Medical Instrumentation Ⅱ 동서의료공학과 2005200431 이건우 -Electromagnetic Spectrum-

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MEDICAL INSTRUMENTATION

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Presentation transcript:

Medical Instrumentation Ⅱ 동서의료공학과 이건우 -Electromagnetic Spectrum-

Frequency : 20 ~ 20,000Hz ▶ Audio frequency ← speed of frequency ← frequency 30Hz : “there is no change in amplitude because it is too long.”

▶ Radio frequency λ = 1km ~ 10km Low frequency f: 30kHz ~ 300kHz, Medium frequency f: 300kHz ~ 3MHz, λ = 100m ~ 1km High frequency f: 3MHz ~ 30MHz, λ = 10m ~ 100m Very high frequency(VHF) f: 30MHz ~ 300MHz, λ = 1m ~ 10m Ultra high frequency(UHF) f: 300MHz ~ 3GHz, λ = 0.1m ~ 1m

▶ Microwave λ = 1cm ~ 10cm Centimeter wave f: 3GHz ~ 30GHz, Millimeter wave f: 30GHz ~ 300GHz, λ = 1mm ~ 10mm Sub millimeter wave f: 300GHz ~ 3THz, λ = 0.1mm ~ 1mm

▶ Infrared Far infrared (Inter mediate) infrared

▶ Visible light Red (longest λ ) Violet (shortest λ )

▶ Ultra violet ▶ X-ray ▶ γ-ray E = h V ↘ energy = h·c/ λ ↓ Plank constant ← frequency

▶ wavelength “inverse proportion of object’s absolute temperature” “VL” increasing λ (T = kelvin temperature)

▶ Radiation Thermometer -Structure of Radiation T hermometer- radiation shutterlens IR sensor OP AMP ACD MP LCD

Thank you for your attention! :D