Oximeter ambient light cancellation

A - Human Necessities – 61 – B

Patent

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A61B 5/00 (2006.01)

Patent

CA 2556748

A pulse oximeter method and apparatus which provides (1) a notch filter (46) at a distance between a modulation frequency and a common multiple of commonly used power line frequencies (50, 60, 100 and 120) and also (2) a demodulation frequency greater than a highest pulse rate of a person and lower than any harmonic of 50, 60, 100 or 120 Hz, to filter ambient light interference, while choosing an optimum demodulation frequency that avoids interference from the notch filter or from harmonics of the line interference. Also, ambient light for any low frequency interference, such as power line interference, is measured both before and after each of the light emitter wavelengths and the average of the ambient light is then subtracted from the detected signal.

Cette invention concerne un procédé et un dispositif à oxymètre de pouls faisant intervenir (1) un filtre coupe-bande (46) situé à une certaine distance entre une fréquence de modulation et une multiple commun de fréquences de ligne de puissance couramment utilisée (50, 60, 100 et 120), et (2) une fréquence de démodulation (2) supérieure au pouls d'une personne et inférieur à toute harmonique de 50, 60, 100 ou 120 Hz, pour filtrer l'interférence de la lumière ambiante tout en retenant une fréquence de démodulation optimum qui évite les interférence du filtre coupe-bande ou les harmoniques de l'interférence de ligne. Par ailleurs, on mesure la lumière ambiante pour toute interférence basse fréquence avant et après chacune des longueurs d'onde de l'émetteur de lumière, puis on retranche du signal détecté a la lumière ambiante moyenne.

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