About this document
Photoplethysmogram Measurement Guide by qausarinarisa is a document available to read on EtoBox.
This document describes an experiment to measure vessel volume changes using a photoplethysmogram. It includes: 1) A block diagram of the circuit used, including an infrared photocoupler to detect volume changes in finger capillaries and generate a pulse waveform. 2) Details of the infrared photocoupler, high-pass filter, gain amplifier, and 4th-order low-pass filter components of the circuit and their purposes. 3) Equations for calculating properties of the high-pass filter and gain amplifier.
- Author
- qausarinarisa
- Language
- EN