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This paper investigates the feasibility of a ratio metric approach to compensating for ambient light and motion artefacts in a reflective photoplethysmography (PPG) sensor suitable for wearable applications. A low-power, discrete-time pulse-oximeter development platform is used to capture both infra-red (IR) and red photoplethysmograms, as well as the ambient light level, such that the data used for...
Photoplethysmographic (PPG) signals obtained at Red and Infrared wavelengths are utilized in pulse oximetry for estimation of arterial blood oxygen saturation (SpO2). Mostly inaccurate readings in a pulse oximeter arise when PPG signals are contaminated with motion artifacts (MA) due to the movement of patient and hence MA are a common cause of oximeter failure and loss of accuracy. This paper presents...
Photoplethysmography (PPG) is a non-invasive optical technique that enables to quantify the arterial blood pulse rate derived from the cardiac pumping action. Although this technique is widely used in the medical practice as part of pulse oximeters, the signal corruption by motion artifacts is a primary limitation in the practical accuracy and applicability of current instruments to monitor pulse...
Pulse oximeters require artifact-free clean photoplethysmograph (PPG) signals obtained at red and infrared (IR) wavelengths for the estimation of the level of oxygen saturation ( SpO2) in the arterial blood of a patient. Movement of a patient corrupts a PPG signal with motion artifacts and introduces large errors in the computation of SpO2. A novel method for removing motion artifacts from corrupted...
Heart rate variability and motion artifact are two major obstacles to the photoplethysmographic (PPG) signal analysis, which is a very promising tool to derive useful information about the hemodynamics as well as autonomic nerve system. This paper suggests employing a truncation/extrapolation method on the PPG signal or its first order derivative to overcome the heart rate variability problem while...
This paper presents a photoplethysmography sensor based on a heart rate monitor for a portable MP3 player. Two major design issues are addressed: one is to acquire the sensor signal with a proper amplitude despite a wide range of variation and the other is to handle the noise contaminated signal which is caused by a motion artifact. A benchmarking test with a professional medical photoplethysmography...
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