Origin of the Term The name means below red, Latin infra meaning“below”. Red has the longest wavelength. INFRAED=INFRA+RED
HISTORY The infrared radiation was discovered byWilliam Herschel, the astronomer, in theearly 19th century. Herschel published hisresults in 1800 before the Royal Society ofLondon IrDA (Infrared Data Association) was formedin 1993 60 companies met to establish standards forexchanging data between mobile devices.
Infrared Transmission“Infrared transmission refers to energy inthe region of the electromagneticradiation spectrum at wavelength longerthan those of visible light but shorterthan those of radio waves.”
Infrared Technology Infrared technology allows computing devices tocommunicate via short-range wireless signals. With infrared, computers can transfer files andother digital data bidirectionally. Computer infrared network adapters both transmitand receive data through ports on a device.
Range IrDA spans very short distances. Short-range communications (under 5 meter) Within a fairly narrow cone (15 degree minimum,30 degree maximum half angle). Works in direct “Line of Sight”.
PerformanceIrDA-SIR (slow speed)data rates up to 115 KbpsIrDA-MIR (medium speed)data rates up to 1.15 MbpsIrDA-FIR (fast speed)data rates up to 4 MbpsIrDA-VFIR ( very fast speed)data rates up to 16 Mbps
Infrared Layersconstitute the complete InfraredCommunication Protocolfor Data Transfer and Communicationbetween IrDA devicesthese layers combine to form the InfraredCommunication possible in this network
IrLMP (Infrared Link ManagementProtocol)LM-MUX (Link ManagementMultiplexer)lies on top of the IrLAP layer.provides multiple logical channelsallows change of Primary/SecondarydevicesLM-IAS (Link ManagementInformation Access Service)provides a list, where serviceproviders can register their servicesother devices can access theseservices via querying the LM-IAS.
IrCOMM (Infrared CommunicationsProtocol)acts like a serial or parallel porton top of transmission layerfor application integration
IrOBEX (Infrared ObjectExchange)OBEX is optional (Object Exchange)provides the exchange of arbitrary dataobjects (e.g., vCard, vCalendar or evenapplications) between infrared devices
IrLAN (Infrared Local AreaNetwork) the optional IrLAN (Infrared Local Area Network)provides the possibility to connect an infrared deviceto a local area network.MethodsAccessPointPeer toPeerHosted
IrS (IrSimple)enhancing transfer rates 4 – 10timesprovides backward compatibilitywith other IrDA Protocols
IrSS (IrSimpleShot)used by Infrared Camera to transferpictures to PrintersIt has the functionality of TV remotecontrol with transfer rates of up to 16Mbps.
Establishing an InfraredNetworkIn an infrared network two devices are alignedin such a way as to establish a networkconnection which has no wires and other warerequirementsThe only requirement from a connectionstandpoint is that a direct line of sight existsbetween the two devices.
Example: remote control for televisiona remote containsan infraredemitterWhen you pressa button on theremote, it emitspulses of infraredlightThese pulses arereceived by theinfrared receiveron televisiona chip inside theremote causesthe infraredreceiver to flash adifferent patternof invisible lightfor each buttonpressed
Night Vision Infrared is used in night vision equipment whenthere is insufficient visible light to see. Night vision devices operate through a processinvolving the conversion of light photons intoelectrons which are then amplified by a chemicaland electrical process and then converted backinto visible light.
Thermography Infrared radiation can be used to remotelydetermine the temperature of objects .This istermed Thermography . Thermography (thermal imaging) is mainly usedin: USESMilitaryIndustrialCar’s Cameras
Tracking Infrared tracking or infrared homing, refers to apassive missile guidance system which uses theemission from a target of electromagneticradiation in the infrared part of the spectrum totrack it. Missiles which use infrared seeking are oftenreferred to as “heat-seekers”
Heating Infrared radiation can be used as a deliberateheating source. For example it is used to remove ice from thewings of aircraft ( de-icing ). It is also gaining popularity as a safe method ofnatural health care & physiotherapy.
Meteorology Weather satellites equipped with scanningradiometers produce thermal or infrared imageswhich can then enable a trained analyst todetermine cloud heights and types, to calculateland and surface water temperatures, and tolocate ocean surface features.