Session 17: Sensors & Power
System Design for Flexible All-Organic Reflectance Oximeter
Thursday, February 15, 2018
10:15 AM - 10:40 AM
Existing techniques for measuring oxygen concentration in blood heavily relies on non-invasive transmission-mode pulse oximetry - a ratiometric optical sensing method, where light absorption in oxygenated and deoxygenated blood is interpreted to a person’s oxygen saturation (SpO2). Since transmitted light through tissues is used to generate the signal, transmission-mode pulse oximetry is restricted to only tissues that can be transilluminated, such as the ear and the fingers. Here, we present a reflection oximeter, which uses printed organic light-emitting diodes (OLEDs) and organic photodiodes (OPDs) to sense reflected light from tissues to determine the oxygen concentration. Using the reflection-mode, the sensor can be used beyond the conventional sensing locations. We used the reflection-mode sensor to measure SpO2 on the forehead with 1.1% mean error. We also demonstrate a method to determine oxygen saturation in the absence of pulsatile blood. Additionally, printing techniques are utilized to fabricate the sensor on flexible plastic substrates, making the sensor both comfortable to wear and efficient at extracting high-quality biosignal.
Dr. Ana Claudia Arias is a Professor at the Electrical Engineering and Computer Sciences Department at the University of California in Berkeley and a faculty director at the Berkeley Wireless Research Center (BWRC) and SWARM lab. Prior to joining the University of California she was the head of the Printed Electronic Devices Area and a Member of Research Staff at PARC, a Xerox Company, Palo Alto, CA. She went to PARC from Plastic Logic in Cambridge, UK where she led the semiconductor group. She received her PhD on semiconducting polymer blends for photovoltaic devices from the Physics Department at the University of Cambridge, UK. Prior to that, she received her master and bachelor degrees in Physics from the Federal University of Paraná in Curitiba, Brazil. Her research focuses on devices based on solution processed materials and applications development for flexible sensors and electronic systems. Ana Claudia is a co-founder of InkSpace Imaging, the chair of ThinFilm Electronics Technical Advisory Council and an author of over 100 peer-reviewed publications and issued patents.
Ana Claudia Arias
University of California, Berkeley