Micro meter = millionth of a meter

1
(No Transcript)
2

• Micro meter millionth of a meter
• Micro meter mm
• Visible light 0.4 mm to 0.7 mm

3
(No Transcript)
4
Radiation Laws As temperature increases
wavelength of maximum radiant intensity, lmax,
increases. Weins Displacemnet Law.
T6000 K
Sun
Earth
T300 K
5
Radiation Laws As temperature increases
wavelength of maximum radiant intensity, lmax,
increases. Weins Displacemnet Law.
Sun
Earth
6
Radiation Laws As temperature increases total
radiation output increases. Stefan_Boltzman
Radiation Law. Brightness Intensity Energy
leaving an object each sec per square meter
As T double Brightness increases by ___??____ As
T triples Brightness increases by _______
7
Radiation Laws As temperature increases total
radiation output increases. Stefan_Boltzman
Radiation Law. Brightness Intensity Energy
leaving an object each sec per square meter
As T double Brightness increases by 16 As T
triples Brightness increases by _____
8
Black Body e1.0
9
The hole acts like a blackbody. All radiant
energy is absorbed none is reflected. If the
inside of the cavity were to become hot then the
hole would glow.
10
(No Transcript)
11
(No Transcript)
12
(No Transcript)
13
No Atmosphere
Solar In
IR out
Surface gets energy only from the sun when there
is no atmosphere
Image modified from http//www.usatoday.com/weath
er/tg/wghwrmng/wghwrmng.htm
14
With an Atmosphere
Surface gets solar energy from the sun and
infrared energy from the atmosphere when there is
an atmosphere.
Image modified from http//www.usatoday.com/weath
er/tg/wghwrmng/wghwrmng.htm