活塞运动的速度输出与气流速率输出一致，所得结果表明可穿戴式传感器不仅可以监测生命体征的频率，还可以监测呼吸量等定量量值。 © 2024 日本电气工程师协会和 Wiley periodicals LLC。