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1 1 Presentation Transcript

  • Seeing Invisible Things Chapter 1 - Imaging
  • Seeing Invisible Things
    • We will find out:
    • The types of radiation in the electromagnetic spectrum
    • How to use the wave equation in imaging
    • Understand the terms ‘pixel’ and ‘resolution’
  • Electromagnetic Spectrum
    • Contains 7 types of radiation
    • Humans can see visible radiation – detected by eyes
    • Other types of radiation Can be used in imaging, e.g. X-Ray, Infra Red, Gamma.
    But why are they different? Are they similar in any way?
  • Speed, Frequency and Wavelength
    • If
    • Speed = Distance / Time
    • what is the speed of a wave..?
  • Speed, Frequency and Wavelength
    • Wave Speed = Frequency x Wavelength
    • For all electromagnetic waves, speed =
    • 300 000 000 m/s
    • or
    • 3 x 10 8 m/s
  • Distances…
    • Can we use our knowledge of light speed to calculate distances?
    Questions 10S
  • Pixels and Resolution
    • If you look at a digital image closely, you can see:
      • Pixels with different brightness
      • Rows and columns of pixels – the number of these determines the resolution
      • The resolution also determines how much detail you can see