Infrared Technology

ContentsIntroduction Wireless CommunicationIR Data Transmission TechniquesInfrared Data AssociationProjection KeyboardGoogle to Use Infrared system to ScanApplicationsAdvantages and Disadvantages

IntroductionElectromagnetic radiationHigher frequency wavelengthInvisible light

Sub-Division Scheme

Near-infraredShort-wavelength infraredMid-wavelength infraredLong-wavelength infraredFar infrared

Wireless CommunicationShort-range wireless communication. Line of sight communication.Data transmission bidirectionally.Computer infrared network adapters both

transmit and receive data through ports on a device.

Wireless Communication

Wireless Communication Infrared technology used in local networks

exists in three different forms: 1 . IrDA-SIR 2 . IrDA-MIR 3 . IrDA-FIR

Wireless Communication(cont.)Why we use Infrared System ???

IR Data Transmission TechniquesDirected Beam InfraredOminidirectionalDiffused

Directed Beam Infrared

Used to create point-to-point linksRange depends on emitted power and degree

of focusingFocused IR data link can have range of

kilometer

Directed Beam Infrared - II

Omni directionalSingle base station within line of sight of all other stations

on LANStation typically mounted on ceilingBase station acts as a multiport repeater

Ceiling transmitter broadcasts signal received by IR transceivers

IR transceivers transmit with directional beam aimed at ceiling base unit

Omni directional - II

DiffusedAll IR transmitters focused and aimed at a point on

diffusely reflecting ceilingIR radiation strikes ceiling

Reradiated omnidirectionally Picked up by all receivers

Projection Keyboardvirtual keyboard P-ISM

Projection Keyboard(cont.)

Infrared Data Association communication protocol

Infrared Data Association

IrDA via USB IrDA with mobile phone

Establishing an Infrared Network

Need infrared port for the connectivity.Port will receive and transmit data.Install the infrared adapters.Work in the direct line of sight direction.The speed of connection is very slow.

Send and receive files

Send and receive pictures

Google to Use Infrared system to ScanAccording to the Mountain View-based giant,

Google, it takes too long to scan books in order to take them online.

The main problem behind the older technology of scanning books lies in the fact that the character recognition software requires a neat 2D image of the text.

Google to Use Infrared system to Scan

AdvantagesLow power requirementsSimple and Low circuitry costsHigher securityPortableHigh noise immunityNo license required

DisadvantagesLine of sightBlocked by common materials Short rangeLight, weather sensitive

ApplicationsNight vision equipmentThermographyInfrared photographyIn control remotesIn mobile phone

Future of infrared technology In the future, it is forecast that this

technology will be implemented in copiers, fax machines, overhead projectors, bank ATMs, credit cards, and headsets.