Pulse oximeter. Original patent Your data Big deep breaths and then hold Damn, I want some air Gave up.

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Presentation transcript:

Pulse oximeter

Original patent

Your data Big deep breaths and then hold Damn, I want some air Gave up

Photodiode detection Photodiode: Current is proportional to amount of light hitting the detector

Detection demo

We will do something else…

Hysteretic oscillator

LED Driver 2.5 V

Background

Background + red Detector sees the sum of the two curves

Background + red + ir Detector sees the sum of the three curves

Convert driving signal to +/- 1

Multiply +/- 1 and detector Blue – bg only Red – bg + red LED Black - bg +red + ir Driving * Detector

Integrate w.r.t time - background

Integrate w.r.t time - bg +red

Integrate w.r.t time - bg +red+ir

Converges to average difference between red and ir We will keep the running integral by using a low-pass filter

Low-passed result

How do we implement a low pass filter in software?

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