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PHASE-SENSITIVE DEMODULATION 2006200401 Tae-eui, Kim

MEDICAL INSTRUMENTATION II. PHASE-SENSITIVE DEMODULATION 2006200401 Tae-eui, Kim. Phase-sensitive Demodulation. ; 10Hz Sinusoid (Tx = 0.1s). ; High Freq. Signal (Tx = 0.02s). X(t). X(t) c(t). X O. 1. 0.1s. 0.05s. 0.1s. 0.05s. -1. -X O. Phase-sensitive Demodulation.

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PHASE-SENSITIVE DEMODULATION 2006200401 Tae-eui, Kim

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  1. MEDICAL INSTRUMENTATION II PHASE-SENSITIVE DEMODULATION 2006200401 Tae-eui, Kim

  2. Phase-sensitive Demodulation ; 10Hz Sinusoid (Tx = 0.1s) ; High Freq. Signal (Tx = 0.02s) X(t) X(t) c(t) XO 1 0.1s 0.05s 0.1s 0.05s -1 -XO

  3. Phase-sensitive Demodulation < MATLAB CODE > < MATLAB PLOT >

  4. Phase-sensitive Demodulation < MATLAB CODE > < MATLAB PLOT >

  5. Phase-sensitive Demodulation With Freq. 50Hz < MATLAB CODE > < MATLAB PLOT >

  6. Phase-sensitive Demodulation With Freq. 1000Hz < MATLAB CODE > < MATLAB PLOT WITH HIGH MAGNITUDE > < MATLAB PLOT >

  7. Phase-sensitive Demodulation Given x(t) c(t) = y(t), find x(t) X LPF

  8. Phase-sensitive Demodulation After LPF Phase Demodulation

  9. Capacitive Sensor – Problem 9 (a) Metal plate Change of distance A B L ; Capacitive is dependent on changing distance between chest and metal plate

  10. Capacitive Sensor – Problem 9 (b) A B

  11. Capacitive Sensor – Problem 9 (b)

  12. Capacitive Sensor – Problem 9 (c) X LPF

  13. Capacitive Sensor – Problem 10 (a) Air Atmospheric pressure P1 P2 One is increased, The other is decreased At the same amount Chamber How to express by using equation from the sensor in order to analyze it is crucial rigid rigid A B C Diaphragm X1 X2 (when ) A B C Goal is to measure “ “

  14. Capacitive Sensor – Problem 10 (a) A C D AC (Capacitor) B

  15. Capacitive Sensor – Problem 10 (a)

  16. Capacitive Sensor – Problem 10 (a) Something we would like to measure Constant Constant x High Freq.

  17. Capacitive Sensor – Problem 10 (b) Constant Unit less

  18. Capacitive Sensor – Problem 10 (c)

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