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생체의공학과 2010103793 변철 민

Medical Instrumentation #10. 생체의공학과 2010103793 변철 민. Contents. Electromagnetic Spectrum. 1.Audio Frequency. 20 ~ 20,000Hz ( 참고 : 초음파 20,000Hz 이상임 ). 30Hz ( 지구의 직경 ). 300Hz . Electromagnetic Spectrum. Radio Frequency. 4 . Very High Frequency : 30MHz ~ 300MHz

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생체의공학과 2010103793 변철 민

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  1. Medical Instrumentation #10 생체의공학과 2010103793 변철민

  2. Contents

  3. Electromagnetic Spectrum 1.Audio Frequency 20 ~ 20,000Hz (참고:초음파 20,000Hz 이상임) 30Hz (지구의 직경) 300Hz

  4. Electromagnetic Spectrum Radio Frequency 4. Very High Frequency : 30MHz ~ 300MHz (10m) (1m) 1. Low Frequency : 30kHz ~ 300kHz (10km) (1km) 2. Medium Frequency : 300kHz ~ 3MHz (1km) (100m) 5. Ultra High Frequency : 300MHz ~ 3GHz (1m) (0.1m) 3. High Frequency : 3MHz ~ 30MHz (100m) (10m)

  5. Electromagnetic Spectrum Microwave(1GHz이상) 1. Centimeter wave: 3GHz ~ 30GHz (10cm) (1cm) 2. Millimeter wave: 30GHz ~ 300GHz (10mm) (1mm) 3. Submillimeter wave: 300GHz ~ 3THz (1mm) (0.1mm)

  6. Electromagnetic Spectrum Infrared(적외선) 1. Far Infrared(원적외선) : 3THz ~ 30THz m~ m 2. (Intermediate) Infrared (적외선): 1000~ 2eV m~ m plank 상수 =6.626 =h

  7. Electromagnetic Spectrum Visible Light(가시광선) 수 eV , < 1μm 감소, 증가, 증가

  8. Electromagnetic Spectrum Ultra violet(자외선) Gamma- ray (m ~ m) ~ (m ~ m) 수백 keV ~ 수만 MeV m ~ m 수 eV ~ 수백 eV 살균가능 X - ray m ~ (m ~ m) 수백 eV ~ 수백 keV : femtometer

  9. 변조와 복조 Modulation(변조) Demodulation(복조) -Baseband signal , , , , 음성 : 20 ~ 20,000Hz ECG : 0.05 ~ 100Hz EEG : 0.1 ~ 30Hz 0 0 20 20 0 20000 20000 20 20000

  10. 변조와 복조 x carrier x

  11. 변조와 복조

  12. 변조와 복조 Demodulation(복조) LPF x = amp

  13. 변조와 복조 Demodulation(복조) ] ] =>복조의 결과

  14. Thank you!!!!!

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