pulse oximeter simulations

Pulse Oximeter Working Principles Simulation

Interactive Pulse Oximeter — Working Principle

This interactive educational simulation demonstrates how a pulse oximeter measures blood oxygen saturation (SpO₂) using red and infrared light absorption through a fingertip.

Pulse Oximeter Visualization

Pulse Oximeter Controls

Oxygen Saturation (SpO₂)

98%

Heart Rate (BPM)

72 BPM

Red LED Intensity

80%

Infrared LED Intensity

80%

Signal Gain

60%

Noise Level

10%

1) Light Emission

The pulse oximeter emits red light (660 nm) and infrared light (940 nm) through the finger.

2) Hemoglobin Absorption

Oxygenated and deoxygenated hemoglobin absorb red and infrared light differently.

3) Pulsatile Blood Flow

Arterial blood volume changes with each heartbeat, causing pulsatile light absorption.

4) Photodetection

A photodetector measures transmitted light intensity reaching the opposite side of the finger.

5) Signal Processing

The pulse oximeter calculates oxygen saturation (SpO₂) using Beer-Lambert light absorption principles.