EM350 midterm Problem 4

# EM350 midterm Problem 4 - Problem 4 In this problem use of...

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0 1 2 3 4 5 6 7 8 9 10 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 Reference signal time, microseconds Magnitude Problem 4 In this problem use of ultrasonic immersion test is used to find the size of a crack. The signal is the following. a) MATLAB CODE clc; clear; %A_f=i*pi*f*b^2/c; %V_f=L_f*A_f; load 'ref_signal' t syst ; load 'flaw_signal' crack1 ; figure(1); plot(t, syst) title( 'Magnitude Vs. Frequency' ) xlabel( 'frequency ,MHz' ) ylabel( 'Magnitude' )

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0 2 4 6 8 10 12 14 16 18 20 -0.1 -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08 0.1 Reference signal frequency frequency ,MHz Magnitude b) Use Fourier transform to get the frequency component of the system. L(f) MATLAB CODE dt=t(2)-t(1); f=s_space(0,1/dt,1000); L_f=FourierT(syst,dt); figure(2); plot(f,L_f); title( 'Reference signal frequency' ) xlabel( 'frequency ,MHz' ) ylabel( 'Magnitude' ) axis([0 20 -.1 .1])
0 1 2 3 4 5 6 7 8 9 10 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 Crack signal time, microseconds Magnitude c) Load and plot the crack signal MATLAB CODE load

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## This note was uploaded on 03/31/2008 for the course EM 350 taught by Professor Schnuerr during the Spring '08 term at Iowa State.

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EM350 midterm Problem 4 - Problem 4 In this problem use of...

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