Device, system and method for determining at least one vital sign of a subject
A technology of vital signs and objects, applied in application, medical science, diagnosis, etc., can solve problems such as unreliable results and SNR calibration errors
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[0042] Recently, significant improvements in the motion robustness of long-range PPG monitoring techniques have been achieved. The fundamental insight to be able to separate motion-induced signal changes from actual PPG changes is that motion affects all wavelength channels equally (a typical PPG surveillance system uses at least two wavelength channels), i.e., the relative signal strength of motion-induced changes in all channels The same, whereas the PPG-based changes are clearly wavelength-dependent. The wavelength dependence of the PPG signal is mainly due to the wavelength-dependent variation of the absorption contrast between blood and skin. Also, to a lesser extent, it depends on the depth of penetration of light as a function of wavelength and the scattering properties of light in human skin.
[0043] The characteristic wavelength dependence of the PPG signal can be used as a signature, enabling robust PPG measurements. The number of independent distortions that can ...
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