Pandipedia entry
What light wavelength range do most SpO2 sensors utilize?
Most pulse oximeters utilize two distinct light wavelengths: a red light at approximately 660 nm and a near-infrared light at approximately 940 nm [1][2][3]. These two specific wavelengths are chosen because oxygenated hemoglobin and deoxygenated hemoglobin absorb red and infrared light differently [4], and the pair effectively straddles the hemoglobin isosbestic point near 810 nm [5]. This dual-wavelength setup allows the device to compute arterial oxygen saturation through a ratio of ratios [6].
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