how heart rate sensor works in fitness band

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how heart rate sensor works in fitness band插图

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Almost every fitness tracker comes with an optical heart rate sensor. It鈥檚 job is tocalculate your heart beats per minute. The sensor uses light to check the speed of blood flow on the wrist.

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  • How does the heart rate sensor work?

  • The heart rate sensor sits comfortably within the fitness tracker or smart watch, preferably under the device with a smart light against your skin. When your heart pumps the blood, it moves through your veins at a faster pace, thereby causing less light to be reflected backwards.

  • How do smartwatches and fitness bands measure heart rate?

  • Smartwatches and fitness bands measure heart rate by scanning blood flow near your wrist, by illuminating it with LEDs. The colour green is chosen, because it is absorbed well by our red blood, so optical sensors can gauge the flow of blood and heart beats more accurately.

  • What are the sensors used in a fitness tracker?

  • These sensors are most commonly used in Smart weighing scales to measure your body composition such as the total body fat w.r.t your lean body mass. These days some fitness trackers are also using these sensors to track heart rate, sleep patterns, hydration, respiration rate and even skin galvanization.

  • How does an optical heart rate monitor work?

  • Unlike the EKG a doctor might use to measure your heart rate, an optical heart-rate monitor measures your heart rate using light. An LED shines through the skin, and an optical sensor examines the light that bounces back.

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