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为什么智能手表能监测血氧？
智能手表能监测血氧主要是因为其光电容积传感器（PPG）、红光与红外光的反射原理以及算法处理。
1、光电容积传感器（PPG）。智能手表内置的光电容积传感器会发出红光和红外光，照射到皮肤表面，检测反射光的变化，从而分析血液中的氧含量。
2、红光与红外光的反射原理。血红蛋白含氧量不同，对红光和红外光的反射率不同。通过测量反射光强度的变化，可以推算出血氧饱和度。
3、算法处理。智能手表内置的算法会根据反射光信号的变化，结合用户的基础数据（如心率、运动状态等），计算出血氧饱和度，并实时显示在设备上。
总结：智能手表能监测血氧，是因为其光电容积传感器（PPG）、红光与红外光的反射原理以及算法处理。
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