ISEL - Eng. Elect. Tel. Comp. - Dissertações de Mestrado
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Browsing ISEL - Eng. Elect. Tel. Comp. - Dissertações de Mestrado by Author "Almeida, Daniel Gonçalves Pita Santos de"
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- Non-intrusive ECG acquisition test-bedPublication . Almeida, Daniel Gonçalves Pita Santos de; Costa, João Pedro Barrigana Ramos da; Lourenço, André RibeiroNowadays there is a variety of ElectroCardioGraphy (ECG) test equipment which can be used to assess the functionality of electrocardiographs. Current systems are intended for use in clinical or hospital environment, being highly accurate and more oriented to the generation of ECG tracings of arrhythmias, noise being fed from the power supplies, as well as deviations caused by breathing and muscular activity. There is a growing demand for devices that can capture the ECG waveform during daily routines, applications include fitness tracking, computer gaming, providing alerts to drowsy drivers or just non-intrusive health monitoring. As these devices become more popular, there is also the need to develop test equipment that can replicate such scenarios of operation. The system proposed in this project was developed for testing ECG devices for daily life use, in portable equipment and in less ideal environments, where there is more noise and interference, and in which the use of wet electrodes is impractical. In this project, a closed-loop test circuit is designed, allowing the testing of ECG platforms still in the development phase, which may be incorporated into devices used in everyday life. The developed circuit allows testing of these platforms using user-defined ECG waveforms, as well as performing differential mode and common-mode noise analysis, simulating ECG signal amplitude variations, variations in skin-electrode impedance, motion artifacts and lead-off events. The circuit developed in this project allows for the recording of the test result coming from the device under test for further processing. This project provides a novel application for a recently developed technique of impedance synthesis, based on transconductance amplifiers. Here the technique is applied to simulate the variations of the skin-electrode impedance.