Photoplethysmographics using phase-division multiplexing

Details Photoplethysmographics using phase-division multiplexing Photoplethysmographics using phase-division multiplexing

G - Physics

01

N

G01N 21/31 (2006.01) A61B 5/00 (2006.01) A61B 5/02 (2006.01)

Patent

CA 2062270

Photoplethysmographics Using Phase-Division Multiplexing Abstract First and second carrier signals, distinguishable by phase, are respectively applied to infrared and red energy emitters. A detector receives the sum of the energy after modulation at the infrared and red wavelengths. The sig- nal received by the detector is then demultiplexed into its original first and second components, thereby allowing determining of both the infrared and red modulation compo- nents. The first and second carrier signals may comprise time-varying periodic signals with identical frequency and frequency spectra, such as a pair of sine waves which are indistinguishable except by phase and amplitude. A 90° phase difference is preferred, but any phase other than 0 or an integer multiple of 180° is workable. A carrier frequency which avoids excessive interference from ambient light is preferred.

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