Triple PPG Sensor for Measurement of Heart Pulse Transmission Parameters in Weak Magnetic Field Environment

The paper describes the design, realization, and testing of a prototype of a wearable device based on the photoplethysmography (PPG) principle consisting of three optical sensors working on transmittance/reflectance principle with wireless connection for real-time data transfer to the control device. The measurement in normal laboratory conditions confirms that PPG signals sensed in parallel can have adequate quality for use in the arterial blood pressure estimation based on heart rate and heart pulse transmission parameters. Experiments in a weak magnetic field environment with an inherent radiofrequency and electromagnetic disturbance verify functionality of the developed PPG sensor.