OptoBeat

OptoBeat enable’s the acquisition of blood oxygen saturation monitoring by augmenting the smartphone’s camera system, focusing the light source, and leveraging extant computing capacity. With this system, we can use a skin tone measurement to adjust the ratios of the two source frequencies transmitted through the skin to calibrate the measurement of blood oxygen for a more accurate reading.

Specifically, we present the following contributions: 

• An experiment and quantitative analysis of how skin tone affects traditional pulse oximeters and a demonstration of how this can be remedied.

• The design of the OptoBeat optical sensing system and an experiment to validate the theory behind our design.

• The design, execution, and results from an ex-vivo experiment that validates the accuracy of pulse oximetry from healthy and critical SpO2 levels against the gold standard and the results of a human subject experiment to validate the efficacy of the device.