Abstract
In this paper we report a unique approach to measuring oxygen saturation levels by utilising the wavelength of the haemoglobin instead of the conventional absorption difference. Two experiments are set up to measure the wavelength of the haemoglobin bound to oxygen at different oxygen saturation levels with the help of a spectrometer. We report a unique low cost and robust wavelength monitoring SpO2 sensor that measures the SpO2 by using the colour of the blood and not the absorption difference of oxyhaemoglobin and deoxyhaemoglobin. With use of a spectrometer, we show that the wavelength of the oxygen-bound haemoglobin has a relation to the oxygen saturation level. The proposed device is designed and experimentally implemented with a colour sensor to measure the SpO2 level of the blood.
Highlights
In 1945, most deaths occurred in the home
We have demonstrated a SpO2 optical sensor monitoring device that would be able to be placed on the human body as a finger ring
We have developed the experiment and tested the proposed SpO2 optical sensor ring on real patients, where it has been shown to be accurate
Summary
In 1945, most deaths occurred in the home. By the 1980s, it was reduced to just 17% [1]. We explain a unique way of measuring SpO2 by using the colour of the blood and not the absorption difference of oxyhaemoglobin and deoxyhaemoglobin This method is produced as a ring and not an extremity device for easier use within the home mainly due to the purpose of a user being able to use their fingers if the device was as a ring and not on the end of the finger. The x-axis represents the wavelength measured in nm and the y-axis is the intensity level that can be changed by the colour of the skin, thickness of the finger and the amount of light received by the spectrometer. As the spectrometer is very expensive and difficult to fit into a ringed device, it seemed appropriate to implement a device that can view the change of wavelength
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