동서의료공학과 정 진 웅

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

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”

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

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)

4-1. Fan infrared : m ~ m (100μm) (10μm) 4-2. Intermediate infrared : 10μm ~ 1μm longest wavelength shortest wavelength Range of a visible ray

Energy Plank constant frequency = h λ c

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

red has a long length wave violet has a short length wave Energy Maximum energy absolute temperature

R → V ADCμPμPLCD Battery (Thermometer) OP-ampLCD infrared switch shutter lens IR Sensor (Pyroelectric sensor) which don’t have DC response (Infrared thermometer)

※ pyro electric sensor (ex. Piezoelectric sensor) (ex. Piezoelectric sensor) ( Input ) ( Output ) Resistive, capacitive, inductive, piezoelectric, EM spectrum, radiation thermometer, phase-sensitive demodulation

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

Eye ball LED Photo sensor Photo diode Photo TR Air jeet

Cuff pressure Attach a stethoscope

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