1. Medical Instrumentation II

2. Themometer  Infrared thermometer? Medical Instrumentation II T1 = 0 : 0.00001 : 0.0025 T2 = 0.0025 : 0.00001 : 0.005 T3 = 0.005 : 0.00001 : 0.0075 T4 = 0.0075 : 0.00001 : 0.01

3. Electromagnetic spectrum  1. Audio frequency (20 ~ 20,000Hz) If 30Hz ? Medical Instrumentation II 10,000KHz

4. Electro magnetic spectrum  2. Radio frequency 2-1. Low frequency : 30KHz -> 300KHz 2-2. Medium frequency : 300KHz -> 3MHz 2-3. High frequency : 3MHz -> 30MHz Medical Instrumentation II Wave length 10Km -> 1Km Wave length 1Km -> 100m Wave length 100m -> 10m

5. Medical Instrumentation II Antenna V c (t) 10 -10 X = 0 VoVo

6. Electro magnetic system 2-4. Very high frequency : 30MHz ~ 300Mhz (VHF) 2-5. Ultra high frequency : 300MHz ~ 3GHz (UHF) “ Length of antenna = λ / 2” Medical Instrumentation II Wave length 10m -> 1m Wave length 1m -> 0.1m

7. Micro wave  3-1. Centimeter wave : 3GHz ~ 30GHz  3-2. Millimeter wave : 30GHz ~ 300GHz  3-3. Sub millimeter wave : 300GHz ~ 3Thz Medical Instrumentation II Wave length 10Cm -> 1Cm Wave length 10mm -> 1m Wave length 1mm -> 0.1mm

8. Infrared  4-1. Fan infrared : 10¯⁴ ~ 10⁻⁶ m  4-2. Intermediat infrared : 10μm ~ 1μm Medical Instrumentation II Wave length 100μm -> 10 μ m

9. Visible light  Unit : ~ nm Medical Instrumentation II Longest λ Shortest λ

10.  Ultra violet  X – ray  R - ray Medical Instrumentation II energy Plank constant

11. Infrared (detail)  All material generate electric wave.  It’s wavelength is in inverse propotion to temperature. Medical Instrumentation II

12. Red is long wavelength Blue is short wavelength Visible rays Bandwidth Λ 2 ~ 10nm We can not visible in no light Λ 2 ~ 10μm

13. Medical Instrumentation II Absolute temperature EX) Human have 25 ̊C temperature. -> T is about 300K. Maximum energy Energy

14. Ex) CIC thermometer  Radiation thermometer Medical Instrumentation II R -> VADCMPLCD Battery IR Op-amp circuit ADC MP LCD Switch infrared Shutter Lens IR sensor (pyroelectric sensor)

15. Pyroelectric sensor Medical Instrumentation II Infrared Input Infrared Output Resistive, Capacitive, Inductive Sensor and Piezoelectric, EM spectrum, Radiation thermometer, Phase- sensitive demodulation