Design of Low Power Pulse Oximeter for Early Detection of Hypoxemia

Abstract

This paper involves designing a low power yet effective pulse oximetry system for detection of Hypoxemia especially for patients from developing and under-developed nations where the cost of any medical device is a primary concern. For this non-invasive technique to draw results from the behavior of light absorption pattern shown by blood, we decided on using a simple red LED and an infrared LED, with wavelength of 660nm and 940nm respectively. We used a receiver module on the other side to collect the refracted light. As predicted, the graph of the refracted light intensity mimicked the heart rate pattern of an individual. This proved to be helpful in drawing results such as heart rate and oxygen saturation level in the blood.