Photoplethysmography (PPG) device and method for determining physiological changes

摘要

Disclosed is a light blood flow measurement (PPG) device 100 for discriminating physiological changes, a light source emitting an optical signal having a variable intensity according to skin characteristics; First and second photodetectors 130 operable to detect reflection of the optical signal to provide a combined current signal; And a signal processing circuit operable to convert the current signal into a PPG signal for determining a physiological change.