Chen Pi-Yun, Lin Hsu-Yung, Zhong Zi-Heng, Pai Neng-Sheng, Li Chien-Ming, Lin Chia-Hung
Department of Electrical Engineering National Chin-Yi University of Technology Taichung City Taiwan.
Department of Medicine of Chi Mei Medical Center Chien-Ming Li is with the Division of Infectious Diseases Tainan City Taiwan.
Healthc Technol Lett. 2024 Feb 27;11(6):427-436. doi: 10.1049/htl2.12075. eCollection 2024 Dec.
Vital signs such as heart rate (HR) and respiration rate (RR) are essential physiological parameters that are routinely used to monitor human health and bodily functions. They can be continuously monitored through contact or contactless measurements performed in the home or a hospital. In this study, a contactless Doppler radar W-band sensing system was used for short-range, contactless vital sign estimation. Frequency-modulated continuous wave (FMCW) measurements were performed to reduce the influence of a patient's micromotion. Sensing software was developed that can process the received chirps to filter and extract heartbeat and breathing rhythm signals. The proposed contactless sensing system eliminates the need for the contact electrodes, electric patches, photoelectric sensors, and conductive wires used in typical physiological sensing methods. The system operates at 76-81 GHz in FMCW mode and can detect objects on the basis of changes in frequency and phase. The obtained signals are used to precisely monitor a patient's HR and RR with minimal noise interference. In a laboratory setting, the heartbeats and breathing rhythm signals of healthy young participants were measured, and their HR and RR were estimated through frequency- and time-domain analyses. The experimental results confirmed the feasibility of the proposed W-band mm-wave radar for contactless and short-range continuous detection of human vital signs.
心率（HR）和呼吸频率（RR）等生命体征是重要的生理参数，常用于监测人体健康和身体机能。可以通过在家中或医院进行的接触式或非接触式测量来持续监测这些参数。在本研究中，一种非接触式多普勒雷达W波段传感系统被用于短距离、非接触式生命体征估计。进行了调频连续波（FMCW）测量以减少患者微运动的影响。开发了传感软件，该软件可以处理接收到的啁啾信号，以过滤和提取心跳和呼吸节律信号。所提出的非接触式传感系统无需使用典型生理传感方法中所用到的接触电极、电贴片、光电传感器和导线。该系统在FMCW模式下工作于76 - 81GHz，能够基于频率和相位变化检测物体。所获得的信号用于在最小噪声干扰的情况下精确监测患者的心率和呼吸频率。在实验室环境中，测量了健康年轻参与者的心跳和呼吸节律信号，并通过频域和时域分析估计了他们的心率和呼吸频率。实验结果证实了所提出的W波段毫米波雷达用于非接触式和短距离连续检测人体生命体征的可行性。
