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Why infra red light is absorb and red light is reflected in ppg technique? |
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Answer» le of PPG. PPG makes uses of low-intensity INFRARED (IR) LIGHT. When light travels through biological tissues it is absorbed by BONES, skin pigments and both venous and arterial blood. ... Even small changes in blood volume can be detected using thismethod, THOUGH it cannot be used to quantify the amount of blood. |
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