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.