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Pulse Oximetry Using Organic Optoelectronics under Ambient Light
Author(s) -
Han Donggeon,
Khan Yasser,
Ting Jonathan,
Zhu Juan,
Combe Craig,
Wadsworth Andrew,
McCulloch Iain,
Arias Ana C.
Publication year - 2020
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201901122
Subject(s) - photoplethysmogram , light emitting diode , materials science , photodiode , optoelectronics , wavelength , pulse oximetry , visible spectrum , optics , infrared , near infrared spectroscopy , diode , telecommunications , medicine , computer science , physics , anesthesia , wireless
Light absorption in oxygenated and deoxygenated blood varies appreciably over the visible and near‐infrared spectrum. Pulse oximeters use two distinct wavelengths of light to measure oxygen saturation SpO 2 of blood. Currently, light‐emitting diodes (LEDs) are used in oximeters, which need additional components to drive them and negatively impact the overall size of the sensor. In this work, an ambient light oximeter (ALO) is demonstrated, which can measure photoplethysmography signals and SpO 2 using various kinds of ambient light, avoiding the use of LEDs. Spectral filters are combined with organic photodiodes to create the ALO with sensitivity peaks at green (525 nm), red (610 nm), and near‐infrared (740 nm) wavelengths. Finally, the wearable ALO is used to measure photoplethysmography signals and SpO 2 on the index finger in different indoor and outdoor lighting conditions and the measurements are validated with commercial pulse oximeters under normal and ischemic conditions.