I collected up to 20 samples of different races and gender. While reading these data they were some unpleasant results, and this was due to some factors.
Firstly, we noticed that the red led overheats over time and tends to give inaccurate readings and the infrared light didn’t overheat so we added a breadboard with a 440 ohms resistor to avoid overheating and stabilized the reading. Secondly, after some research on the commercial pulse oximeter, we noticed the pulse oximeter goes through a cycle of red on and infrared off, red off and infrared on, red off, and infrared off under one second. This was a challenge for us because our sensor (TSL2591) could not read that fast and we considered increasing the integration time and gain but the consequence of doing this was that the accuracy of the reading would reduce. So, we wrote a code that gives reads 5 times per second but what we wanted was 10 times per second.
Towards the middle of the week, I moved my attention to researching written articles and journals on Pulse Oximeter. Below are some cited articles and journals that I studied.
Sjoding, Michael W., et al. “Racial Bias in Pulse Oximetry Measurement.” New England Journal of Medicine, vol. 383, no. 25, Dec. 2020, pp. 2477–78. Taylor and Francis+NEJM, doi:10.1056/NEJMc2029240.
Yossef Hay, Ohad, et al. “Pulse Oximetry with Two Infrared Wavelengths without Calibration in Extracted Arterial Blood.” Sensors (Basel, Switzerland), vol. 18, no. 10, Oct. 2018, p. 3457. PubMed Central, doi:10.3390/s18103457.
Zonios, George, et al. “Melanin Absorption Spectroscopy: New Method for Noninvasive Skin Investigation and Melanoma Detection.” Journal of Biomedical Optics, vol. 13, no. 1, International Society for Optics and Photonics, Jan. 2008, p. 014017. www.spiedigitallibrary.org, doi:10.1117/1.2844710.
