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Law obeyed by Pulse Oximeter is _______

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Law obeyed by Pulse Oximeter  is _______

(a) Lambert-Bouguer law

(b) Beer ‘s law

(c) Beer-Lambert law

(d) Lamber-Bouguer, Beer’s and Beer-Lambert Law

This question was addressed to me in semester exam.

Query is from Electroencephalograph (EEG) topic in chapter Biomedical Recorders of Biomedical Instrumentation

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The correct answer is (d) Lamber-Bouguer, Beer’s and Beer-Lambert Law

Easy explanation: Light passing through the ear or finger will be absorbed by skin pigments, tissue, cartilage, bone, arterial blood, venous blood. The absorbances are additive and obey the Beer-Lambert law. Beer-Lambert is combination of Lambert-Bouguer and Beer’s Law.

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