What is PULSE OXIMETER
Explained in easy manner for understanding of everybody.
In recent times, we have learnt a lot about Oximeters. Things are no doubt it is confusing. So as little as we understand physics, this article has tried to explain easily, what is Pulse Oximeter and how does an Oximeter works. Hopefully after reading this you all will be able to decide for yourself whether it is possible to work with the app on mobile phone or not.
Before talking about Oximeters, would like to discuss a few simple things.
The first is …
- What is wavelength
In the dark of night we see nothing. But those who have night vision glass, can see some shapes in red, blue & green. The reason is our body temperature. An electromagnetic radiation is emitted depending on the temperature of each person’s body. Just as iron turns red when it is heated, this does not mean that nothing came out until it turned red. The light that comes out before it turns red cannot catch our eyes. It is called infrared light. This infrared is a light whose wavelength is greater than that of red light. Thermal gun work in the same way. Tells body temperature from a distance. In other words, the color of the light is determined by the wavelength.
It is written in nanometer units. One nanometer means one tenth of a meter. Our eyes can only catch 400-600 nanometers of light. We cannot see any light outside of it. The image shown in Thermal Song is of wavelength above 800. So it can be seen only with that device. Not with the naked eye.
Purple-blue-sky …. Rainbow V I B G Y O R … Remember? Its purple light wavelength is about 400 nanometers. And Red’s range is around 600. The ones below 400 are called ultraviolet and the ones above 800 are called infrared.
Then it was understood that the matter of wavelength is somehow related to the matter of color.
- What does it do with blood?
In the blood, we know that hemoglobin particles carry oxygen. If hemoglobin is was an automobile, oxygen is its passenger. It travels through veins and arteries throughout the body. This time the lack of oxygen in the blood means that the hemoglobin car is running on the route, but there are no passengers. How is it known? The way is very simple. The answer is that they absorb light of any wavelength. An object that absorbs light of any wavelength is like a fingerprint. That is, if it is seen by sending light, it absorbs light of a certain wavelength Then it can be said what that object is. It is a natural miracle that is exploited by physicists.
So what is the fingerprint of hemoglobin?
Yes, that’s where infrared light comes in. Scientists have found that if hemoglobin contains oxygen, it absorbs more light at a wavelength of 950 nanometers. And if hemoglobin does not have oxygen, it absorbs more light at a wavelength of 750 nanometers. Well, one more thing, if there is oxygen, light of 750 wavelength is less absorbed and if there is no oxygen, it is less than 950.
There is another small matter here, known as scientist Lambert and Beer’s law. That is to say, the higher the concentration, and the greater the absorption of this particular wavelength.
Now what if you combine these two? If I see that my blood is absorbing 950 more than 750 then I have good oxygen. How good? That is what the oximeter calculates.
What is in the oximeter?
The miniature version of what I said in the previous paragraph is the oximeter. It usually has two LEDs, one 650 nanometers and one 950 nanometers wavelength. On the other hand, there is a detector that looks at how low the light level of a wavelength is. And what is between these two?
The tip of your finger. Where the amount of blood is high.
There is also one or more chips to calculate this data to show you what percentage is on the screen.
Is it possible to do this with ordinary mobile phone app?
Yes it is possible. If a phone has separate light sources of 650 Nano and 950 Nano. But it is not in any phone.
The flashlight of the phone is white light. That is, it contains 400-700 light of all wavelengths. V-I-B-G-Y-O-R is white when mixed. There is nothing different. So it is impossible to make an oximeter in this way. If someone makes a claim, then that claim is wrong and the measure is certainly not credible. It is more likely to be the opposite.
Original text and CREDIT TO : ।।পবিত্র দাসের লেখা।।
One can refer to various care instructions for isolation etc
https://www.icmr.gov.in/chomecare.html
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