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  1. 1. INFRARED Presenter : Khizra Samad
  2. 2.  Infrared light is a wavelength of energy that is invisible to the human eye.  The most common source of this energy is heat; objects can have their relative temperatures measured by how much of this energy they give off.  Slightly more than half of the energy from the Sun arrives on Earth in the form of infrared radiation. The balance between absorbed and emitted infrared radiation has a critical effect on Earth's climate.
  3. 3. CONT..  Infrared is electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 700 nanometers (nm) to 1 mm.  This range of wavelengths corresponds to a frequency range of approximately 430 THz down to 300 GHz, and includes most of the thermal radiation emitted by objects near room temperature
  4. 4. HOW INFRARED WORKS  infrared radiation is the region of the electromagnetic spectrum between microwaves and visible light.  In infrared communication an LED transmits the infrared signal as bursts of non-visible light. At the receiving end a photodiode or photoreceptor detects and captures the light pulses, which are then processed to retrieve the information they contain
  5. 5. USES  -  -  - Medicine: Doctors use infrared lamps to treat skin diseases and relieve the pain of sore muscles. Military infrared imaging is used extensively in military for target acquisition, surveillance, wireless communication, night vision, homing and tracking. Science: infrared have allowed buildings to keep cool even in the summer. Gold transparent films in the windows of large office buildings reflect infrared and help to keep temperatures cool.
  6. 6.  - - Consumer Goods: Photographers use film that is sensitive to infrared rays to take pictures in places where there is no visible light. TVs, VCRs and CD players also use infrared. Industry:  Infrared is used extensively in specially-designed ovens for drying painted and enameled surfaces, leather, metals, papers and textiles. 
  7. 7. ADVANTAGES:        Low power requirements: therefore ideal for laptops, telephones, personal digital assistants Low circuitry costs: $2-$5 for the entire coding/decoding circuitry Simple circuitry: no special or proprietary hardware is required, can be incorporated into the integrated circuit of a product Higher security: directionality of the beam helps ensure that data isn't leaked or spilled to nearby devices as it's transmitted Portable Few international regulatory constraints: IrDA (Infrared Data Association) functional devices will ideally be usable by international travelers. High noise immunity: not as likely to have interference from signals from other devices
  8. 8. 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: performance drops off with longer distances  Light, weather sensitive: direct sunlight, rain, fog, dust, pollution can affect transmission  Speed: data rate transmission is lower than typical wired transmission 
  9. 9. REFERENCE m    assroom/ir_tutorial/what_is_ir.html 