동서의료공학과2005200444 정 진 웅

f

c

① Audio frequency 20 ~ 20,000 Hz

wave length

frequency

speed of light (c=3 x 10 8 m/s)

kmmHz

smHz 000,10101

30

/10330 7

5

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”

)1032sin(10)( 7 ttVC

)(tVC

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 : 10-4m ~ 10-6m (100μm) (10μm)

4-2. Intermediate infrared : 10μm ~ 1μm

longest wavelength

shortest wavelength

Range of a visible ray

hE Energy

Plank constant

frequency = h λ

c

If it is not T=0,

all of materials emit the electromagnetic wave

(candle)with light

red

bluewe 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

1T

mTm 2898

4TWt Energy

Maximum energy

absolutetemperature

R → V ADC μP LCD

Battery

(Thermome(Thermometer)ter)

OP-amp LCD

infrareinfraredd

switchswitchshutteshutterr

lenlenss

IR SensorIR Sensor(Pyroelectric sensor)(Pyroelectric sensor)which don’t have DC responsewhich don’t have DC response(Infrared (Infrared

thermometer)thermometer)

※ ※ pyro electric sensor pyro electric sensor (ex. Piezoelectric sensor)(ex. Piezoelectric sensor)

( Input )( Input ) ( Output ( Output ))

< Theorem >< Theorem >

Resistive, capacitive, inductive, piezoelectric, EM spectrum,radiation thermometer, phase-sensitive demodulation

- describe a principle

(earth)(earth)

P

(earth)(earth)

P

M

constant constant area = Aarea = A

f = Mgf = Mg

The volume is not The volume is not changed.changed.

So, pressure inside a ball So, pressure inside a ball isis

getting higher for a getting higher for a balancebalance

A

FP

force per unit area

Eye ball

LED

Photosensor

Photo diodePhoto TR

Air jeet

PVO

1

Cuff

Cuffpressure

Attach a stethoscope

90mmHg

120mmHg

Pa

t

Measuring with IBP

<< arterial pressure >>““NIBP only measure the value of NIBP only measure the value of

a S.P. and D.P.a S.P. and D.P.