Ratiometric Artifact Reduction in Low Power Reflective Photoplethysmography
Ratiometric Artifact Reduction in Low Power Reflective Photoplethysmography
复制标题
低功率反射光电体积描记法中的比例伪影减少
DOI：
--
复制
发表时间：
2011
影响因子：
5.1
通讯作者：
Guang
中科院分区：
文献类型：
--
作者：
J. Patterson;Guang
本文提出了有效的信号处理技术，用于补偿运动伪影和环境光偏移的反射式光电容积脉搏波传感器适用于可穿戴应用。红外（IR）和红光吸收特性的比率比较消除了本质上是乘性的噪声，并且脉动吸收信号的幅度调制使得能够抑制加性噪声。低功耗、离散时间脉搏血氧仪平台用于捕获IR和红光体积描记图，以便用于分析的数据具有代表真实身体传感器网络设备将经历的噪声水平。所提出的伪影抑制算法被设计用于低功耗微控制器的实时实现，同时足够鲁棒以补偿环境光的变化水平以及减少运动引起的伪影的影响。该系统的性能说明其提取一个典型的体积描记图心率波形的能力，因为传感器受到一系列的物理干扰。
This paper presents effective signal-processing techniques for the compensation of motion artifacts and ambient light offsets in a reflective photoplethysmography sensor suitable for wearable applications. A ratiometric comparison of infrared (IR) and red absorption characteristics cancels out noise that is multiplicative in nature and amplitude modulation of pulsatile absorption signals enables rejection of additive noise. A low-power, discrete-time pulse-oximeter platform is used to capture IR and red photoplethysmograms so that the data used for analysis have noise levels representative of what a true body sensor network device would experience. The proposed artifact rejection algorithm is designed for real-time implementation with a low-power microcontroller while being robust enough to compensate for varying levels in ambient light as well as reducing the effects of motion-induced artifacts. The performance of the system is illustrated by its ability to extract a typical plethysmogram heart-rate waveform since the sensor is subjected to a range of physical disturbances.