A STUDY REGARDING THE ACQUISITION OF PHOTOPLETHYSMOGRAPIC SIGNAL USED IN DETERMINATION OF THE PRV PARAMETERS
A STUDY REGARDING THE ACQUISITION OF PHOTOPLETHYSMOGRAPIC SIGNAL USED IN DETERMINATION OF THE PRV PARAMETERS

Summary/Abstract: In this paper, two areas for collecting the photoplethysmographic signal were studied. The areas of interest we have considered are the index of the left hand and the lobe of the left ear. To record these signals we have created a portable system. To achieve this system we used 3 biological signal detection modules. With this system, three biological signals were recorded, namely, the electrocardiographic signal (ECG) acquired with the help of three electrodes, the PPG signal acquired from the left-hand index and the PPG signal acquired from the ear lobe. For the ECG signal, we used the AD8232 module, compatible with Arduino kits. For the photoplethysmographic signal, we used a pulse sensor, and for the other signal, we used an earlobe clip sensor, which generates a rectangular signal. The recordings of these signals were made on 16 subjects. All the recordings were made in the same way, with the subjects sitting on the chair. The signals were recorded simultaneously, using the same sampling frequency, to have a closer approximation in detecting the time interval between two cardiac cycles. From the recorded signals we determined the heart rate variability (HRV) parameters and the pulse rate variability (PRV) parameters from the two photoplethysmographic signals. With the data obtained we made 2 correlations as follows: a correlation between HRV parameters with PRV parameters determined from the left-hand index, and the second correlation was made between HRV parameters and PRV parameters determined from the signal acquired from the left earlobe, and the values obtained for both correlations are over 98%.

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