The principle of heart rate detection of smart watches and the advantages and disadvantages of different methods

Smart watches, mobile phones, and earphones can all detect heart rate. How many methods are there for heart rate recognition? What are their respective strengths and applications? Which ones have been applied to wearable devices, and how do they compare to applications in the medical field?

The principle of basic measurement: blood oxygen content, saturation measurement is the most measured in the finger, but also in the toes, ears, which is the most common place to measure blood oxygen.

The principle is to use red and infrared light emission, these two are very close, to ensure that they are in the position of the finger is very close, can ensure the accuracy of detection. This is a challenge for sensor technology and LED itself.

The red light and the infrared light work separately. When the red light works, the infrared light is turned off, which can ensure that the work between the red light and the infrared light is very disturbed. The distance is just very close, and the same body structure is guaranteed. The information obtained inside.

When you are pulsating, the oxygen molecules are dropped when you walk through the capillaries. Back here is the reduced hemoglobin. Therefore, when detecting, both red and infrared light are a kind of light. On the one hand, it will be attenuated by the tissue structure, and then it will be attenuated by venous blood, and the arteries will be attenuated. The artery has two parts, some of which are stocks. It is inside, due to the pulsation of the heart, there is a part of the pulsating hemoglobin, hemoglobin will increase.

Because of the heartbeat, it is pulsating, and the intensity of light transmitted through the finger will constantly change.

In this way, the heart rate can be detected by a certain algorithm, and of course, the processing of the LED noise is critical.

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