When you slide the oximeter over the finger or ear lobe optical sensor performs its duty. The optical sensor detects pulse rate and oxygen level and converts this input data into the digital signal form. This digital signal is directly fed to the microcontroller board, after that logic circuit board processes the signal on the basis of input data and sends it to the display unit. All the electronic units of the oximeter are being powered by a 3-volt battery or two 1.5-volt batteries.
Oximeters are still needed improvement in their optical sensors and data processing or logical unit. The final output value or reading on display is not very accurate. They are showing variations while calculating the pulse rate or oxygen level because of limitations in the optical sensor. Whereas many manufacturers are trying to improve their product and some of them are doing their job very well. At present time some of the oximeters are providing accurate information. Nowadays some smartwatches are having the functionality of the oximeter. The price of a normal oximeter is affordable but when we are going towards more accuracy of data, the price of the oximeter increases with their accuracy.
Thanks for reading. See you soon with another exploration!