VITAL SIGNS SENSOR AND METHOD OF MEASURING VITAL SIGNS OF A USER

摘要

PPG sensor emits light at at least three wavelengths (Y1-Y3) and detects the reflected light. The PPG sensor comprises a motion correction unit for correcting motion artefacts from the detected light signals by subtracting the output signal of the detected light at the second wavelength (Y2) from an average of an output signal of the detected light at the first and third wavelength (Y1, Y3). The three wavelengths (Y1-Y3) are arranged around 550 nm. The second wavelength (Y2) is arranged equal distantly between the first and third wavelength.

主权项

1. Optical vital signs sensor configured to measure vital signs of a user, comprising:
a light source configured to generate light at at least three wavelengths (Y1-Y3) which is directed towards a skin of the user, wherein the first, second and third wavelengths (Y1-Y3) are arranged approximately around 550 nm, wherein the second wavelength (Y2) is arranged equidistantly between the first and third wavelength (Y1, Y3), at least a photo detector unit configured to detect an intensity of light at the at least three wavelengths, wherein said light is indicative of a reflection of light emitted in or from the skin of the user, and a motion correction unit configured to correct motion artefacts from the light intensity detected by the photo detector by subtracting the light intensity detected at the second wavelength from an average of the light intensity detected at the first wavelength (Y1) and that at the third wavelength (Y3).