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MEDICAL INSTRUMENTATION. Fourth Homework

MEDICAL INSTRUMENTATION. Fourth Homework. 동서의료공학과 2005200444 정 진 웅. 1. Electromagnetic spectrum. ① Audio frequency 20 ~ 20,000 Hz. speed of light (c=3 x 10 8 m/s). frequency. wave length. 10,000 km. ② Radio frequency. 2-1. Low frequency : 30 kHz → 300 kHz

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MEDICAL INSTRUMENTATION. Fourth Homework

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

  2. 1. Electromagnetic spectrum ① Audio frequency 20 ~ 20,000 Hz speed of light (c=3 x 10 8 m/s) frequency wave length 10,000 km

  3. ② Radio frequency 2-1. Low frequency : 30 kHz → 300 kHz (10km) (1km) 2-2. Medium frequency : 300 kHz → 3MHz (1km) (100m) 2-3. High frequency : 3MHz → 30MHz (100m) (10m) “Blue words means that wavelength”

  4. 2. Electromagnetic system 2-4. Very high frequency : 30MHz ~ 300MHz (VHF) (10m) (1m) 2-5. Ultra high frequency : 300MHz ~ 3GHz (UHF) (1m) (0.1m) ※ length of antenna =λ/2

  5. 3. Micro wave 3-1. Centimeter wave : 3GHz→ 30GHz (10cm) (1cm) 3-2. Millimeter wave: 30GHz → 300GHz (10mm) (1mm) 3-3. Sub-millimeter wave: 300GHz → 3THz (1mm) (0.1mm)

  6. 4. Infrared 4-1. Fan infrared : 10-4m ~ 10-6m (100μm) (10μm) 4-2. Intermediate infrared : 10μm ~ 1μm 5. Visible light = ‘ ‘ ~ nm longest wavelength Range of a visible ray shortest wavelength

  7. 6. Ultra violet 7. x-ray 8. r-ray Plank constant c Energy frequency = h λ

  8. ※ details of infrared If it is not T=0, all of materials emit the electromagnetic wave blue we can see, range of visible ray (λ= ~~nm) red we cannot see, (λ= ~10μm) (candle) with light (candle) without light

  9. ※ A visible ray red has a long length wave Maximum energy absolute temperature Energy violet has a short length wave

  10. ※ Measurement using infrared ADC μP LCD R → V Battery (Thermometer) shutter switch OP-amp LCD infrared IR Sensor (Pyroelectric sensor) which don’t have DC response lens (Infrared thermometer)

  11. ※ pyro electric sensor (ex. Piezoelectric sensor) ( Input ) ( Output ) < Theorem > Resistive, capacitive, inductive, piezoelectric, EM spectrum, radiationthermometer, phase-sensitive demodulation

  12. Chapter. 7

  13. 1. Tonometry constant area = A - describe a principle f = Mg M P P (earth) (earth) The volume is not changed. So, pressure inside a ball is getting higher for a balance force per unit area

  14. LED Air jeet Eye ball Photo sensor Photo diode Photo TR

  15. 2. NIBP Cuff pressure Cuff Attach a stethoscope

  16. ※ Basis of circulation

  17. Measuring with IBP Pa 120mmHg 90mmHg t << arterial pressure >> “NIBP only measure the value of a S.P. and D.P.

  18. thank you!!

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