Electromagnetic spectrum Dept. of Biomedical Engineering 2003200449 YOUNHO HONG.

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Presentation transcript:

Electromagnetic spectrum Dept. of Biomedical Engineering YOUNHO HONG

Electromagnetic spectrum (1)Audio frequency : 20Hz ~ 20,000Hz (2) Radio frequency (2-1) Low frequency : 30kHz(10km) ~ 300kHz(1km) (2-2) Medium frequency : 300kHz(1km) ~ 3MHz(100m) (2-3) High frequency : 3MHz(100m) ~ 30MHz(10m) Speed of light frequency Wave length Ex) 30Hz => (Diameter of the earth) Wave length is too long for making differences

Electromagnetic spectrum Vs Vo send off the data through the air. wave length x =0m x =10m t t delayed by this time (1 period)

(2-4) Very high freq.(VHF) : 30MHz(10m) ~ 300MHz(1m) (2-5) Ultra high freq.(UHF) : 300MHz(1m) ~ 3GHz(0.1m) (3) Microwave (3-1) Centimeter wave : 3GHz(10cm) ~ 30GHz(1cm) (3-2) Millimeter wave : 30GHz(10mm) ~ 300GHz(1mm) (3-3) Submillimeter wave : 300GHz ~ 3THz(0.1mm) Electromagnetic spectrum Why is high frequency usually used? - Because of length of antenna These are not very often used because of tech. problem

(4) Infrared (4-1) Far infrared : 100um ~ 10um (4-2) (Intermediate) Infrared : 10um ~ 1um (5) Visible light : ~nm Red (longest λ) ….. Violet (shortest λ) (6) Ultra violet (7) X-ray (8) r-ray Electromagnetic spectrum Plank constant energyfrequency

Electromagnetic spectrum Red.. Yellow Green.. violet λ is longer. freq. is lower. absolute temperature If you know one of them, You can get the other.

Radiation Thermister IR LCDLCD amp ADC MP infrared shutter lens switch pyroelectric sensor IR sensor has no DC response. Resistance of IR is changed while the quantity of infrared changes.

Thank You.