TK 2133
DATA COMMUNICATION AND
TELECOMMUNICATION
INFRARED
PREPARED BY:
1)GAN BOON CHONG(A108946)
2)KOAY BEE JUNE(A108508)
3)LOW YEAN LEE(A108840)
INFRARED
Infrared (IR) radiation is electromagnetic radiation
of a wavelength longer than that of visible light,
but shorter than that of microwaves.
Infrared radiation spans three orders of magnitude
and has wavelengths between approximately 750
nm and 1 mm.
“Near infrared" light is closest in wavelength to
visible light and "far infrared" is closer to the
microwave region of the electromagnetic spectrum

Far infrared waves are thermal .

Shorter, near infrared waves are not hot at all in fact you cannot even feel them.

IR wireless cannot pass through walls.
INFRARED DATA TRANSMISSION

Infrared wireless transmitters use light beams at
infrared frequencies to send communication
signals from the transmitter to the receiver.

Infrared transmitters generate strong signals to
prevent interference from other light sources.

The communication systems work well mainly
because of their high bandwidth. These systems
can deliver data at speeds of 10 Mbps to 100
Mbps.

IR wireless is used for short- and mediumrange communications and control.

Some systems operate in line-of-sight mode;
this means that there must be a visually
unobstructed straight line through space
between the transmitter (source) and
receiver (destination).

Other systems operate in diffuse mode
(scatter mode). This type of system can
function when the source and destination
are not directly visible to each other.
ADVANTAGE OF INFRARED
Low
power requirements-ideal for laptops, telephones,
personal digital assistants
Low
circuitry costs: $2-$5 for the entire coding /
decoding circuitry incorporated into the integrated
circuit of a product
Simple
Higher
circuitry: no special hardware is required, can be
security: directionality of the beam helps ensure
that data isn't leaked or spilled to nearby devices as it's
transmitted
High
noise immunity: not as likely to have
interference from signals from other devices
Few
international regulatory constraints: IrDA
(Infrared Data Association) functional devices will
ideally be usable by international travelers, no
matter where they may be
Portable
DISADVANTAGE OF INFRARED
Line
of sight: transmitters and receivers must be
almost directly aligned to communicate (see each
other)
Blocked
by common materials-people, walls,
plants-can block transmission. IR communications
or control is generally not possible between
different rooms in a house, or between different
houses in a neighborhood (unless they have
facing windows).
Light,
weather sensitive-direct sunlight,
rain, fog, dust, pollution can affect
transmission
Speed:
data rate transmission is
lower than typical wired transmission
Short
range: performance drops off with
longer distances
Remote Control
Examples of remote
control:
Television remote
control
Air-conditional remote
control
Car locking system
Infrared Mouse/Keyboard
Infrared in Mobile
Infrared Thermometer
Infrared Astronomy
Infrared Thermography
Infrared in Medical
Thermal scan of loss
of circulation in
fingers due to
Reynauds Disease
Thermal scan showing
inflammation in anterior portion
of knee
Infrared sensors
Infrared Sauna Therapy
Advantages of infrared sauna therapy:
Reduces scaring from wounds or surgery.
Leaves skin smooth and soft.
Improves skin tone and elasticity.
Cleans pores of toxins
Breaks down cellulite fat
Infrared Heat
Application:
Welding of plastic components
Technology:
short wave emitters matching
exactly to the product
automated process, done by
robots
Advantages:
faster welding process
better quality of product
less fumes