# Lab 5 - Paul Gonzales Pag757 BME 343 Lab#5 Fall 2011 1 A...

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Paul Gonzales Pag757 BME 343 Lab #5 Fall 2011 1. A common method for determining oxygen levels in biological tissues is to use oxygen sensitive dyes. These dyes are phosphorescent dyes that emit red light when excited by green light. When a short pulse of green excitation light (ie, δ(t)) hits the dye, the phosphorescence output is h ( t )=e -t/τ u(t), where τ is the decay time of the output. By measuring h(t) and calculating τ from the measured h(t), oxygen levels in the vicinity of the dye can be calculated from τ. (τ is inversely related to oxygen levels, but the exact relationship is not important for this problem). a. Plot h(t) for τ = 25, 50, 100 and 150 µs 0 20 40 60 80 100 120 140 160 180 200 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 t in microseconds h(t) Phosphorescence tau=25 tau=50 tau=100 tau=150 %Lab 5 %Part A clear all ; clc; t = 0:0.01:200; h_25 = exp(-t./25);h_25(t<0)=0; h_50 = exp(-t./50);h_50(t<0)=0; h_100 = exp(-t./100);h_100(t<0)=0; h_150 = exp(-t./150);h_150(t<0)=0;

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## This note was uploaded on 12/14/2011 for the course BME 343 taught by Professor Emelianov during the Spring '09 term at University of Texas.

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Lab 5 - Paul Gonzales Pag757 BME 343 Lab#5 Fall 2011 1 A...

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