An indigenous PPG acquisition system using monolithic photo-detector OPT101

Photoplethysmograph is an optical procedure used to determine the physiological parameters identified with cardiovascular system. This paper focuses on the design of PPG acquisition system with reflectance type of sensor circuit to extract the features such as systolic peak, diastolic peak and dicrotic notch. The designed system is tested on 50 subjects of different age groups and the amplitude of PPG signal after signal conditioning ranges between 5 to 8 V. The analysis on distortion free PPG signal resulted in parameters such as augmentation index, reflection index and stiffness index. The designed system is more reliable for motion artefacts.