Description

Objective:

Light Plethysmograph measures the reflection from or transmission through a capillary bed like the fingertip or ear lobe. It can provide a signal that indicates pulsatile changes of the volume of blood in the capillary bed. This technique consists of a light source and photodetector and can be used to observe heart beat rate or cardiac cycles.

Features:

• Transmittance sensor probe to fit on fingertip
• Sensor consists of Red LED and matching Photodiode
• System includes breadboard and components
• Need external power supply [5V]
• Output signal can be observed using oscilloscope or DAQ system
• The user manual describes the mechanism of this technique with circuit diagrams.