Transcript Infrared Radiation - nnhschen / FrontPage

Infrared Waves
Milena and Audrey
Infrared waves are in between microwaves and visible light on the
electromagnetic spectrum.
They have a frequency between 3x10^11 Hz and 4.3x10^14 Hz.
Their range of wavelength is between 7.3x10^-7 m and .001 m.
How are
infrared used?
waves
•Ever seen and infrared map on
the weather?
Weather satellites use infrared
imaging systems to map cloud
patterns and warm/cold fronts so
that they can predict the weather.
• Astronomers use infrared
telescopes to dust bands,
stars, and entire galaxies that
are unable to be seen with
visible light.
Where a formation is
obscured by dust (blocking
visible light), infrared waves
can still pass through and be
“seen” by the telescope.
How are
infrared used?
waves
• In restaurants, infrared lights are
used to keep food warm while it
waits to be served.
Infrared lamps are also used as
heaters at places such as
sidewalk cafes, where a
traditional heating system would
be impractical.
• Infrared radiation is extremely
useful to the military, who use it to
“see” in the dark, by using the
infrared waves to create a heat
map that shows where warm areas
– such as human bodies – are in a
colder background.
• Thermographs are infrared pictures
that doctors use to see the human
body. The infrared waves can show
the heat distribution throughout the
body, which can show where there are
areas of high or low blood flow.
Who can
see it?
Humans can’t see infrared light. However, humans are continuously
emitting infrared radiation!
Some animals, such as the pit
viper, can see infrared light, and
use it to hunt in the dark.
Machines can “see” infrared
light by measuring the
amount of radiation from
different parts of an object
and displaying it as a heat
map.
Is it
Dangerous?
No!
the only danger that can come from infrared
radiation is simple: overheating.
How
was it
discovered?
In 1800, the German astronomer
William Herschel used a prism
to split white light into the visible
light spectrum (a rainbow).
He then passed a thermometer
through the spectrum, from violet to
red, to measure the temperature
change in the colors. Then he passed
it past the red end of the spectrum,
where he measured the greatest
increase in temperature.
He concluded that there must be an invisible type of radiation past the red
end of the spectrum: infrared!
Interesting
Facts
The longer wavelengths of infrared radiation are what contribute to the
greenhouse effect.
Visible light waves pass through the layer of atmosphere of the earth,
heating it up. Some of the waves are reflected back, but long wavelength
infrared waves can’t pass back through, and so stay beneath the
atmosphere, heating up the Earth.
The longer wavelengths of infrared light
also are much hotter than the shorter
wavelengths. Long wavelengths are
forms of heat such as fire and sunlight,
while the shorter wavelengths are used
in everyday life.
Interesting
Facts
Anything whose temperature is above absolute zero —
0˚ K — radiates in the infrared. That means everything in
the world radiates some measure of infrared radiation!
When something is “red hot”, it’s
giving off so much infrared
radiation that the object glows red
(in the visible spectrum).
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