Black technology in heart rate monitoring: Xiaomi bracelet 2 seconds kill light version
Xiaomi officially released the Xiaomi bracelet 2, priced at 149 yuan, will be launched on June 7 (next Tuesday) at 10 am.
Compared with the first generation products, the biggest improvement of Xiaomi Bracelet 2 is the addition of OLED display and support for heart rate monitoring. This is the second millet bracelet with heart rate monitoring in addition to the Xiaomi bracelet.
Today, Huami Technology founder and CEO Huang Wang said: Huami has several patent algorithms, using the millet bracelet in the second generation, heart rate measurement only recognizes human flesh, does not recognize air, strap and table. There will be no situation in which many watch bracelets will misdetect the heart rate against the air.
In terms of heart rate recognition, the basic principle of the millet bracelet is still to use the principle of reflection, through the pulsation change of the light transmittance in the blood, converted into an electrical signal, corresponding to the heart rate.
Specifically, when the user's heart beats, more blood will flow through the user's wrist, and the amount of green light absorption will also increase. In the heartbeat gap, blood flow is reduced, resulting in a decrease in green light absorption.
Why do you often see green light? Because in the blood of this red liquid, the absorption rate of green light is the largest, and the judgment of the data is more accurate.
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