Hu Shan, Bowlds Ryan L, Gu Ye, Yu Xun
University of Minnesota, Duluth, MN 55812, USA.
Annu Int Conf IEEE Eng Med Biol Soc. 2009;2009:2312-5. doi: 10.1109/IEMBS.2009.5335036.
This research proposes a PVDF film pulse wave sensor for use in driver's drowsiness detection. The sensor non-intrusively measures heart pulse wave from driver's palm and an adaptive filter is employed to cancel the measurement noise aroused by the changing of gripping force. Experimental results show clear pulse wave signals can be obtained. Two-hour driving simulation is performed for drowsiness detection tests. The low frequency to high frequency (LF/HF ratio) is calculated from power spectrum density (PSD) of subjects' heart rate time series. The LF/HF ratio shows decreasing trends as subjects go from awake to drowsy.
本研究提出一种用于驾驶员困倦检测的聚偏氟乙烯（PVDF）薄膜脉搏波传感器。该传感器以非侵入方式测量驾驶员手掌的心脏脉搏波，并采用自适应滤波器消除因握力变化引起的测量噪声。实验结果表明能够获得清晰的脉搏波信号。进行了两小时的驾驶模拟以进行困倦检测测试。从受试者心率时间序列的功率谱密度（PSD）计算低频与高频之比（LF/HF比）。随着受试者从清醒状态进入困倦状态，LF/HF比呈下降趋势。
