This document discusses infrared technology and its applications. It describes how infrared uses electromagnetic radiation with wavelengths longer than those of visible light. It also explains different infrared data transmission techniques like directed beam, omnidirectional, and diffused transmission. The document discusses how infrared is used for wireless communication in local networks and protocols like IrDA. It provides examples of infrared applications in keyboards, scanning documents, and mobile devices. Finally, it outlines some advantages and disadvantages of infrared technology.

2. Contents
 Introduction
 Wireless Communication
 IR Data Transmission Techniques
 Infrared Data Association
 Projection Keyboard
 Google to Use Infrared system to Scan
 Applications
 Advantages and Disadvantages

3. Introduction
 Electromagnetic radiation
 Higher frequency
 wavelength
 Invisible light

4. Sub-Division Scheme
 Near-infrared
 Short-wavelength infrared
 Mid-wavelength infrared
 Long-wavelength infrared
 Far infrared

5. Wireless Communication
 Short-range wireless communication.
 Line of sight communication.
 Data transmission bidirectionally.
 Computer infrared network adapters both transmit
and receive data through ports on a device.

6. Wireless Communication

7. Wireless Communication
Infrared technology used in local networks exists in
three different forms:
 1 . IrDA-SIR
 2 . IrDA-MIR
 3 . IrDA-FIR

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

9. IR Data Transmission
Techniques
 Directed Beam Infrared
 Ominidirectional
 Diffused

10. Directed Beam Infrared
 Used to create point-to-point links
 Range depends on emitted power and degree of
focusing
 Focused IR data link can have range of kilometer

11. Directed Beam Infrared - II

12. Omni directional
 Single base station within line of sight of all other stations
on LAN
 Station typically mounted on ceiling
 Base 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

13. Omni directional - II

14. Diffused
 All IR transmitters focused and aimed at a point on
diffusely reflecting ceiling
 IR radiation strikes ceiling
 Reradiated omnidirectionally
 Picked up by all receivers

15. Projection Keyboard
 virtual keyboard
 P-ISM

16. Projection Keyboard(cont.)

17. Infrared Data Association
 communication protocol

18. Infrared Data Association
IrDA via USB IrDA with mobile phone

19. 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.

20. Send and receive files

21. Send and receive pictures

22. Google to Use Infrared system to
Scan
 According 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.

23. Google to Use Infrared system to
Scan

24. Advantages
 Low power requirements
 Simple and Low circuitry costs
 Higher security
 Portable
 High noise immunity
 No license required

25. Disadvantages
 Line of sight
 Blocked by common materials
 Short range
 Light, weather sensitive

26. Applications
 Night vision equipment
 Thermography
 Infrared photography
 In control remotes
 In mobile phone

27. 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.