A miniaturized, telemetric, photoplethysmograph (PPG) sensor for long-term, continuous monitoring is presented in this paper. The sensor, called a "ring sensor," is attached to a finger base for monitoring beat-to-beat pulsation, and the data is sent to a host computer via a radio-frequency transmitter. Two major design issues are addressed: one is to minimize motion artifact and the other is to minimize the consumption of battery power. An efficient double ring design is developed to lower the influence of external force, acceleration, and ambient light, and to hold the sensor gently and securely on the skin, so that the circulation at the finger may not be obstructed. Total power consumption is analyzed in relation to characteristics of individual components, sampling rate, and CPU clock speed. Optimal operating conditions are obtained for minimizing the power budget. A prototype ring sensor is designed and built based on the power budget analysis and the artifact-resistive attachment method. It is verified through experiments that the ring sensor is resistant to interfering forces and acceleration acting on the ring body. Benchmarking tests with FDA-approved PPG and electrocardiogram reveal that the ring sensor is comparable to those devices in detecting beat-to-beat pulsation despite disturbances.

译文

:本文介绍了一种用于长期连续监测的小型遥测光体积描记器(PPG)传感器。称为“环形传感器”的传感器连接到手指基座,用于监视心跳到心跳的脉动,并且数据通过射频发射器发送到主机。解决了两个主要设计问题:一个是最小化运动伪影,另一个是最小化电池电量的消耗。开发出了一种有效的双环设计,以降低外力,加速度和环境光的影响,并将传感器轻轻牢固地固定在皮肤上,从而不会阻碍手指的循环。分析总功耗与各个组件的特性,采样率和CPU时钟速度有关。获得了最佳的工作条件,以最大程度地减少功率预算。基于功率预算分析和抗伪像的附着方法,设计并构建了原型环形传感器。通过实验证明,环形传感器能够抵抗作用在环形本体上的干扰力和加速度。通过FDA批准的PPG和心电图进行的基准测试表明,尽管存在干扰,但环形传感器在检测心跳到心跳脉搏方面可与那些设备媲美。

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