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This paper describes a novel method to estimate pulse arrival time (PAT) from the electrocardiogram (ECG) and the impedance plethysmogram (TPG) obtained by using a compact and easy-to-use handheld device with only four electrodes. A proof-of-concept has been carried out where PAT values obtained with the proposed device have been compared to PAT values measured between the ECG and the photoplethysmogram...
The Driven-Right-Leg (DRL) circuit has been used for about 50 years to reduce interference due to common-mode voltage in biopotential amplifiers in scenarios that range from fixed equipment supplied from power lines to battery-supplied ambulatory monitors, and for systems that use gelled, dry, textile, and capacitive electrodes. However, power-line interference models predict that for isolation amplifiers,...
Biopotential measurements with capacitive electrodes do not need any direct contact between electrode and skin, which saves the time devoted to expose and prepare the contact area when measuring with conductive electrodes. However, mechanical vibrations resulting from physiological functions such as respiration and cardiac contraction can change the capacitance of the electrode and affect the recordings...
Electronic bathroom scales are an easy-to-use, affordable mean to measure physiological parameters in addition to body weight. They have been proposed to obtain the ballistocardiogram (BCG) and derive from it the heart rate, cardiac output and systolic blood pressure. Therefore, weighing scales may suit intermittent monitoring in e-health and patient screening. Scales intended for bioelectrical impedance...
Fully differential AC amplifiers can easily be designed by placing an AC-coupling network in front of a fully differential DC amplifier. Such a network, however, must have a high common-mode rejection ratio (CMRR) to keep the overall CMRR high. In principle, passive AC-coupling networks that include no grounded components have an infinite CMRR, but they must provide a path for input bias currents...
A novel liquid interface level sensor is presented that is able to determine the position of the interface between a conductive and an insulating liquid. The sensor consists of an array of equally spaced electrodes, two of which are used to inject a current into the conductive liquid and the remaining electrodes are used to measure the drop in voltage across the conductive medium. An inverse problem...
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