Method for ambient light subtraction in a photoplethysmographic

Details Method for ambient light subtraction in a photoplethysmographic Method for ambient light subtraction in a photoplethysmographic

1997-03-24

1999-09-21

Peffley, Michael

Surgery

Diagnostic testing

Measuring or detecting nonradioactive constituent of body...

600336, A61B 500

Patent

active

059546441

ABSTRACT:
An improved photoplethysmographic measurement system is disclosed in which a portion of a time division multiplexed (TDM) signal represents an ambient light level, and other TDM signal portions represent detected levels of two or more centered wavelengths of transmitted light. The ambient and detected light portions of the signal are simultaneously applied to the inputs of an instrumentation amplifier(s) so as to produce a continuous output voltage that is proportional to a difference in voltage between the ambient and detected light portions of a TDM signal. Such an approach provides for ambient light level subtraction with reduced noise and componentry.

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