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# 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 µ s %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; 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

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Paul Gonzales Pag757 h_100 = exp(-t./100);h_100(t<0)=0; h_150 = exp(-t./150);h_150(t<0)=0; plot(t,h_25) hold on plot(t,h_50, 'red' ) hold on plot(t,h_100, 'green' ) hold on plot(t,h_150, 'cyan' ) hold on legend( 'tau=25' , 'tau=50' , 'tau=100' ,
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Lab 5 - Paul Gonzales Pag757 BME 343 Lab#5 Fall 2011 1 A...

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