Presentation Seminar on

INFRARED TECHNOLOGY Presented by –

Ankit Kumar AEI, 4th year 120070106009

Overview-As next-generation electronic information systems evolve, it is very essential that all people have access to the information available via these systems.-INFRARED technology, holds great potential for accessing variety of list of information resources.-Already infrared is commonly used in remote control of TVs, VCRs and CD players, infrared technology is also being used and developed for remote control of environmental control systems, personal computers, and phones.

Introduction

• In this presentation, an introduction to wireless communication(INFRARED) in general is presented.

• A discussion specific to infrared technology followed with advantages and disadvantages.

• Wireless communication(infrared), as the term implies, allows information to be exchanged between two devices without the use of wire or cable.

• In infrared technology, information is being transmitted and received using electromagnetic energy referred as electromagnetic radiation.

INFRARED

• INFRARED=INFRA+RED• Infra means “below”, infrared comprises of wavelength below red.• The infrared radiation was discovered by William Herschel, the astronomer, in the early 19th century. Infrared is an invisible radiant energy, electromagnetic radiation with longer wavelength than visible light.

Range

• IrDA spans very short distances.• Short-range communication (under 5 meter).• Works in direct “line of sight”.

Infrared transmission

• “Infrared transmission refers to energy in the region of the electromagnetic radiation spectrum at wavelength longer than those of visible light but shorter than those of radio waves”.

Infrared Transmitter

• Infrared transmitter uses an infrared light-emitting diode (LED) or laser diode for transmission.

Infrared Receiver

• Photodiode detects and captures the light pulses which are then processed to retrieve the information they contain.

Infrared Technology

• Infrared technology allows computing devices to communicate via short-range wireless signals.

• With infrared, computers can transfer files and other digital data bidirectionally.

Performance

Application

• Remote control for TV• Smart phones• Printers• Play stations• Image scanners• Home security system

Night Vision

• Infrared is used in night vision equipment when there is insufficient visible light to see.

Thermography

• Infrared radiation can be used to remotely determine the temperature of object.

• Thermography camera detect radiation in infrared range of electromagnetic radiation between 0.9-14μm.

Advantages

• Low power requirement: therefore ideal for laptops, telephones, personal digital assistants.

• Simple circuitry: no special or proprietary hardware is required, can be incorporated into the integrated circuit of a product.

• Low circuitry cost (for the entire coding/decoding circuitry).• Higher security: directionality of the beam helps ensure that

data isn't leaked to nearby devices.• High noise immunity: not as likely to have interference from

signals from other devices.• Portable.

Disadvantages

• Line of sight: transmitters and receivers must be almost directly aligned (i.e. able to see each other) to communicate.

• Blocked by common materials: people, walls, plants, etc. can block transmission.

• Short range.• Light, weather sensitive: direct sunlight, rain, fog, dust,

pollution can affect transmission.• Speed: data rate transmission is lower than typical wired

transmission.

References

• http://trace.wisc.edu/docs/ir_intro/ir_inro.htm• http://en.m.wikipedia.org/wiki/infrared