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Phase-Sensitive Demodulation Example in Medical Instrumentation

This example demonstrates phase-sensitive demodulation using MATLAB for medical instrumentation. It includes MATLAB source code and diagrams.

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Phase-Sensitive Demodulation Example in Medical Instrumentation

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  1. MEDICAL INSTRUMENTATION.Second Homework 동서의료공학과 2005200444 정 진 웅

  2. 1. Phase-sensitive Demodulation Example1. e X

  3. Matlab sourse of example1. >> t1=0:0.001:0.1; >> x_0=2; >> y1=x_0*sin(2*pi*10*t1); >> y2=sin(2*pi*50*t1); >> y3=y1.*y2; >> plot(t1,y1); >> plot(t1,y2); >> plot(t1,y3);

  4. Example2. X

  5. Matlab sourse of example2. >> t2=0:0.0001:0.1; >> y4=x_0*sin(2*pi*10*t2); >> y5=sin(2*pi*1000*t2); >> y6=y4.*y5; >> plot(t2,y4); >> plot(t2,y5); >> plot(t2,y6);

  6. ? Diagram of demodulation If y(t) = x(t) * c2(t)= x(t) * sin2(2π*fct) 2sin2(2π*fct) = 1-cos(4π*fct) So, sin2(2π*fct)=1/2(1-cos(4π*fct) ) y(t) = x(t) * c2(t)= x(t) * 1/2(1-cos(2π*fct) ) = 1/2x(t) - x*1/2*cos(2π*fct) = 0

  7. 2. Capacitive Sensor (a) step1 chest Applied HR=60bpm → f=1Hz

  8. (b) step2 Analyzing this circuit, On next slide, try sketch the Vo(t) using matlab

  9. (c) step3

  10. 3. Problem 10 P1 P2 sol) rigid rigid x1 x2 when P1=P2,, C1 = C2 diaphragm C A B C1 C2 our goal is to measure ‘|P1– P2|’

  11. sol)

  12. constant constant

  13. LPF 10Hz

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