TK 2133DATA COMMUNICATION AND

TELECOMMUNICATION

INFRARED

PREPARED BY:

1)GAN BOON CHONG(A108946)

2)KOAY BEE JUNE(A108508)

3)LOW YEAN LEE(A108840)

INFRAREDInfrared (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 medium-range 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 INFRAREDLow 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 circuitry: no special hardware is required, can be

Higher 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 INFRAREDLine 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 HeatApplication: 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